Asian Journal of Aquatic Sciences
type: channel
description: sitemap
publisher: Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau
language: en
publication name: Asian Journal of Aquatic Sciences
issn: 2655-366X
items: INFLUENCE OF BIOMASS Lemna sp. ON THE PHYSICAL PARAMETERS OF PEAT WATER IN THE REARING MEDIUM OF ASIAN REDTAIL CATFISH (Hemibagrus nemurus)
items: EFFECT OF LIQUID ORGANIC FERTILIZER (LOF) FROM CATFISH SOLID WASTE ON PEAT WATER QUALITY PARAMETERS IN THE CULTIVATION OF CLIMBING PERCH (Anabas testudineus)
items: MANAGEMENT STRATEGY FOR PANDAN BEACH MARINE TOURISM, CENTRAL TAPANULI REGENCY, NORTH SUMATRA
items: THE RELATIONSHIP BETWEEN CHLOROPHYLL-α AND TOTAL PHOSPHORUS (TOTAL-P) IN PERUPUK LAKE, PERHENTIAN RAJA SUB-DISTRICT, KAMPAR, RIAU
items: ESTIMATION OF CARBON STORAGE AND ECONOMIC VALUE OF CARBON IN THE MANGROVE FOREST ECOSYSTEM OF BENGKALIS DISTRICT, BENGKALIS REGENCY, INDONESIA
items: ESTIMATION OF CARBON STOCK AND BIOMASS OF MANGROVE IN PANGKAL BABU VILLAGE TANJUNG JABUNG BARAT
items: TOTAL ECONOMIC VALUATION OF THE POLLUTED MANGROVE ECOSYSTEM IN BANDAR BAKAU DUMAI
items: THE POTENTIAL OF BANDOTAN LEAVES (Ageratum conyzoides L.) AS AN IMMUNOSTIMULANT AND ANTIBACTERIAL AGENT IN AQUACULTURE: A REVIEW
items: THE DEVELOPMENT STRATEGY OF THE REGIONAL FISHERY PORT I CAROCOK TARUSAN IN WEST SUMATRA PROVINCE IN IMPLEMENTING THE FUNCTION OF A FISHERY PORT
items: CARAPACE WIDTH-BODY WEIGHT RELATIONSHIP AND CONDITION FACTORS OF Portunus sanguinolentus IN SOUTHEASTERN BONE GULF, SOUTHEAST SULAWESI
items: OPTIMIZATION OF NURSERY TECHNIQUES FOR SILVER POMPANO (Trachinotus blochii) IN BPBL BATAM: ANALYSIS OF GROWTH PERFORMANCE, SURVIVAL RATE, AND WATER QUALITY
items: ASSESSMENT OF WATER QUALITY BASED ON NITRATE, PHOSPHATE, AND AMMONIA CONCENTRATIONS IN BURUK BAKUL VILLAGE, BENGKALIS, RIAU
items: THE ROLE OF THE COMMUNITY IN ENVIRONMENTAL MANAGEMENT IN THE COASTAL AREA OF RUPAT DISTRICT
items: COLLABORATION ON DEVELOPMENT PLANNING POLICY: MITIGATION OF ABRASION PREVENTION IN SIAK REGENCY (CASE STUDY OF MENGKAPAN VILLAGE)
items: THE EFFECTIVENESS OF Cosmos caudatus IN PREVENTING HYPERGLYCEMIA DUE TO Aeromonas hydrophila INFECTION IN Pangasianodon hypophthalmus
items: DIVERSITY OF ECONOMICALLY VALUABLE FISH TYPES IN THE LUBUK LARANGAN AREA, THE BATANG BUNGO RIVER, BUNGO REGENCY, JAMBI
items: CHARACTERISTICS OF TIDES, WAVES, AND BATHYMETRY IN THE WATERS OF BAYUR BAY PADANG CITY, WEST SUMATRA
items: CHARACTERISTICS OF CARAGENAN FROM RED SEAWEED (RHODOPHYTA) Eucheuma spinosum AND Eucheuma cottonii ORIGINATING FROM MORO ISLAND
items: ANTIMICROBIAL POTENTIAL OF MARINE PHOTOSYNTHETIC BACTERIA AND BIOPIGMENT EXTRACTS AGAINST AQUATIC PATHOGENS
items: COMMUNITY STRUCTURE AND CARBON STOCK POTENTIAL OF MANGROVE ECOSYSTEMS IN THE COASTAL AREA OF BANGKO SUBDISTRICT, ROKAN HILIR REGENCY
items: THE EFFECT OF ECO-ENZYME ON BIOMASS PRODUCTION OF Lemna sp. IN GIANT GOURAMI (Osphronemus gouramy) CULTURE SYSTEMS
items: ANALYSIS OF SEDIMENTATION RATES AT THE MOUTH OF THE MESJID RIVER IN DUMAI CITY: IMPLICATIONS FOR SILTATION AND SEDIMENT TRANSPORT
items: EFFECTIVENESS OF REPLACING Artemia sp. FEED WITH FERMENTED PASTE FEED ON THE GROWTH AND SURVIVAL OF STRIPED CATFISH LARVAE (Pangasionodon hypopthalmus) PUSTINA STRAIN
items: HEDONIC TESTING OF MILKFISH COOKIES WITH ADDED MORINGA LEAVES AS COMPLEMENTARY FOOD FOR PREGNANT WOMEN TO PREVENT STUNTING IN NUNUKAN
items: THE EXISTING CONDITION OF THE DRIED SALTED FISH SUPPLY CHAIN IN SIBOLGA CITY, NORTH SUMATRA
items: GROWTH PATTERNS AND GONAD MATURITY LEVELS OF (Barbonymus schwanefeldii) FISH IN THE BATANG ASAI SAROLANGUN RIVER
items: CLIMATE-INFORMED ECOLOGICAL MONITORING OF ZELI LAKE: REMOTE SENSING AND FIELD APPROACHES
items: EFFECT OF Chaetomorpha sp. EXTRACT ON THE HEMATOLOGY OF TILAPIA (Oreochromis niloticus) INFECTED WITH Aeromonas hydrophila
items: POPULATION DYNAMICS OF KAWAKAWA (Euthynnus affinis) LANDED AT PPI UJONG BAROH, WEST ACEH
items: CONTROLLING CANNIBALISM OF ASIAN REDTAIL CATFISH (Hemibagrus nemurus) LARVAE USING PASTE FEED SUPPLEMENTED WITH TURMERIC FLOUR

INFLUENCE OF BIOMASS Lemna sp. ON THE PHYSICAL PARAMETERS OF PEAT WATER IN THE REARING MEDIUM OF ASIAN REDTAIL CATFISH (Hemibagrus nemurus)
type: item
description: Peatland waters hold great potential for aquaculture development; however, their unfavorable characteristics, such as low pH, brownish water color, and high levels of Total Dissolved Solids (TDS) and Total Suspended Solids (TSS), pose major challenges. One approach to improving peat water quality is the use of aquatic plants as phytoremediation agents, such as Lemna sp. This study aims to determine the effect of Lemna sp biomass on the physical parameters of peat water and to identify the optimal biomass for the rearing of Asian redtail catfish (Hemibagrus nemurus). The study was conducted from March to July 2025 at the Integrated Marine Science Laboratory of the Faculty of Fisheries and Marine Sciences at the Universitas Riau. The research method used was an experiment with a one-factor completely randomized design (CRD), consisting of five Lemna sp biomass treatments (0, 25, 37.5, 50, and 62.5 g/m²) and three replicates. The parameters observed included TDS, TSS, turbidity, temperature, pH, water color, absolute weight gain, and survival rate of Asian redtail catfish. The results showed that the addition of Lemna sp biomass significantly improved (P<0.05) the physical parameters of peat water. Increasing the Lemna sp biomass reduced TDS and TSS values and improved water clarity compared to the control without Lemna sp. These improvements in water quality positively affected the absolute weight gain and survival rate of Asian redtail catfish during the rearing period. A Lemna sp. biomass of 62.5 g/m² yielded the best results, with the most optimal physical quality of peat water and the highest growth and survival rates of Asian redtail catfish.
subject: Articles
  topic: section
subject: Lemna sp.
  topic: keywords
subject: peat water
  topic: keywords
subject: physics parameters
  topic: keywords
subject: baungfish
  topic: keywords
subject: phytoremediation
  topic: keywords
creator: Willy Josevin Manihuruk
creator: Saberina Hasibuan
creator: Rodhi Firmansyah
rights: Copyright (c) 2026 Willy Josevin Manihuruk, Saberina Hasibuan, Rodhi Firmansyah (Author) https://creativecommons.org/licenses/by/4.0
date: 2026-04-23
publication date: 2026-04-23
starting page: 53
ending page: 65
doi: 10.31258/ajoas.9.1.53-65

