Asian Journal of Fisheries and Aquatic Research
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Growth and Survival Performance of Labeo rohita Fingerlings under Temperature Gradients
No full textWorldwide heating is expected to affect the aquatic environment and aquaculture industry. In the current experiment, we have observed growth and water quality of Indian major carp (Labeo rohita) exposed to three different temperature regimes, 28°C, 30°C, and 32°C on the growth and development of L. rohita fingerlings housed in aquariums for 31 days were examined. The fish were given pelletized food continuously. Fish kept in water at 32°C grew significantly (P<0.05) more rapidly (SGR and FCR) than fish kept at other temperatures. This simple growth model produced a consistent growth (SGR 2.27%/day) between 28 and 32°C. At 30 to 32°C, the highest body weight increase and lowest feed conversion ratio (FCR) were observed 30 to 32°C was shown to have the highest specific growth rate. A temperature rise of around 28 °C is optimum, with 30 °C and 32 °C being the ideal range for manufacturing. Survival rate 100.00±0.00, 100.0±0.00 and 100.0±0.00. This further implies that suitable measures must be implemented to maintain the optimal temperature in aquaculture farms in order to avert the adverse consequences of climate change
Genetic Diversity of Selected Decapods in Nigerian Niger Delta Rivers Using DNA Barcoding
No full textShellfish are those aquatic animals with exoskeleton covering as chitin. Crabs are crustaceans of the family of decapoda, sexually dimorphic and omnivores. Over the years identification of organisms has been based on morphological characteristics and that has proven difficult because of alterations from environment and inters- special alterations. This research was aimed at elucidating the DNA barcodes of the shellfish obtained from Akor and Itu Rivers from Abia State and Akwa Ibom state Nigeria respectively. The methods of identification included DNA extraction, Agarose Gel Electrophoresis, Polymerase Chain Reaction, Sequencing and Phylogenetic analysis. Crab samples were collected for the period of 18 months running from May 2023 through October 2024 covering different seasons of Nigeria from the different sites. The crabs caught where average number of 14.97±11.93 and average weight of 33.73±11.258g. the crabs obtained from Akor River were 6.42±2.37 and the ones obtained from Itu River was 23.53±11.52. there were low number of catch from the rivers generally during the rainy season such as 8.75±2.99, 8.75±1.26 and 9.50±1.91 of the moth of June, July and August 2023. Although there were more number of crabs caught from Itu river, the weight of crabs obtained from Akor river with 35.64±11.67g were bigger than Itu river with 31.81±10.71g.
Females caught from the rivers were 15.22±12.48 and the males 14.72±11.54. The PCR showed availability of the DNA samples available in the content as they moved in the electrolyte medium at less than 600bp. The crabs after sequencing showed 95% similarity with Sudanonates floweri after blasting and more than 90% pair-wise sequence alignment. The phylogentic tree further expressed their close relationships with other species along the lines of identification and genera
Evaluation of Yellow Bean (Phaseolus vulgaris) as a Fish Feed Ingredient: Effects on Growth, Blood Parameters, and Immunology in Nile Tilapia (Oreochromis niloticus)
No full textThis study evaluated the dietary inclusion of Yellow Bean (Phaseolus vulgaris L.) concentrate as a sustainable plant-based protein source in the diets of Nile tilapia (Oreochromis niloticus), aiming to assess its effects on growth, hematological, and immune parameters. A total of 450 juvenile tilapia (11.6 ± 0.1 g) were fed diets containing graded inclusion levels of Yellow Bean concentrate—0% (control), 25%, 50%, 75%, and 100%—over a 60-day feeding trial. Growth performance indices, blood biochemical parameters, and non-specific immune responses were measured. The results revealed that partial substitution of conventional protein sources with Yellow Bean at 25–50% inclusion levels significantly improved key performance indicators such as feed intake (FI = 60.6 g in YBD-4), catalase activity (CAT = 13.7 U/mg), and plasma lysozyme activity (6.10 U/ml) (p < 0.05), without compromising fish health. The highest survival rate (97.5%) was observed in the 100% inclusion group (YBD-5), although feed conversion efficiency declined at higher inclusion levels. These findings suggest that 25–50% Yellow Bean inclusion offers an optimal balance of growth and immune enhancement, indicating its potential as a viable and eco-friendly alternative protein ingredient for tilapia aquaculture
A Review on Untapped Potential of Visakhapatnam\u27s Trash Fish for Bioactive Peptide Applications
