Proceedings International Conference on Fisheries and Aquaculture

BROODSTOCK FECUNDITY AND FRY SURVIVABILITY IN NILE TILAPIA (Oreochromis niloticus): EFFECTS OF DIETARY NUCLEOTIDE SUPPLEMENTATION IN AN ON-FARM FEEDING TRIAL

2024-09-26T12:15:26+0530

The rapid expansion of global aquaculture has highlighted the importance of optimizing tilapia broodstock management to address challenges such as low fecundity and fry survival. This study explores the potential of dietary nucleotide supplementation, specifically Nucleoforce Aqua™, in enhancing broodstock fecundity and fry survival within tilapia aquaculture systems. A farm feeding trial, adapted to the principles of practical farm practice, involved administering dietary nucleotides at a 0.05% concentration to tilapia broodstock over a span of thirty (30) days, with the experiment encompassing two distinct treatment groups: T1, supplemented with dietary nucleotides, and T2, a control group without supplementation. Preliminary findings unveil promising trends. Broodstock receiving Dietary Nucleotide exhibited significantly higher fry production and survival rates compared to the control. Analysis of O. niloticus fecundity underscores a marked disparity between treatments. T1 yielded an average of 186,000 fry, outperforming T2's 124,000 fry produced from Commercial Diet alone. The Independent Samples T-Test confirmed the statistical significance of this difference, with p-values of 0.004 (one-tailed) and 0.008 (two-tailed), both below the standard significance threshold of 0.05. This result indicates a statistically significant effect of dietary nucleotide supplementation on fecundity. Although fry survival rates between T1 (65%) and T2 (62%) showed minimal differences, the marked 50% increase in fecundity underscores the potential of nucleotide supplementation to enhance reproductive outcomes. These findings suggest that dietary nucleotides can enhance broodstock productivity, addressing challenges in tilapia aquaculture and potentially improving farm sustainability and profitability. This study contributes to the understanding of nutritional strategies in improving broodstock performance and overall aquaculture productivity. Further research is recommended to explore the effects of nucleotide supplementation under varied environmental conditions and to assess cost-effectiveness, enabling the optimization of this technology for broader application in the industry.

THE IMPACT OF PROBIOTICS ON THE GROWTH AND SOIL AND WATER QUALITY OF FRESHWATER FISH, Pangasius hypophthalmus AND Piaractus brachypomus

2024-12-19T15:42:43+0530

In aquatic farming, probiotic products are seen as an alternative to the use of antibiotics. In freshwater fishes can benefit from probiotic organisms in a number of ways, including increased growth, reduced pathogen colonization, improved nutrient digestion, improved soil and water quality, increased stress tolerance, improved feed utilization, and an increased survival rate. can benefit from probiotic organisms in a number of ways, including increased growth, reduced pathogen colonization, improved nutrient digestion, improved soil and water quality, increased stress tolerance, improved feed utilization, and an increased survival rate. Present study techniques to include the probiotic strains in the fish feed pellets to development of fish biochemical and digestive system and organic waste buildup degrades the quality of the soil and water, which inhibits the growth of freshwater fish in earthen ponds. In order to prevent this issue, a 90-day supplementation experimentation was carried out to ascertain the impact of commercial probiotics "Super-PS" on the maintenance of beneficial soil and water quality parameters as well as the development of Pangasius hypophthalmus and Piaractus brachypomus fish cultured in freshwater earthen ponds. There are numerous ways that probiotic bacteria can enhance the quality of soil and water. Rhodococcus and Rhodobacter species are combined in "Super-PS." During the culture period, a freshwater pond was treated with water probiotic "Super PS" for 15 lit/ha from 1 to 30 days, 30 lit/ha from 31 to 60 days, 40 lit/ha from 61 to 90 days, and 91 days, depending on the pond condition, stocking density, and culture days, until harvest. The factors responsible for the improved water quality and significant growth up to harvest fresh water fishes under the influence of soil and water probiotics was analysed and together with the digestive enzymes, biochemical composition and histologically confirmed.

MICROPLASTIC ACCUMULATION IN Saccostrea cucullata ALONG SRI LANKA’S WEST COASTAL BELT: IMPLICATIONS FOR SEAFOOD SAFETY POLICY RECOMMENDATIONS

2024-10-10T14:01:28+0530

Microplastics (MPs) are pervasive pollutants in marine environments, posing significant threats to ecosystems and human health. This study investigates the accumulation of MPs in Saccostrea cucullata (Rock Oysters) along the West coast of Sri Lanka from August 2021 to July 2022. Six sampling sites were selected to represent areas with varying anthropogenic activity, such as urbanization and tourism. MPs were extracted using alkaline digestion, and identified through hot needle tests and Fourier-Transform Infrared (FTIR) spectroscopy. The results revealed significant spatial variations in MPs concentrations, with the highest mean concentration recorded at Galleface (5.11 ± 2.2 MPs/g w.w.) and the lowest at Negombo Beach (2.60 ± 0.77 MPs/g w.w.). Filamentous blue particles were the most common, and particles smaller than 1 mm comprised nearly 25% of the total MPs. Seasonal factors, particularly the monsoon, influenced the temporal distribution of MPs. This study underscores the urgent need for pollution mitigation strategies, including waste management interventions and public awareness, to protect marine ecosystems and safeguard seafood safety in Sri Lanka.