EFFECT OF LIQUID ORGANIC FERTILIZER (LOF) FROM CATFISH SOLID WASTE ON PEAT WATER QUALITY PARAMETERS IN THE CULTIVATION OF CLIMBING PERCH (Anabas testudineus)
type: item
description: Liquid organic fertilizer (LOF) derived from the solid waste of catfish processing is a fermented organic product containing macronutrients such as nitrogen (N), phosphorus (P), and potassium (K), as well as micronutrients, amino acids, and decomposer microorganisms that improve water quality. This study aims to analyze the effects of LOF application on peat water quality and the growth performance of climbing perch (Anabas testudineus), and to determine the optimal dosage for cultivation. The research was conducted from June to July 2025 at the Aquaculture Environmental Quality Laboratory, Faculty of Fisheries and Marine, Universitas Riau, with fish rearing carried out in the hatchery using aquarium. The study employed a Completely Randomized Design (CRD) consisting of five treatments: P0 (0 ml/L), P1 (1.5 ml/L), P2 (2 ml/L), P3 (2.5 ml/L), and P4 (3 ml/L), each with three replications. The results showed that water quality parameters remained within acceptable ranges, with temperature of 28.73–28.9°C, pH of 4.96–5.2, TDS of 108.26–124.6 ppm, transparency of 7.66–9.1 cm, DO of 5.23–5.36 mg/L, alkalinity of 17–28 mg/L, nitrate of 4.0045–8.7292 mg/L, and orthophosphate of 1.5397–3.5454 mg/L. The application of POC increased pH, TDS, nitrate, and orthophosphate concentrations. The best growth performance was observed in treatment P2 (2 ml/L), which produced the highest absolute weight gain (2.15 g) and absolute length growth (2.72 cm), while the survival rate reached 100% across all treatments. Therefore, the P2 dosage is considered the most effective treatment for improving peat water quality and enhancing the growth of climbing perch.
subject: Articles
  topic: section
subject: catfish-waste LOF
  topic: keywords
subject: peat water
  topic: keywords
subject: water quality
  topic: keywords
subject: nutrients
  topic: keywords
subject: climbing perch
  topic: keywords
creator: Rahel Meriani Siringo Ringo
creator: Saberina Hasibuan
creator: Rodhi Firmansyah
rights: Copyright (c) 2026 Rahel Meriani Siringo Ringo, Saberina Hasibuan, Rodhi Firmansyah (Author) https://creativecommons.org/licenses/by/4.0
date: 2026-04-25
publication date: 2026-04-25
starting page: 73
ending page: 81
doi: 10.31258/ajoas.9.1.73-81

MANAGEMENT STRATEGY FOR PANDAN BEACH MARINE TOURISM, CENTRAL TAPANULI REGENCY, NORTH SUMATRA
type: item
description: Pandan Beach is a popular tourist destination in Central Tapanuli Regency. The number of tourists in 2018 was 184,355; in 2019, it decreased to 114,925; in 2020, it decreased to 90,240; in 2021, it increased to 123,905; and in 2022, it decreased to 63,191. This research was conducted at Pandan Beach, Central Tapanuli Regency, North Sumatra Province, in May 2023. This study aims to determine the current conditions and management strategies for Pandan Beach. The method used in this research is the survey method. The sample in this study amounted to 100 respondents. In this study, informants included 3 managers from Pandan Beach, Bappeda, and the Tourism Office, a Village Head, and 2 community leaders. The data obtained were analyzed using descriptive and SWOT analyses. The results of this study indicated that the appropriate management strategy for Pandan Beach is the SO (Strengths-Opportunities) strategy. Utilizing the natural beauty of Pandan Beach to attract tourists to visit, improving the quality and quantity of existing facilities such as toilets, prayer rooms, and others, utilizing government support to support the management of Pandan Beach attractions, involving surrounding communities, such as fishermen, to increase income and increase fishermen's income through boat rental and photo both.
subject: Articles
  topic: section
subject: Management Strategy
  topic: keywords
subject: Marine Tourism
  topic: keywords
subject: SWOT Analysis
  topic: keywords
creator: Ferya Lufika Br Simaremare
creator: Trisla Warningsih
creator: Tomi Ramadona
rights: Copyright (c) 2026 Ferya Lufika Br Simaremare, Trisla Warningsih, Tomi Ramadona (Author) https://creativecommons.org/licenses/by/4.0
date: 2026-04-22
publication date: 2026-04-22
starting page: 45
ending page: 52
doi: 10.31258/ajoas.9.1.45-52

THE RELATIONSHIP BETWEEN CHLOROPHYLL-α AND TOTAL PHOSPHORUS (TOTAL-P) IN PERUPUK LAKE, PERHENTIAN RAJA SUB-DISTRICT, KAMPAR, RIAU
type: item
description: The province of Riau has many freshwater bodies that play a very important role in the lives of those around them. This study aimed to determine the relationship between chlorophyll a and Total-P (Total Phosphorus) concentrations and to assess the trophic status of Perupuk Lake in Perhentian Raja Sub-District, Kampar Regency, Riau Province. The research was conducted from October to December 2024 at three stations: Station 1 (inlet, no settlement), Station 2 (lake main basin with fish cages), and Station 3 (outlet with settlement and agricultural activity). Sampling was performed 5 times at 1-week intervals at the surface and at 2 Secchi depths. Parameters measured included chlorophyll a, Total-P, temperature, transparency (Secchi depth), pH, dissolved oxygen (DO), free carbon dioxide (CO2), and nitrate. Results showed that chlorophyll a concentration ranged from 11.04 to 14.14 µg/L, with the highest at Station 2 (14.14 µg/L) and the lowest at Station 1 (11.04 µg/L). Total-P concentrations ranged from 0.0168–0.0338 mg/L, following the same pattern: highest at Station 3 (0.0338 mg/L) and lowest at Station 1 (0.0168 mg/L). Simple regression analysis showed a non-significant relationship between Total-P and chlorophyll-a (R² = 0.0266–0.0774), indicating that, in mesotrophic waters, other factors, such as light and nitrogen availability, also influence chlorophyll-a concentration. Based on chlorophyll a and Total-P concentrations, Perupuk Lake is categorized as a mesotrophic water body, with supporting parameters within optimal ranges for aquatic organisms.
subject: Articles
  topic: section
subject: chlorophyll-a
  topic: keywords
subject: Total-P
  topic: keywords
subject: mesotrophic
  topic: keywords
subject: oxbow lake
  topic: keywords
subject: water quality
  topic: keywords
creator: Andika Ramadhani
creator: Asmika H. Simarmata
creator: Budijono Budijono
rights: Copyright (c) 2026 Andika Ramadhani, Asmika H. Simarmata, Budijono Budijono (Author) https://creativecommons.org/licenses/by/4.0
date: 2026-04-26
publication date: 2026-04-26
starting page: 82
ending page: 87
doi: 10.31258/ajoas.9.1.82-87

ESTIMATION OF CARBON STORAGE AND ECONOMIC VALUE OF CARBON IN THE MANGROVE FOREST ECOSYSTEM OF BENGKALIS DISTRICT, BENGKALIS REGENCY, INDONESIA
type: item
description: Mangrove ecosystems play a crucial role in climate change mitigation by absorbing and storing carbon in biomass and sediments. This study aimed to estimate biomass carbon stocks, sediment carbon, CO₂ sequestration, and the economic value of mangrove carbon. The research was conducted in May 2025 in Bengkalis District, Bengkalis Regency. A survey method was employed, utilizing data on mangrove species composition, tree density, and diameter at breast height (DBH). The results identified six mangrove species: Rhizophora apiculata, R. mucronata, Avicennia alba, Sonneratia alba, Xylocarpus granatum, and Excoecaria agallocha. The mangrove ecosystem in Bengkalis District exhibited an average aboveground tree carbon stock of 87.75 t ha⁻¹, root carbon stock of 36.77 t ha⁻¹, sediment carbon stock of 54.03 t ha⁻¹, and CO₂ sequestration of 456.97 t ha⁻¹. The estimated economic value of carbon was IDR 388,342,353 ha⁻¹. These findings indicate that the mangrove ecosystem in Bengkalis District has substantial potential as a carbon sink and storage system, highlighting the importance of sustainable management strategies to support climate change mitigation efforts
subject: Articles
  topic: section
subject: Mangrove Ecosystem
  topic: keywords
subject: Carbon Storage
  topic: keywords
subject: Economic Value
  topic: keywords
subject: Bengkalis Regency
  topic: keywords
creator: Silvi Oktaviona
creator: Syafruddin Nasution
creator: Joko Samiaji
rights: Copyright (c) 2026 Silvi Oktaviona, Syafruddin Nasution, Joko Samiaji (Author) https://creativecommons.org/licenses/by/4.0
date: 2026-04-25
publication date: 2026-04-25
starting page: 66
ending page: 72
doi: 10.31258/ajoas.9.1.66-72