No full textTrash fish from the Visakhapatnam coast are emerging as promising sources of bioactive peptides with antioxidant, antihypertensive, antimicrobial, and anti-inflammatory activities. These peptides, released through enzymatic hydrolysis, possess functional properties linked to their specific amino acid composition. Although traditionally discarded or used in low-value applications, these underutilized species are rich in quality proteins suitable for peptide production. Enzymes like alcalase and papain have proven effective in generating biologically active hydrolysates. In vitro assays and advanced tools such as LC-MS/MS and bioinformatics platforms further support the potential of these peptides. However, gaps remain in species-specific characterization, in vivo validation, and industrial application. Valorizing these marine resources offers a sustainable pathway for developing functional foods and nutraceuticals while supporting circular bioeconomy initiatives
Population Dynamics of Hydrocynus forskahlii (Cuvier, 1819) from Roseires Dam Reservoir, Sudan
No full textThis study examines the growth, mortality, and recruitment patterns of H. forskahlii in Sudan\u27s Roseires Dam Reservoir. During the study period, 675 fish specimens were collected from November 2021 to November 2022. The collected samples ranged in total length from 14.3 cm to 57.0 cm, with an average length of 30.599 ± 10.167 cm. Growth parameters, derived from the von Bertalanffy equation, yielded an asymptotic length of 58.8 cm and a growth coefficient of 0.260 yr.⁻¹. Mortality analysis showed a total mortality rate of 0.69 yr.⁻¹, natural mortality: 0.58 yr.⁻¹ and fishing mortality: 0.11 yr.⁻¹. Two recruitment peaks were identified in March/May and July/October. The exploitation rate was 0.17 yr.⁻¹, indicating under-exploitation at sustainable fishing pressure. The length-weight relationship revealed a negative allometric growth. Measures for improved fishery practices based on the study\u27s findings are recommended
Fisheries Conflict Resolution as an Instrument for Community Empowerment in Sebatik Island, North Kalimantan, Indonesia
No full textCoastal areas and outer islands have abundant fishery resources and have the potential to become the basis of the local economy. Communities living on outer islands face various challenges in the form of limited infrastructure, access to education, health services, and geographical isolation. In addition, they are also vulnerable to various socio-economic and resource management issues, including horizontal conflicts between coastal community groups that can hinder economic and social development and growth. This study aims to identify sources, types, conflict resolutions and community empowerment strategies on Sebatik Island, North Kalimantan, Indonesia. The study was conducted from March to May 2025 in the villages of Liang Bunyu and Binalawan, Sebatik Island. The study used a descriptive qualitative method in exploring sources, types, resolutions and community empowerment strategies. The results of the study indicate that the sources of conflict in the research area are related to competition for space and resources, differences in technology and business scale, non-existent and unclear zoning and regulations, weak local institutions, economic and social pressures. Conflict resolution solutions are carried out through participatory marine spatial planning and zoning, strengthening local institutions and mediation forums, economic integration and livelihood diversification, environmental education and social dialogue, restorative and legalistic approaches and community social mapping. Empowerment strategies offered through participatory mapping and zoning actions, strengthening institutions and multi-party forums, livelihood diversification, social education and conflict literacy, inter-sectoral collaboration and ecosystem approaches. Sources and types of conflict if not managed properly can hinder sustainable development in border areas
Fish Health Management and Biosecurity Compliance in Some Fish Farms in the Southern Part of Lagos State, Nigeria
No full textThe study was an assessment of fish health management and biosecurity compliance in 62 fish farms in the southern part of Lagos State Nigeria. Cluster sampling was used in selecting the farmers in the study areas. Data was collected using well-structured questionnaires and interview. Descriptive and Chi square statistic was used for data presentation and analysis. The study revealed that majority of the respondents have attained tertiary education (63.5%), with 5 -9 years of experience in fish farming (75.8%). Majority of the fish farmers (66.7%) lack awareness of biosecurity. The sudy showed that all the respondents do not vaccinate their fish, do not use hand sanitizer and do not use specific protective clothing, respectively. Also all the respondents reported daily fish mortality ranging from 1-44 fish. This study concludes that there is a paucity of knowledge on fish health management systems and biosecurity measures which presents a serious threat to aquaculture production in the studied areas and poses a great risk of disease spread to neighbouring fish farms. This study recommends the development of a coordinated awareness campaigns on fish health manage‑ ment and biosecurity measures to fish farmers in the study areas, by fish pathologists and aquatic veterinarian. This can be done through seminars, workshops, conferences and advisory services, to ensure optimum fish production. The findings of this study will serve as a baseline information for fish farmers to adhere to strict biosecurity and biosafety measures in their fish farms to avoid the spread of diseases in their fish populations.  
