Current Issue: Latest Research in Aquaculture and Fisheries Management
Explore the latest advancements, research findings, and reviews in sustainable aquaculture and fisheries management. Our current issue covers a range of topics that address emerging challenges and opportunities in aquatic sciences. Access these peer-reviewed articles and stay informed on developments in aquaculture, fish breeding, water quality management, and sustainable fishing practices.
Featured Articles in the Latest Issue
- Volume 2(Issue 2) JULY– DECEMBER 2025
Research Articles
Overstocking, Stocking Density and Suboptimal Growth and Feed Conversion in Nile Tilapia Culture Systems
Vol.2(2); Pages:1-7. Published on July-2025
Abstract
The performance and welfare of fish in an aquaculture system considerably depends on the use of stocking density. Nile tilapia ( Oreochromis niloticus ) were reared in recirculating aquaculture systems ( RAS ) with different stocking densities to ascertain the influence of different stocking densities on growth, feed and stress levels of this fish. Three densities of 20 kg/m 3, 40 kg/m 3 and 60 kg/m 3 of stocking were undertaken over a period of 8 weeks. Findings revealed that the 40kg/m 3 stocking density recorded the highest specific growth rate (1.89%/day), optimal feed conversion ratio (FCR) of 1.42 and the least cortisol level which meant that there was minimal stress. Alternatively, the fish at 60 kg/m 3 recorded reduced weight gain, elevated stress markers, and poor FCR. The paper proposes moderate stocking densities (40 kg/m 3 ) as preference in maximizing growth performance and welfare in tilapia aquaculture. These observations give useful information on the best way to use resources and manage fishes in the recirculating settings.
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Dietary Probiotic Enrichment in The Enhancement of Growth Performance and Disease Resistance in Pacific White Shrimp
Vol.2(2); Pages:8-14. Published on August-2025
Abstract
The research focuses on exploring how Bacillus subtilis-enriched feed affects aquaculture of Pacific White Shrimp (Litopenaeus vannamei) growth performances, survival and its resistance to the disease. The fish were subjected to a 45-days feeding period, and the post-larvae were assembled into two groups, control and probiotic-town fed. Growth parameters such as weight gain and feed conversion ratio (FCR) were observed and thereafter, the pathogen challenge was done using Vibrio parahaemolyticus. The findings were that the weight gain of the probiotic fed group rose by 12.4 percent, and the FCR was significantly reduced to 1.39. Also, a reduction in mortality was found within the group taking probiotics after the challenge (48%, p < 0.01) which speaks of increased resistance to the disease. The results indicate that supplementation of Bacillus subtilis enhances the growth and immune response in L. vannamei and therefore a sustainable alternative to antibiotics in shrimp culture.
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Evaluation of Biofloc Technology as a Means of Improving the Water Quality and Growth Performance in the Fish Farming of Catfish
Vol.2(2); Pages:15-21. Published on August-2025
Abstract
In aquaculture, it has been pay attention to biofloc technology (BFT) which is a sustainable means of enhancing the water quality, nutrition and recycling of nutrients and sustain high intensities of fish farming. This research paper evaluated the performance of BFT technology and culture of the African catfish (Clarias gariepinus) over a 8 weeks cycle studying its performance against that of the conventional static water systems. The findings established that BFT systems had a significant impact on lowering toxic nitrogenous compounds, especially ammonia, with average levels at 0.25 mg/L. Their nurturing capacity was also found to provide an admirable survival rate of catfish in BFT tanks at 92.1% that was far more superior to that of conventional systems. Fish production also had a higher growth rate in the BFT cultivation system where the mean percent weight gain of fish was 14.7 percent higher and a better feed directly ratio (FCR) of 1.28, representing better utilization of feed (p < 0.05). The findings demonstrate the beneficial effect of BFT to provide more stable and self-regulating aquatic environment where water exchange is no longer required so often and it is also biosecure.
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Evaluation of the Effect of Floating Cage Design on Growth and Stress Response on Rainbow Trout in Alpine Reservoirs
Vol.2(2); Pages:22-29. Published on September-2025
Abstract
Cage design (Floating cage) is an important aspect of water flow, distribution of oxygen and fish health in open-water fish farming. The study involved the evaluation of the effectiveness of two floating cage systems, i.e., standard square cages and semi-circular V-shape cages that could be deployed in rearing Rainbow Trout (Oncorhynchus mykiss) at a high-altitude reservoir and they operated over a 10 week period. A higher specific growth rate of 9.2 % was recorded in the V-shaped fish cages than in the square cages of fish, implying better growth conditions as a result of the good water flow and oxygen distribution. Also, plasma cortisol concentration, a stress indicator was lower in fish in V-shaped cages depicting low levels of stress. The amount of dissolved oxygen was steady greater in the V-shaped cages owing to increased flow of water. It has been found that the operational costs of the two designs of cage were similar after carrying out a cost-benefit analysis. The results confirm that some engineering design modifications of cages could substantially provide better welfare and lower stress, growth of fish, by far at a cheaper cost of making the coldwater aquaculture systems to work in the best possible way.
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Analysis of Stock Structure and Genetic Characterization of wild and hatchery reared Rohu based on Microsatellite Markers
Vol.2(2); Pages:30-37. Published on September-2025
Abstract
Genetic diversity plays a very significant role in ensuring sustainability in the long run in aquaculture species. The objective of this paper was to find the genetic difference and population structure of the wild-caught and hatchery-reared Labeo rohita (Rohu) based on ten polymorphic microsatellite loci. These samples were obtained through three wild river populations and 4 major hatcheries throughout South Asia. Genetical studies showed very low heterozygosity in the hatchery stocks (Ho = 0.58) as compared to the wild population (Ho = 0.72), and therefore, there is less genetic diversity in fish raised in the hatcheries. Also, there was moderate genetic differentiation between wild and hatchery populations (Fst = 0.084), which signifies the genetic segregation of those populations. The findings pose some worrying issues on the case of genetic bottleneck and inbreeding on hatchery stocks, which can hamper their health, adaptability, and productivity. The paper suggests as a means of averting these risks adoption of rotational breeding programs and use of wild genetic lines in addition to hatchery stocks. These steps are going to allow sustaining healthy widespread populations with high genetic diversity which will make fish production sustainable and durable.
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