ESTIMATION OF CARBON STOCK AND BIOMASS OF MANGROVE IN PANGKAL BABU VILLAGE TANJUNG JABUNG BARAT
type: item
description: Mangrove ecosystems play a critical role as blue carbon sinks, yet quantitative data on carbon stocks in many coastal villages of Jambi Province remain scarce. This study estimated above- and belowground biomass and carbon stocks in the mangrove ecosystem of Pangkal Babu Village, Tungkal Ilir District, Tanjung Jabung Barat Regency, Jambi Province, Indonesia. A non-destructive inventory method was employed across three stations, with a total of eighteen 10 × 10 m sample plots. Tree diameter at breast height (DBH) was measured for all individuals with DBH ≥ 4 cm, and biomass was computed using the generic allometric equation of Komiyama et al. (2005). Six mangrove species were recorded: Sonneratia alba, Avicennia alba, A.marina, Rhizophora apiculata, R. mucronata, and Bruguiera gymnorrhiza, with a total of 246 individual trees. Mean total biomass was 189.29 ± 69.91 Mg/ha and mean carbon stock was 88.96 ± 32.88 Mg C/ha, equivalent to 326.50 ± 120.70 Mg CO₂e/ha. Station 2 exhibited the highest carbon stock (127.88 Mg C/ha), dominated by Avicennia alba with the highest importance value index (IVI = 97.65). These results confirm that the mangrove ecosystem of Pangkal Babu Village serves as a substantial carbon reservoir and should be prioritized for conservation and rehabilitation programs
subject: Articles
  topic: section
subject: Allometric equation
  topic: keywords
subject: blue carbon
  topic: keywords
subject: carbon stock
  topic: keywords
subject: mangrove
  topic: keywords
subject: tanjung jabung barat
  topic: keywords
creator: Ester Restiana Endang Gelis
creator: Septy Heltria
creator: Lauura Hermala Yunita
creator: Rizky Janatul Magwa
creator: Yoppie Wulanda
creator: Farhan Ramdhani
creator: Muhammad Hafidz Ibnu Khaldun
rights: Copyright (c) 2026 Ester Restiana Endang Gelis, Septy Heltria, Lauura Hermala Yunita, Rizky Janatul Magwa, Yoppie Wulanda, Farhan Ramdhani, Muhammad Hafidz Ibnu Khaldun (Author) https://creativecommons.org/licenses/by/4.0
date: 2026-04-22
publication date: 2026-04-22
starting page: 39
ending page: 44
doi: 10.31258/ajoas.9.1.39-44

TOTAL ECONOMIC VALUATION OF THE POLLUTED MANGROVE ECOSYSTEM IN BANDAR BAKAU DUMAI
type: item
description: This study aims to calculate the Total Economic Value (TEV) of the polluted mangrove ecosystem in Bandar Bakau Dumai, Riau Province. Mangrove ecosystems provide important ecological and economic services but face serious threats from pollution from industrial activities, domestic waste, and plastic waste. This study uses the Total Economic Value approach, which includes Direct Use Value (DUV), Indirect Use Value (IUV), and Opportunity Value (OV). Data was collected through surveys, interviews with 14 respondents, and secondary data analysis. The results show that the TEV of the mangrove ecosystem is IDR 468,960,000/year, or approximately IDR 15,128,387/ha/year. The DUV component of IDR 147,700,000 is derived from the utilization of shrimp, kedabu fruit juice, and nyirih leaves. The IUV of IDR 320,000,000 reflects services for coastal protection and the provision of marine biota habitat. Meanwhile, the OV of IDR 1,260,000 indicates the community's willingness to pay for conservation. This value confirms that, despite pollution, mangrove ecosystems continue to provide significant economic benefits and should be prioritized in conservation and sustainable management policies.
subject: Articles
  topic: section
subject: Economic valuation
  topic: keywords
subject: mangrove ecosystems
  topic: keywords
subject: pollution
  topic: keywords
subject: Total Economic Value
  topic: keywords
creator: Fitri Herliza
creator: Trisla Warningsih
creator: Lamun Bathara
rights: Copyright (c) 2026 Fitri Herliza, Trisla Warningsih, Lamun Bathara (Author) https://creativecommons.org/licenses/by/4.0
date: 2026-04-07
publication date: 2026-04-07
starting page: 30
ending page: 38
doi: 10.31258/ajoas.9.1.30-38

THE POTENTIAL OF BANDOTAN LEAVES (Ageratum conyzoides L.) AS AN IMMUNOSTIMULANT AND ANTIBACTERIAL AGENT IN AQUACULTURE: A REVIEW
type: item
description: Aquaculture intensification increases fish susceptibility to infectious diseases, prompting the search for natural alternatives to reduce dependence on synthetic chemicals. Bandotan leaves (Ageratum conyzoides L.) of the Asteraceae family contain secondary metabolites, including flavonoids, alkaloids, terpenoids, and saponins, with antibacterial, antioxidant, and immunomodulatory activities. This literature review aims to analyze the potential of bandotan leaves as a natural immunostimulant and antibacterial agent in aquaculture, focusing on their phytochemical content, mechanism of action, and safety. This study used a literature review method, conducting searches across national and international journal databases, university repositories, and research institute publications. The inclusion criteria included articles discussing the biological aspects, phytochemical content, antibacterial activity, immunomodulatory effects, physiological parameters, histology, and safety of bandotan leaves in the context of aquaculture. The results of the study showed that bandotan leaf extract effectively inhibited the growth of pathogenic bacteria in fish by disrupting cell membrane integrity and inhibiting bacterial enzymes. Its bioactive compounds enhance immune response, antioxidant activity, and reduce metabolic stress in fish. However, its application faces challenges in determining the optimal dosage, assessing histopathological effects, and managing potential respiratory distress at high concentrations. Further research is needed to optimize the formulation, understand the molecular mechanisms, and ensure the long-term safety of bandotan leaf use in sustainable fish farming systems.
subject: Articles
  topic: section
subject: Immunostimulant
  topic: keywords
subject: Aquaculture
  topic: keywords
subject: Secondary Metabolites
  topic: keywords
subject: Fish Health
  topic: keywords
creator: Nur Ikhlas Syuhada
creator: Ronal Kurniawan
creator: Okta Rizal Karsih
creator: M Irsyad Nur
rights: Copyright (c) 2026 Nur Ikhlas Syuhada, Ronal Kurniawan, Okta Rizal Karsih, M Irsyad Nur (Author) https://creativecommons.org/licenses/by/4.0
date: 2026-03-15
publication date: 2026-03-15
starting page: 1
ending page: 8
doi: 10.31258/ajoas.9.1.1-8

THE DEVELOPMENT STRATEGY OF THE REGIONAL FISHERY PORT I CAROCOK TARUSAN IN WEST SUMATRA PROVINCE IN IMPLEMENTING THE FUNCTION OF A FISHERY PORT
type: item
description: This research was conducted in October and November 2022. The research aims to identify problems in the implementation of fisheries port functions in the Regional Fishery Port I Carocok Tarusan and to find solutions in the form of strategies that must be implemented so that the Regional Fishery Port I Carocok Tarusan can apply all fisheries port functions in accordance with Ministerial Regulation No. 08/MEN/2012. The method used is a survey method. The data collected in this research relate to the implementation of fisheries port functions under Ministerial Regulation No. 08 of 2012 at the Regional Fishery Port I Carocok Tarusan. Data analysis was carried out descriptively by examining the conformity of the functions of the Regional Fishery Port I Carocok Tarusan with Ministerial Regulation No. 08 of 2012. Furthermore, a SWOT analysis was conducted to identify strategies to implement so that these functions can be carried out at the Regional Fishery Port I Carocok Tarusan. The results of the study indicate that out of the 9 functions that have been established, only a few functions have been implemented by Regional Fishery Port I Carocok Tarusan, including the function of providing services for mooring and anchoring of fishing boats, the function of fish loading and unloading services, the function of fish marketing and distribution, the function of providing logistics and supplies for fishing vessels, the function of marine tourism, and the function of providing and/or other services in accordance with the applicable laws and regulations. The results of the SWOT analysis show that the position of Regional Fishery Port I Carocok Tarusan is in quadrant III; therefore, a turnaround W-O (Weaknesses-Opportunities) strategy is needed to minimize weaknesses and take advantage of opportunities
subject: Articles
  topic: section
subject: Port Functions
  topic: keywords
subject: Regional Fishery Port I Carocok Tarusan
  topic: keywords
subject: SWOT
  topic: keywords
creator: Putri Wangi Tri Rumelia
creator: Jonny Zain
creator: Polaris Nasution
rights: Copyright (c) 2025 Putri Wangi Tri Rumelia, Jonny Zain, Polaris Nasution (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 484
ending page: 493
doi: 10.31258/ajoas.8.3.484-493

