Optimization of Stocking Density for Improved Growth and Aquaculture Production of Euryhaline Tilapia, Sarotherodon melanotheron

Mbaye Tine*, Maurice Correa, Moussa Guèye, Hamet Diaw Diadhiou and Mbacké Sembene

The study evaluates the impact of stocking density on the growth and survival of Sarotherodon melanotheron heudelotii juveniles in seawater, focusing on their performance under different stocking densities and fertilization regimes. One hundred sixty-two (162) S. melanotheron juveniles, each weighing approximately 3 grams, were used to test the effects of different densities: D10: (10 fish/m³), D15: (15 fish/m³), D20: (20 fish/m³) and D25: (25 fish/m³). Fish were stocked in 375-liter aquaria in triplicates, with the experiment lasting for 90 days. Temperature and dissolved oxygen levels were monitored daily and the fish were fed at 5-10% of their biomass. Survival rates, weight, size, weight gain, individual daily growth, specific growth rate, and voluntary intake were compared across different densities and fertilization regimes. Lower stocking densities (D10 and D15) resulted in better growth performance, with fish exhibiting higher weight gain, size, and specific growth rates compared to higher densities (D20 and D25). The reduced growth and survival rates observed at higher stocking densities indicate that overcrowding may negatively affect the welfare of the juveniles. Tanks with fertilization demonstrated better growth performance than unfertilized tanks, suggesting that fertilization can mitigate the negative effects of higher stocking densities. Fertilization likely enhanced water quality and availability of nutrients, contributing to the overall better health and growth of the juveniles. The study underscores the importance of managing stocking density and water quality in aquaculture systems, especially in marine and estuarine environments. Lower stocking densities (≤ 20 fish/m³), combined with good water management practices (e.g., fertilization) are crucial for optimizing the growth and survival of S. melanotheron. These findings could inform best practices for aquaculture operations focusing on this species.

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Published on: Dec 10, 2024 Pages: 38-49

Full Text PDF Full Text HTML DOI: 10.17352/2455-8400.000094
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