General Profile and Human Capital of Small-scale Gillnet Fisherman in the Coastal Area of Karangsong, Indramayu Regency
No full textThis study aims to analyze the general profile and human capital condition of small-scale gillnet fishermen in the coastal area of Karangsong, Indramayu Regency, West Java. The research adopts the Sustainable Livelihood Framework (SLF), focusing on five types of livelihood assets, with a particular emphasis on human capital. This study was conducted between January and February 2025 using a descriptive quantitative approach through surveys and interviews with 50 purposively selected fishermen. The results indicate that most fishermen are within the productive age group (31–50 years), yet have low formal education levels and limited access to training and healthcare services. Overall, the human capital score was relatively low (57.85%), as measured using a five-point Likert scale based on indicators of education, health, skills, and training, making it the most vulnerable asset compared to others. The score was derived using a five-point Likert scale across selected indicators including education, training, health access, and adaptive capacity. Although fishermen possess strong local knowledge, their limited education and skill development hinder their ability to adapt to technological and market changes. Therefore, enhancing human capital through non-formal education, locally tailored training programs, and integration of traditional knowledge with modern fishing technologies is a strategic effort to support the sustainable livelihoods of small-scale fishermen
Analysis of Eel (Monopterus albus) Export Development Strategy in South Kalimantan Province
No full textEel is a freshwater fish that has not yet been optimally utilized in the development of Indonesia\u27s national fisheries sector.The study aims to analyze the strategy for developing eel exports in South Kalimantan Province. This study was conducted in South Kalimantan Province covering the areas producing eel catches, collectors or suppliers and exporters, namely Hulu Sungai Utara Regency. Data analysis using SWOT analysis. The eel export strategy in South Kalimantan Province, Indonesia, especially Hulu Sungai Regency, is the largest eel producing area with Commanditaire Vennootschap (CV). Tiga A as the sole active exporter that exports live eels to the Chinese market through a distribution chain involving catchers, collectors, suppliers, and exporters. SWOT analysis places CV. Tiga A in Quadrant I (S-O), which reflects the company\u27s solid internal strengths and significant external opportunities. This condition is a strategic foundation for the company to implement an aggressive strategy in developing sustainable live eel exports, so that it has the potential to increase competitiveness and export market growth optimally
Plankton Diversity and Water Quality of River Ose, Ondo State, Southwest Nigeria
No full textThis study was conducted to investigate the plankton diversity and physico-chemical characteristics of River Ose in providing information that can be used for proper management and conservation of the water body. Plankton samples and water quality parameter were observed for 12 months (February, 2022 to January, 2023). Plankton abundance was estimated using Shannon-wiener diversity index (H). Physico-chemical parameters which include: pH, Temperature, Conductivity, Dissolved Oxygen, Salinity and Total Dissolved Solid were determined insitu using a multi-parameter probe meter. The species composition of phytoplankton was dominated by five phyla, Bacillariophyta, Chlorophyta, Cyanobacteria, Ochrophyta, and, Myzozoa while that of zooplankton were the Arthropod, Ciliophora and Rotifera groups. Spirogyra sp. which belongs to the phylum Chlorophyta had the highest relative abundance (8.31%) while Thalassionema sp. which belong to phylum Ochrophyta had the lowest relative abundance (0.83%). Higher abundance of plankton was recorded during the dry season (61.13%) when compared with the raining season (38.38%). Shannon-Wiener diversity index (H) and Evenness (E) were 3.25 and 0.93 respectively. The results of the physicochemical parameters were within the acceptable range across the 12 months of study