CARAPACE WIDTH-BODY WEIGHT RELATIONSHIP AND CONDITION FACTORS OF Portunus sanguinolentus IN SOUTHEASTERN BONE GULF, SOUTHEAST SULAWESI
type: item
description: This study aimed to determine the body size, carapace width-weight relationship, and condition factors of Portunus sanguinolentus in southeastern Bone Gulf, Southeast Sulawesi. Samples of P. sanguinolentus were obtained from crab fishermen and were collected monthly. The measured data consisted of carapace width and body weight, stratified by sex. The Mann-Whitney test was used to assess differences in body size between males and females. The carapace width-body weight relationship was analyzed using nonlinear and linear regression analysis, and a t-test was performed on the value of b = 3 to determine the growth pattern of the crab. The condition factor analyzed was the relative condition factor. The results showed that male P. sanguinolentus had a larger body size than females. The carapace width-body weight relationship of male, female, and pooled P. sanguinolentus showed a strong and positive correlation, and the growth pattern was negative allometric. The relative condition factor of males was higher than that of females. The results of this study can be used as a basis for managing P. sanguinolentus in the southeastern Bone Gulf.
subject: Articles
  topic: section
subject: Body size
  topic: keywords
subject: Bone gulf
  topic: keywords
subject: Condition factor
  topic: keywords
subject: Growth patterns
  topic: keywords
subject: Portunus sanguinolentus
  topic: keywords
creator: Abdul Hamid
creator: Syamsul Kamri
rights: Copyright (c) 2026 Abdul Hamid, Syamsul Kamri (Author) https://creativecommons.org/licenses/by/4.0
date: 2026-04-06
publication date: 2026-04-06
starting page: 9
ending page: 17
doi: 10.31258/ajoas.9.1.9-17

OPTIMIZATION OF NURSERY TECHNIQUES FOR SILVER POMPANO (Trachinotus blochii) IN BPBL BATAM: ANALYSIS OF GROWTH PERFORMANCE, SURVIVAL RATE, AND WATER QUALITY
type: item
description: The production of silver pompano (Trachinotus blochii) in Indonesia has declined sharply, highlighting persistent issues in its nursery stage, particularly the inability to promote rapid growth and high survival rates when water quality fluctuates. This research assessed intensive nursery techniques implemented at Balai Perikanan Budidaya Laut (BPBL) in Batam by systematically testing different stocking densities, feeding schedules, and key water-quality metrics. Over a twenty-one-day culture cycle, observers collected data daily and interpreted it using descriptive statistics. Fish length rose from an initial mean of 2.50 cm to 3.73 cm, and mean weight climbed from 0.50 g to 1.30 g, yielding an average specific growth rate of 2.5% per day, a survival rate of 83.7%, and a feed-conversion ratio of 2.1. During the trial, temperature (27.6 °C), pH (7.81), dissolved oxygen (5.7 mg/L), and salinity (30 ppt) consistently fell within national SNI 7901-2013 standards. Most deaths occurred during grading rather than through cannibalism, indicating that handling stress, rather than predatory behavior, was the primary cause of loss. Collectively, these results establish a reference point for nursery management of T. blochii and furnish Indonesian aquaculture planners with data needed to boost fish-seed output while strengthening coastal community livelihoods
subject: Articles
  topic: section
subject: Silver Pompano
  topic: keywords
subject: Nursery Techniques
  topic: keywords
subject: Growth Performance
  topic: keywords
subject: Survival Rate
  topic: keywords
creator: Imanda Khalidah
creator: Indra Lesmana
creator: Rodhi Firmansyah
rights: Copyright (c) 2025 Imanda Khalidah, Indra Lesmana, Rodhi Firmansyah (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 419
ending page: 426
doi: 10.31258/ajoas.8.3.419-426

ASSESSMENT OF WATER QUALITY BASED ON NITRATE, PHOSPHATE, AND AMMONIA CONCENTRATIONS IN BURUK BAKUL VILLAGE, BENGKALIS, RIAU
type: item
description: Coastal ecosystems are highly sensitive to nutrient enrichment, particularly from land-based activities and aquaculture effluents, which contribute to water quality degradation. This study evaluated the concentrations of nitrate, ammonia, and phosphate in the coastal waters of Buruk Bakul Village, Bengkalis, Riau Province, Indonesia. Water samples were collected from four representative stations in August 2025: a river estuary, a shrimp pond, a mangrove rehabilitation site, and a natural mangrove forest. The analysis was conducted using spectrophotometric methods in accordance with the Indonesian National Standards (SNI). Results indicated that nitrate concentrations ranged from 0.0822 to 0.1932 mg/L, ammonia from 0.5705 to 1.7338 mg/L, and phosphate from 0.0845 to 0.299 mg/L. All parameters exceeded the seawater quality standards for marine biota established by the Decree of the Minister of Environment No. 51/2004, indicating a significant anthropogenic influence. The river estuary recorded the highest nitrate and phosphate levels, reflecting inputs from land runoff and domestic waste, while ammonia peaked in the shrimp pond due to aquaculture discharge. Nutrient levels in mangrove-associated stations were lower but still above the threshold, indicating that mangrove ecosystems provide some capacity to retain and transform nutrients, although insufficient for full remediation. Elevated nutrient concentrations pose ecological risks, such as eutrophication and algal blooms, which may disrupt biodiversity and fisheries productivity. This study emphasizes the urgency of improving aquaculture waste management, reducing land-derived nutrient loading, and strengthening mangrove conservation and rehabilitation as integrated strategies to sustain coastal ecosystem health in Buruk Bakul and similar regions. These findings provide a baseline for nutrient management and coastal rehabilitation strategies in western Indonesian waters
subject: Articles
  topic: section
subject: Water Quality
  topic: keywords
subject: Buruk Bakul
  topic: keywords
subject: Coastal Ecosystem
  topic: keywords
creator: Sefni Hendris
creator: Dessy Yoswaty
creator: Irvina Nurrachmi
creator: Nabila Afifah Azuga
creator: Bella Billiant J Ananta Kambaren
creator: Rianti Putri
creator: Ardi Gustri Purbata
rights: Copyright (c) 2025 Sefni Hendris, Dessy Yoswaty, Irvina Nurrachmi, Nabila Afifah Azuga, Bella Billiant J Ananta Kambaren, Rianti Putri, Ardi Gustri Purbata (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 391
ending page: 397
doi: 10.31258/ajoas.8.3.391-397

THE ROLE OF THE COMMUNITY IN ENVIRONMENTAL MANAGEMENT IN THE COASTAL AREA OF RUPAT DISTRICT
type: item
description: Coastal environmental problems in Rupat District cannot be resolved solely through a top-down approach or government intervention. This study was conducted in 2025 with the intention of comprehensively analyzing the role of the community in environmental management in the coastal areas of Rupat District, particularly on Ketapang and Lancah beaches. Through a systematic research approach, this study aims to identify the forms of community roles in coastal environmental management efforts, analyze factors that influence the level of community participation, describe the various challenges faced in implementing community-based environmental management, and formulate strategies for strengthening community roles that can be implemented sustainably. The method used in this study was a survey method with a total of 31 respondents, consisting of fishermen, seaweed farmers, fish traders, community leaders, and people involved in marine tourism activities. The results of the study can be concluded that community-based coastal environmental management has enormous potential but faces complex structural challenges
subject: Articles
  topic: section
subject: Environmental Management
  topic: keywords
subject: Community Role
  topic: keywords
subject: Coastal Areas
  topic: keywords
creator: Lamun Bathara
creator: Syahril Nedi
creator: Irwan Effendi
creator: Musyirna Rahmah NST
creator: Tio Afandi Nasution
creator: Afrizal Tanjung
rights: Copyright (c) 2025 Lamun Bathara, Syahril Nedi, Irwan Effendi, Musyirna Rahmah NST, Tio Afandi Nasution, Afrizal Tanjung, Afrizal Tanjung (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 364
ending page: 372
doi: 10.31258/ajoas.8.3.364-372

COLLABORATION ON DEVELOPMENT PLANNING POLICY: MITIGATION OF ABRASION PREVENTION IN SIAK REGENCY (CASE STUDY OF MENGKAPAN VILLAGE)
type: item
description: Siak Regency, located in Riau Province, is one of the areas facing a serious threat of abrasion, especially in coastal areas bordering the Lalang Strait. Mengkapan Village, one of the coastal villages in Siak Regency, has been significantly affected by abrasion. Based on initial observations, the abrasion rate in this area is 2-5 m per year, which poses a threat. Development planning policies play a crucial role in addressing the abrasion phenomenon in Mengkapan Village, Siak Regency, Riau Province. With good planning, development will align with community expectations. Based on satellite imagery analyses in 2020 and 2025, Mengkapan Village experienced abrasion at a rate of 6.43 m/year. Development planning policies in coastal abrasion mitigation must be an integral part of a sustainable regional development strategy. Through a combination of structural, non-structural, and collaborative approaches, along with strong policy support, coastal abrasion can be minimized. Synergy among the government, community, business world, and academia are key to realizing a resilient, productive, and sustainable coastline for future generations.
subject: Articles
  topic: section
subject: Abrasion
  topic: keywords
subject: Changes in the Coastline
  topic: keywords
subject: Policy
  topic: keywords
subject: Coast
  topic: keywords
creator: Ali Asfar
creator: Indra Suandy
creator: Yusri Yusri
creator: Agus Mandar
creator: Maellynia Mustofa
rights: Copyright (c) 2025 Ali Asfar, Indra Suandy, Yusri Yusri, Agus Mandar, Maellynia Mustofa (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 469
ending page: 477
doi: 10.31258/ajoas.8.3.469-477

THE EFFECTIVENESS OF Cosmos caudatus IN PREVENTING HYPERGLYCEMIA DUE TO Aeromonas hydrophila INFECTION IN Pangasianodon hypophthalmus
type: item
description: Cosmos caudatus is a herb that benefits overall health. This study aimed to determine the effect of C. caudatus leaf supplementation in feed on blood glucose levels in catfish (Pangasianodon hypophthalmus) challenged with Aeromonas hydrophila. This study was conducted from March to August 2024 at the Marine Microbiology Laboratory, Faculty of Fisheries and Marine Sciences, Universitas Riau. The method used was an experimental design employing a completely randomized design (CRD) with four treatments and three replications: negative control (NC, no supplementation, no infection), positive control (PC, no supplementation, with A. hydrophila bacterial infection), supplementation with C. caudatus at doses of 10 g/kg (T1), 15 g/kg (T2), and 20 g/kg (T3) of feed, all tested against A. hydrophila. The fish fry used weighed 5.00 ± 1.00 g and were reared for 75 days in 100-L tanks integrated with an aquaponics system. The fish were fed the experimental feed for 60 days before challenge with A. hydrophila bacteria (10⁸ CFU/mL, intramuscular injection) and continued for 14 days after challenge. Blood glucose levels were measured at the beginning (day 1), day 30, pre-challenge (day 60), and post-challenge (day 75). The results showed that adding basil leaves to the feed affected blood glucose (P<0.05). The addition of C. Caudatus leaves maintained glucose homeostasis within the range of 68.33±10.59-79.67±7.77 mg/dL. These findings indicate that C. Caudatus supplementation effectively prevents hyperglycemia caused by A. hydrohila infection in striped catfish and suggest its potential as a natural immunostimulant and metabolic modulator in aquaculture
subject: Articles
  topic: section
subject: Ulam raja
  topic: keywords
subject: Striped catfish
  topic: keywords
subject: Hyperglycemia
  topic: keywords
subject: Motile Aeromonas septicemia
  topic: keywords
creator: Ronal Kurniawan
creator: Windarti Windarti
creator: Irwan Effendi
creator: Asmika Harnalin Simarmata
creator: Efawani Efawani
creator: Rodhi Firmansyah
creator: Nur Ikhlas Syuhada
creator: Okta Rizal Karsih
rights: Copyright (c) 2025 Ronal Kurniawan, Windarti Windarti, Irwan Effendi, Asmika Harnalin Simarmata, Efawani Efawani, Rodhi Firmansyah, Nur Ikhlas Syuhada, Okta Rizal Karsih (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-21
publication date: 2025-12-21
starting page: 319
ending page: 326
doi: 10.31258/ajoas.8.3.319-326

DIVERSITY OF ECONOMICALLY VALUABLE FISH TYPES IN THE LUBUK LARANGAN AREA, THE BATANG BUNGO RIVER, BUNGO REGENCY, JAMBI
type: item
description: The diversity of economically valuable fish species in the Batang Bungo River is crucial for assessing the condition and population, which is the foundation for sustainable capture fisheries in the future. The research aims to identify the economic value of the Batang Bungo River and the diversity, dominance, and relative abundance of economically valuable fish. The research method involved a survey, and data were collected using a purposive sampling technique based on various environmental characteristics and fishing areas commonly used by local fishermen. These fishermen caught 15 people per station. Eight species of economically valuable fish were found in the Batang Bungo River. The diversity values ​​in the upstream (2,049) and downstream (1,933) sections were categorized as moderate. Dominance Index of upstream (0.13: downstream section: 0.15) (medium). The highest relative abundance was found in seluang (Rasbora argyrotaenia) (relative value: 15,95%) and baung (Mystus nemurus) (relative value: 15,65%).
subject: Articles
  topic: section
subject: Diversity
  topic: keywords
subject: Economic Fish
  topic: keywords
subject: Batang Bungo
  topic: keywords
subject: Jambi
  topic: keywords
creator: Rini Hertati
creator: Safitriani Safitriani
rights: Copyright (c) 2025 Rini Hertati, Safitriani Safitriani (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-11-30
publication date: 2025-11-30
starting page: 478
ending page: 483
doi: 10.31258/ajoas.8.3.478-483

CHARACTERISTICS OF TIDES, WAVES, AND BATHYMETRY IN THE WATERS OF BAYUR BAY PADANG CITY, WEST SUMATRA
type: item
description: This study aims to examine the characteristics of tides, waves, and bathymetry in Bayur Bay, Padang City, West Sumatra. Data collection was conducted in October 2024 through a survey method that included tidal observations for 15 days, wave measurements at three stations for 3 days, and measurements of water quality parameters (temperature, salinity, and brightness). Secondary data were obtained from ECMWF and GEBCO and analyzed using Surfer 13 and ArcGIS. The analysis results show that the tides are of a mixed type, leaning towards double daily with a Formzahl value of 0.51. Wave heights vary between 0.15 and 0.6 m, and validation with ECMWF data yields low RMSE values (0.1263-0.2983), indicating the suitability of the model and field data. The bathymetry of Bayur Bay ranges from 0 to 45 m, with the seabed dominated by fine sand. This information is important as a basis for coastal zone management, shipping, and maritime infrastructure development
subject: Articles
  topic: section
subject: Coastal Oceanography
  topic: keywords
subject: Bayur Bay
  topic: keywords
subject: Bathymetry
  topic: keywords
subject: Waves
  topic: keywords
subject: Tides
  topic: keywords
creator: Rafly Fadiansyah Siregar
creator: Rifardi Rifardi
creator: Efriyeldi Efriyeldi
rights: Copyright (c) 2025 Rafly Fadiansyah Siregar, Rifardi Rifardi, Efriyeldi Efriyeldi (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 440
ending page: 445
doi: 10.31258/ajoas.8.3.440-445

CHARACTERISTICS OF CARAGENAN FROM RED SEAWEED (RHODOPHYTA) Eucheuma spinosum AND Eucheuma cottonii ORIGINATING FROM MORO ISLAND
type: item
description: Red seaweeds Eucheuma spinosum and E. cottonii are raw materials for producing carrageenan. Carrageenan is a group of polysaccharides widely used as thickening, stabilizing, and gelling agents across various industries. This study aims to determine the physicochemical characteristics of carrageenan from E. spinosum and E.cottonii seaweed. This research uses an experimental method: direct extraction with hot alkali, with three repetitions. The physicochemical parameters analyzed include yield, gel strength, viscosity, water content, ash content, and sulfate content. The results of the study of the physicochemical characteristics of carrageenan from E. spinosum raw materials produced a yield of 34.41%, gel strength 22.17 g/cm2, viscosity 1450 cP, water content 11.57%, ash content 24.41%, and sulfate content 24.89%. The results of the study of the physico-chemical characteristics of E. cottonii produced a yield of 29.54%, gel strength of 488.58 g/cm2, viscosity of 30.05 cP, water content of 9.95%, ash of 36.42%, and sulfate content of 21.42%. The FTIR profiles of E. spinosum carrageenan compounds show iota carrageenan, and those of E. cottonii carrageenan compounds show kappa carrageenan. The physicochemical characteristics of E. spinosum and E.cottonii carrageenan raw materials have met FAO standards, except for gel strength and ash content in E. cottonii carrageenan.
subject: Articles
  topic: section
subject: Sulfate Ester
  topic: keywords
subject: Functional Groups
  topic: keywords
subject: Iota Carrageenan
  topic: keywords
subject: Kappa Carrageenan
  topic: keywords
subject: Viscosity
  topic: keywords
creator: Ika Darmila Siregar
creator: Andarini Diharmi
creator: Rahman Karnila
rights: Copyright (c) 2025 Ika Darmila Siregar, Andarini Diharmi, Rahman Karnila (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 410
ending page: 418
doi: 10.31258/ajoas.8.3.410-418

ANTIMICROBIAL POTENTIAL OF MARINE PHOTOSYNTHETIC BACTERIA AND BIOPIGMENT EXTRACTS AGAINST AQUATIC PATHOGENS
type: item
description: Potential of marine photosynthetic bacteria (MPB) and their biopigment extracts as antimicrobial agents against two major aquatic pathogens, Aeromonas hydrophila and Staphylococcus aureus. The research was conducted from February to April 2025. Six MPB isolates were cultured under laboratory conditions to induce pigment production. Biopigments, natural pigments produced by microorganisms, exhibit antimicrobial and antioxidant properties. Pigment extraction was performed using acetone and ether, followed by evaporation to obtain concentrated pigment extracts. The antimicrobial activity of both MPB suspensions and their biopigment extracts was tested using the disc diffusion method on Mueller-Hinton Agar (MHA) media. The results showed that the MPB suspensions produced no inhibition zones against either pathogen. In contrast, the biopigment extracts demonstrated weak antimicrobial activity, with inhibition zone diameters ranging from 1 to 4 mm, a classification of weak. However, the ability of biopigment extracts to inhibit bacterial growth, even at low levels, suggests the presence of bioactive compounds with potential antimicrobial activity. These findings suggest that MPB-derived biopigments may serve as a natural alternative in future antimicrobial development
subject: Articles
  topic: section
subject: Biochemistry
  topic: keywords
subject: Biopigments
  topic: keywords
subject: MPB
  topic: keywords
subject: Aeromonas hydrophila
  topic: keywords
subject: Staphylococcus aureus
  topic: keywords
creator: Hersa Javayu Defitra
creator: Ummi Mardhiah Batubara
creator: Thamrin Thamrin
rights: Copyright (c) 2025 Hersa Javayu Defitra, Ummi Mardhiah Batubara, Thamrin Thamrin (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 385
ending page: 390
doi: 10.31258/ajoas.8.3.385-390

COMMUNITY STRUCTURE AND CARBON STOCK POTENTIAL OF MANGROVE ECOSYSTEMS IN THE COASTAL AREA OF BANGKO SUBDISTRICT, ROKAN HILIR REGENCY
type: item
description: The objectives of this study were to analyze mangrove community structure, estimate carbon storage and CO₂ sequestration potential, assess the economic value of CO₂ sequestration, and formulate management strategies for mangrove forests in the coastal area of Bangko Subdistrict, Rokan Hilir Regency. This research was conducted in October 2024 in the coastal area of Bangko Subdistrict, Rokan Hilir Regency, Riau Province. The method applied was a survey-based approach. Sampling stations were determined using purposive sampling. Mangrove community structure data were collected using 10 m × 10 m quadrat transect plots. A total of six observation stations were established, with three plots per transect. The potential carbon stock of the mangrove ecosystem was calculated based on carbon content from trunk biomass, roots, litter, and sediment. Biomass carbon estimation utilized species-specific allometric equations. The results recorded seven mangrove species: Avicennia alba, A. eucalyptifolia, A. lanata, Bruguiera parviflora, Rhizophora apiculata, R. mucronata, and Sonneratia alba. The highest relative density and the highest relative frequency were recorded for A.alba at Station I (75%) and Station II (42.86%). The highest relative dominance was recorded for Sonneratia alba at Station V (52.05%). The highest Importance Value Index (IVI) was observed for Avicennia alba at Station I (151.15%). The mangrove ecosystem in the coastal area of Bangko Subdistrict has an average carbon stock potential of 382.37 tons/ha, with an estimated CO₂ sequestration potential of 1,277.21 tons per hectare, totalling 15,893,618.87 tons. The estimated average economic value of carbon sequestration is IDR 1,081,274,726/ha, equivalent to IDR 13,455,438,919,367. Sustainable mangrove ecosystem management as a contribution to climate change mitigation can be implemented through the following strategies: ecosystem rehabilitation and protection, strengthening governance and law enforcement, community…
subject: Articles
  topic: section
subject: Carbon Stock
  topic: keywords
subject: Mangrove
  topic: keywords
subject: Carbon Sequestration
  topic: keywords
subject: Economic Value
  topic: keywords
subject: Mangrove Management
  topic: keywords
creator: Siti Komariah
creator: Deni Efizon
creator: Syafruddin Nasution
rights: Copyright (c) 2025 Siti Komariah, Deni Efizon, Syafruddin Nasution (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 373
ending page: 384
doi: 10.31258/ajoas.8.3.373-384

THE EFFECT OF ECO-ENZYME ON BIOMASS PRODUCTION OF Lemna sp. IN GIANT GOURAMI (Osphronemus gouramy) CULTURE SYSTEMS
type: item
description: Giant gourami (Osphronemus gouramy) is one of Indonesia's most valuable freshwater fish species; however, its aquaculture development is constrained by slow growth and low survival rates. Improving water quality through the use of aquatic plants such as Lemna sp. and the application of eco-enzymes is essential. The development of Lemna sp. depends on nutrient availability, especially nitrogen (N), phosphate (P), and potassium (K), which can be enhanced by adding an eco-enzyme. This study aimed to evaluate the effect of different eco-enzyme concentrations on Lemna sp. biomass production, specific growth rate, and water quality parameters in giant gourami culture systems. The research was conducted using an experimental method with a Completely Randomized Design (CRD) consisting of five treatments and three replications: P0 (0 ml/L), P1 (1.5 ml/L), P2 (2.5 ml/L), P3 (3.5 ml/L), and P4 (4.5 ml/L) of eco-enzyme concentration. The results showed that eco-enzyme administration significantly influenced Lemna sp. biomass. The best results were observed in treatment P4 (4.5 ml/L), which produced the highest Lemna sp. biomass (132.87 g) and specific growth rate (4.47%). Optimal water quality was recorded in treatment P4, with temperature ranging from 26.1–29.8°C, pH 5.5–8.38, dissolved oxygen 3.10–6.42 mg/L, phosphate 0.3097–0.3872 mg/L, nitrate 0.5517–10.2414 mg/L, and CO₂ 17–40 mg/L. These findings demonstrate that eco-enzyme application at 4.5 mL/L effectively enhances Lemna sp. productivity as a natural biofilter while simultaneously improving giant gourami growth performance and survival
subject: Articles
  topic: section
subject: Eco-enzyme
  topic: keywords
subject: Lemna sp
  topic: keywords
subject: Duckweed
  topic: keywords
subject: Integrated aquaculture
  topic: keywords
subject: Biomass production
  topic: keywords
subject: Water quality
  topic: keywords
creator: Naufal Arif Budiman
creator: Saberina Hasibuan
creator: Rodhi Firmansyah
rights: Copyright (c) 2025 Naufal Arif Budiman, Saberina Hasibuan, Rodhi Firmansyah (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 427
ending page: 439
doi: 10.31258/ajoas.8.3.427-439

ANALYSIS OF SEDIMENTATION RATES AT THE MOUTH OF THE MESJID RIVER IN DUMAI CITY: IMPLICATIONS FOR SILTATION AND SEDIMENT TRANSPORT
type: item
description: The Mesjid River Estuary in Dumai City is an area prone to sediment accumulation due to the influence of river hydrology dynamics and interaction with oceanographic processes in coastal waters. The sedimentation phenomenon that occurs has a direct implication on the rate of estuary siltation and sediment transport patterns that affect the balance of the aquatic ecosystem. This study aims to analyze the sedimentation rate and sediment characteristics at the Mesjid River Estuary and examine the impact of sedimentation on siltation and sediment transport patterns. This study was conducted in December 2024 at the Mesjid River Estuary, Dumai City, with the aim of analyzing the sedimentation rate and its implications for siltation and sediment transport. Sedimentation in estuarine areas is an important phenomenon that affects changes in channel morphology, navigation capacity, and coastal ecosystem balance. Data collection was conducted at six research stations from upstream to downstream by recording water quality parameters, sediment characteristics, sedimentation rates, total suspended solids (TSS), and sediment transport. The results showed that the sedimentation rate ranged from 7.0 to 10.3 cm/year, with an average of 8.77 cm/year, which is relatively high compared to other estuaries in Southeast Asia. The average TSS value of 135 mg/l indicates a significant supply of sediment from land erosion and anthropogenic activities, while the sediment transport load reached 338.2 tons/year, confirming the role of the estuary as a center of material accumulation. These conditions accelerate siltation, limit the efficiency of maritime transportation, and alter coastal morphological dynamics, necessitating active management strategies and sustainable mitigation to maintain ecosystem functions and support the sustainability of local economic activities
subject: Articles
  topic: section
subject: Sedimentation rate
  topic: keywords
subject: Estuary
  topic: keywords
subject: Siltation
  topic: keywords
subject: Estuaries
  topic: keywords
subject: Transport patterns
  topic: keywords
creator: Ilham Ilahi
creator: Mubarak Mubarak
creator: Farhat Ofirma
creator: Gita Purnama Sari
rights: Copyright (c) 2025 Ilham Ilahi, Mubarak Mubarak, Farhat Ofirma, Gita Purnama Sari (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 406
ending page: 409
doi: 10.31258/ajoas.8.3.406-409

EFFECTIVENESS OF REPLACING Artemia sp. FEED WITH FERMENTED PASTE FEED ON THE GROWTH AND SURVIVAL OF STRIPED CATFISH LARVAE (Pangasionodon hypopthalmus) PUSTINA STRAIN
type: item
description: Striped catfish (Pangasianodon hypophthalmus) in Riau is known as a commodity with bright prospects for cultivation, given increasing market demand aligned with community needs and its affordable price. This study was conducted from April 28 to June 7, 2025, at the Fish Breeding and Improvement Laboratory, Faculty of Fisheries and Marine Sciences, Universitas Riau. The objective of this study was to determine the optimal timing for switching from Artemia sp. feed to fermented paste feed to enhance the growth and survival rate of Pustina strain striped catfish larvae. The method used was an experimental method with five treatments and three replicates (15 experimental units) with a stocking density of 75 fish/tank and with treatments AR 5 T 5 PBF 30 (Artemia sp. 5 days + silkworms 5 days + Fermented Paste Feed 30 days), AR 5 T 7 PBF 28 (Artemia sp. 5 days + silkworms 7 days + Fermented Paste Feed 28 days), AR 5 T 9 PBF 26 (Artemia sp. 5 days + silkworms 9 days + Fermented Paste Feed 26 days), AR 5 T 11 PBF 24 (Artemia sp. 5 days + silkworms 11 days + Fermented Paste Feed 24 days), AR 5 T 13 PBF 22 (Artemia sp. 5 days + silkworms 13 days + Fermented Paste Feed 22 days). The best treatment was AR 5 T 13 PBF 22 (Artemia sp. 5 days + silkworms 13 days + Fermented Paste Feed 22 days), which produced absolute weight growth of 2.49±0.037e, absolute length growth of 5.99±0.62e, specific growth rate of 17.16±0.05e, and survival rate of 87.11±2.03a.
subject: Articles
  topic: section
subject: Fermented
  topic: keywords
subject: Striped catfish
  topic: keywords
subject: Growth
  topic: keywords
subject: Pustina
  topic: keywords
creator: Rizqy Putra Perdana
creator: Netti Aryani
creator: Nur Asiah
rights: Copyright (c) 2025 Rizqy Putra Perdana, Netti Aryani, Nur Asiah (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 356
ending page: 363
doi: 10.31258/ajoas.8.3.356-363

HEDONIC TESTING OF MILKFISH COOKIES WITH ADDED MORINGA LEAVES AS COMPLEMENTARY FOOD FOR PREGNANT WOMEN TO PREVENT STUNTING IN NUNUKAN
type: item
description: Chronic Energy Deficiency (CED) in pregnant women occurs due to nutritional deficiencies due to insufficient energy and nutrient intake, which can endanger the mother's health and cause fetal growth retardation. This condition can be prevented by providing supplementary feeding (PMT) to balance nutritional intake and to avoid stunting from in utero (1). Stunting can occur in utero and is only visible when the child is two years old. Based on data from the Central Statistics Agency (BPS) of Nunukan Regency, the number of babies born with low birth weight (LBW) increased from 225 babies (2022) to 353 babies (2023), while the number of babies with malnutrition increased from 192 babies to 391 babies in 2023 (2). The urgency of this study is the provision of complementary foods in the form of cookies for pregnant women from processed milkfish with additional nutritional value from moringa leaves for early stunting prevention in Nunukan Regency, North Kalimantan Province. Processed cookies are very important for pregnant women to achieve optimal nutritional adequacy. The purpose of this study is to test the hedonic (level of preference) and proximate testing on cookies made from milkfish (Chanos chanos) with the addition of moringa leaves (Moringa oleifera) as an effort to overcome the problem of malnutrition cases, especially about stunting that starts from mothers during pregnancy or pregnancy as an early prevention so that children are not born with a large birth weight (LBW), especially in Nunukan Regency, North Kalimantan. The research method was a survey to measure the level of preference or acceptance of milkfish cookies containing nutrients from moringa leaves among pregnant women, with 30 panelists. Complementary foods were analyzed for preference levels to assess the innovation's acceptance in the processing of these cookies. The results of the proximate analysis of this cookie product that still do not meet the requirements are the water and ash content. Meanw…
subject: Articles
  topic: section
subject: Milkfish
  topic: keywords
subject: Stunting
  topic: keywords
subject: Hedonic
  topic: keywords
subject: Pregnant mother
  topic: keywords
subject: Moringa Leaves
  topic: keywords
creator: Siti Hajar
creator: Jemri Jemri
creator: Sri Astika
creator: Jifa Jifa
creator: Alifah Alifah
rights: Copyright (c) 2026 Siti Hajar, Jemri Jemri, Sri Astika, Jifa Jifa, Alifah Alifah (Author) https://creativecommons.org/licenses/by/4.0
date: 2026-04-07
publication date: 2026-04-07
starting page: 18
ending page: 29
doi: 10.31258/ajoas.9.1.18-29

THE EXISTING CONDITION OF THE DRIED SALTED FISH SUPPLY CHAIN IN SIBOLGA CITY, NORTH SUMATRA
type: item
description: Sibolga City is one of the coastal areas in North Sumatra Province that plays a vital role in Indonesia’s marine and fisheries sector. This study aims to analyze the supply chain system of dried salted fish in Sibolga City, which includes three main components: the product flow, information flow, and financial flow. The research was conducted in September 2025 using a descriptive method with a mixed quantitative and qualitative approach. Primary data were obtained through interviews and field observations involving fishermen, dried salted fish processors, collectors, retailers, and the Department of Marine Affairs and Fisheries (DKP) of Sibolga City. In contrast, secondary data were derived from DKP reports. The results showed that there are three main supply chain patterns: (1) fisherman–processor–collector–retailer–consumer, (2) fisherman–processor–collector–consumer, and (3) fisherman–processor–direct consumer. On average, dried salted fish processors in Sibolga can produce between 100 and 200 kg per day, depending on the availability of raw materials. Shorter distribution channels generate higher efficiency by reducing marketing costs, accelerating the flow of information and finance, and maintaining product quality. This study concludes that the dried salted fish supply chain in Sibolga City has been functioning but remains sub-optimal. Strengthening coordination among actors, improving access to formal financing, and utilizing information technology in distribution and marketing are necessary to enhance efficiency and increase the added value of dried salted fish products at the local level.
subject: Articles
  topic: section
subject: Efficiency
  topic: keywords
subject: Fish Production
  topic: keywords
subject: Salted Fish
  topic: keywords
subject: Product Flow
  topic: keywords
subject: Supply chain
  topic: keywords
creator: Irwan Limbong
creator: Muhammad Yogi Prayoga
creator: Amraini Fitri
creator: Andrha Syatha Pahana
rights: Copyright (c) 2025 Irwan Limbong, Muhammad Yogi Prayoga, Amraini Fitri, Andrha Syatha Pahana (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 446
ending page: 452
doi: 10.31258/ajoas.8.3.446-452

GROWTH PATTERNS AND GONAD MATURITY LEVELS OF (Barbonymus schwanefeldii) FISH IN THE BATANG ASAI SAROLANGUN RIVER
type: item
description: The condition of the Batang Asai River in Sarolangun Regency, Jambi, has experienced a decline in water quality due to anthropogenic activities such as land clearing, settlement, and mining. This condition threatens the sustainability of fish populations, especially those from the Cyprinidae family, which are an important and environmentally sensitive group of fish for consumption, one of which is the lampam (Barbonymus schwanefeldii). However, scientific information on the bioecology of lampam in this region is very limited. Therefore, this research is needed to provide basic data to support adaptive conservation and fisheries management strategies. This study aims to analyze the growth patterns and gonadal maturity levels of lampam in the Batang Asai River, Sarolangun Regency, as a basis for inland fisheries management. A total of 113 fish, consisting of 64 males and 49 females, were observed. Male fish had a positive allometric growth pattern, while female fish had an isometric growth pattern. Analysis of Gonad Maturity Level (GML) found fish with GML I to GML IV, but immature gonads dominated the condition of the fish. In general, the water quality of the Batang Asai River still supports fish life, as can be seen from the growth patterns of the fish, but most of the fish found during the study were still immature despite the presence of fish with GML I to GML IV.
subject: Articles
  topic: section
subject: Barbonymus schwanefeldii
  topic: keywords
subject: Batang Asai River
  topic: keywords
subject: GML
  topic: keywords
subject: Lampam
  topic: keywords
creator: Yoppie Wulanda
creator: Rizky Janatul Magwa
creator: Ester Restiana Endang Gelis
creator: Septy Heltria
creator: Lauura Hermala Yunita
creator: Farhan Ramdhani
creator: Febrina Rolin
creator: Yusyam Leni
creator: Muhammad Hafidz Ibnu Khaldun
creator: Ainun Rohmawati Bareta
rights: Copyright (c) 2025 Yoppie Wulanda, Rizky Janatul Magwa, Ester Restiana Endang Gelis, Septy Heltria, Lauura Hermala Yunita, Farhan Ramdhani, Febrina Rolin, Yusyam Leni, Muhammad Hafidz Ibnu Khaldun, Ainun Rohmawati Bareta (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 398
ending page: 405
doi: 10.31258/ajoas.8.3.398-405

CLIMATE-INFORMED ECOLOGICAL MONITORING OF ZELI LAKE: REMOTE SENSING AND FIELD APPROACHES
type: item
description: The ecological and tourism potential of Zeli Lake has been assessed using remote sensing techniques based on aerospace data. Using OpenStreetMap and Google Earth, the eco-geographical features of the lake were identified from these materials. The lake covers approximately 2,551 m² (0.26 ha) and has a total perimeter of 202.4 m. Its absolute altitude is around 909 m above sea level, while the relative altitude (eye altitude) reaches 1.37 km. From a satellite view, the lake has an oval, leaf-like shape. According to Google Earth measurements, its map length is 76.60 m and ground length is 76.96 m with a heading of 193.43°. The width is 63.37 m on the map and 63.39 m on the ground, with a heading of 90.59°. The exact geographic location of the Lake is 40°24′24.6″ N, latitude, and 46°23′10.8″ E longitude. So far, the ecotourism resources of the research object have not been comprehensively studied. In this respect, the lake's climatic conditions were analyzed using Landsat satellite imagery, other remote sensing data, and field visits. Seasonal monitoring was conducted to assess climate, forest cover, and visitor activity. The woodland surrounding the lake covers about 0.88 ha within a perimeter of 678 m. The area remains largely undeveloped, with only a small café located on the shore; no cottages, hotels, or hostels exist nearby. During autumn migration, several bird species are observed around the lake. Many of these belong to the species listed in the “Green Book” and “Red Book” of the Republic of Azerbaijan. In conclusion, the lake itself is a valuable natural site with promising ecotourism opportunities. However, its ecosystem has not yet been fully investigated, and further interdisciplinary research is required to evaluate and sustainably develop its resources.
subject: Articles
  topic: section
subject: Monitoring
  topic: keywords
subject: Remote Sensing
  topic: keywords
subject: Climate Parameters
  topic: keywords
subject: Ecosystem
  topic: keywords
creator: Ulviyya Mammadova
creator: Fuad Guliyev
creator: Elchin Aliyev
rights: Copyright (c) 2025 Ulviyya Mammadova, Fuad Guliyev, Elchin Aliyev (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 453
ending page: 468
doi: 10.31258/ajoas.8.3.453-468

EFFECT OF Chaetomorpha sp. EXTRACT ON THE HEMATOLOGY OF TILAPIA (Oreochromis niloticus) INFECTED WITH Aeromonas hydrophila
type: item
description: Chaetomorpha sp. is a green macroalgae that contains various bioactive compounds with antibacterial and anti-inflammatory activities, as well as the potential to improve the physiological health of fish. This research investigates how incorporating Chaetomorpha sp. extract into the diet influences the hematological parameters of Tilapia (Oreochromis niloticus) challenged with Aeromonas hydrophila. The study used a completely randomized design (CRD) with four levels of extract supplementation (0, 25, 50, and 75 mL/kg of feed), with each treatment replicated three times. The hematological parameters analyzed included total erythrocytes, hematocrit, hemoglobin, and blood glucose. The findings indicated that adding Chaetomorpha sp. extract to the diet significantly (p<0.05) improved all hematological indicators relative to the control, with 50 mL/kg of feed as the most effective dosage. The highest erythrocyte count 1.89 x106 cells/mm3, hematocrit value 35.67%, hemoglobin concentration 6.87 g/dL and blood glucose level 90 mg/dL were observed in fish fed 50 mL/kg extract. This increase in hematological values indicates improved oxygen transport capacity, physiological condition, and metabolic response in fish. Bioactive constituents, including sulfated polysaccharides and flavonoids, are believed to enhance the hematological condition of fish. These findings confirm the potential of Chaetomorpha sp. as a natural supplement to support Tilapia health in sustainable aquaculture systems.
subject: Articles
  topic: section
subject: Chaetomorpha sp
  topic: keywords
subject: Hematology
  topic: keywords
subject: Oreochromis niloticus
  topic: keywords
subject: Aeromonas hydrophila
  topic: keywords
creator: M. Riswan
creator: Sri Wahyuni
creator: Ronal Kurniawan
creator: Hayatun Nufus
creator: Asri Mursawal
rights: Copyright (c) 2025 M. Riswan, Sri Wahyuni, Ronal Kurniawan, Hayatun Nufus, Asri Mursawal (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-12-25
publication date: 2025-12-25
starting page: 337
ending page: 344
doi: 10.31258/ajoas.8.3.337-344

POPULATION DYNAMICS OF KAWAKAWA (Euthynnus affinis) LANDED AT PPI UJONG BAROH, WEST ACEH
type: item
description: This study analyzed the population dynamics of kawakawa tuna (Euthynnus affinis) landed at PPI Ujong Baroh, West Aceh, from May to August 2025, using length-frequency data and the Von Bertalanffy growth model. A total of 815 individuals were measured to estimate growth, mortality, and exploitation parameters. The fork length ranged from 22–69 cm, dominated by medium-sized fish (30–37 cm FL), with the length at first capture (Lc = 33 cm FL) notably smaller than the length at first maturity (Lm ≈ 42–43 cm FL). Growth analysis indicated rapid juvenile growth, characterized by an asymptotic length (L∞) of 90 cm and a relatively high growth coefficient (K), while recruitment occurred periodically throughout the year. Mortality estimates showed total mortality (Z) of 4.77/year, natural mortality (M) of 1.45/year, and fishing mortality (F) of 3.32/year, resulting in an exploitation rate (E) of 0.70, which exceeds the optimal reference point (E = 0.5). These findings indicate that the kawakawa tuna stock in West Aceh is currently overexploited. This study provides the first updated, location-specific population parameter estimates for E. affinis in West Aceh waters, offering a critical scientific baseline for regionally adaptive fisheries management. Science-based management measures are therefore recommended, including implementing a minimum landing size of ≥43 cm FL, seasonal closures during spawning periods, effort control, and strengthened fisher participation to ensure long-term stock sustainability
subject: Articles
  topic: section
subject: Euthynnus affinis
  topic: keywords
subject: growth
  topic: keywords
subject: mortality
  topic: keywords
creator: Asri Mursawal
creator: Sri Wahyuni
creator: Anisa Mardhatila
creator: Oktavia Oktavia
creator: Fitri Diana
creator: Serliana Hotmariska Marbun
creator: Ronal Kurniawan
rights: Copyright (c) 2025 Asri Mursawal, Sri Wahyuni, Anisa Mardhatila, Oktavia Oktavia, Fitri Diana, Serliana Hotmariska Marbun, Ronal Kurniawan https://creativecommons.org/licenses/by/4.0
date: 2025-12-31
publication date: 2025-12-31
starting page: 345
ending page: 355
doi: 10.31258/ajoas.8.3.345-355

CONTROLLING CANNIBALISM OF ASIAN REDTAIL CATFISH (Hemibagrus nemurus) LARVAE USING PASTE FEED SUPPLEMENTED WITH TURMERIC FLOUR
type: item
description: Cannibalism is a significant issue during the early stages of Asian redtail catfish (Hemibagrus nemurus) culture, as it negatively affects survival rates. This study aimed to investigate of turmeric (Curcuma longa) flour supplementation in pasta feed to control cannibalism in Asian redtail catfish larvae and the potential to replace silk worm as a feed. A completely randomized design (CRD) was employed, consisting of five treatment groups with four replications each. The larvae were fed pasta diets supplemented with varying doses of turmeric flour (0, 5, 10, and 15 mg/kg), along with a comparative feed using Tubifex sp. The parameters assessed included cannibalism rate, survival rate, and growth performance. The results showed that the highest survival rate (93.33 ± 1.33%) and lowest cannibalism index (2.67 ± 0.94%) were observed in the group fed Tubifex sp. The highest weight gain (24.22 ± 0.53 g) and specific growth rate (9.35 ± 0.03%) were also recorded in this group. However, supplementation of turmeric flour at a dosage of 15 mg/kg in pasta feed was able to reduce cannibalism and improve the growth of Asian redtail catfish larvae. This treatment resulted in a cannibalism index of 11% and a survival rate of 82.67%. In terms of growth performance, larvae under this treatment exhibited a weight gain of 6.13 g, a length gain of 3.58 cm, a specific growth rate (SGR) of 6.07%/day, and a particular growth rate of length (SLR) of 4.25%/day. Pasta feed supplemented with 15 mg/kg turmeric flour can serve as an alternative to replace silk worms, achieving 25% of their weight gain and 63% of their length gain.
subject: Articles
  topic: section
subject: Asian Redtail catfish
  topic: keywords
subject: Turmeric Flour
  topic: keywords
subject: Cannibalism
  topic: keywords
subject: Growth
  topic: keywords
subject: Behavior control
  topic: keywords
creator: Ade Yulindra
creator: Benny Heltonika
creator: Netti Aryani
rights: Copyright (c) 2025 Ade Yulindra, Benny Heltonika, Netti Aryani (Author) https://creativecommons.org/licenses/by/4.0
date: 2025-08-12
publication date: 2025-08-12
starting page: 310
ending page: 318
doi: 10.31258/ajoas.8.2.310-318