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Abstract
In an investigation of juvenile longfin batfish (Platax teira), the effects of rearing densities at 1.0, 1.5, 2.0, and 2.5 individuals per liter were evaluated to determine their impact on growth, survival, and feed utilization efficiency. Longfin batfish with an initial size of 1.60 ± 0.12 cm and 0.21 ± 0.05 g/fish were stocked in triplicate into 250 L composite tanks. The experiment was conducted for 28 days. Growth rates in length and weight were significantly higher at lower densities of 1.0 and 1.5 individuals per liter, with the lowest growth observed at a density of 2.5 individuals per liter. Coefficients of variation in length and weight also favored the lower densities. The survival rate, however, remained consistent across all densities, suggesting that increased density within the tested range does not negatively affect survival or health. Feed conversion ratio (FCR) was more efficient at densities of 1.0 – 1.5 individuals per liter. Biomass yield, on the other hand, increased with density, peaking at 2.5 individuals per liter. These results suggest that while lower densities are better for individual growth and feed efficiency, higher densities may yield greater biomass output. A density of 1.5 individuals per liter is recommended for balancing individual growth performance with overall biomass production. This study underscores the importance of optimizing rearing density in aquaculture for economic viability without compromising fish welfare. Further research should include assessments of immunological, stress, and biochemical indicators to fully understand the effects of density on longfin batfish and refine aquaculture practices for this species.
Keywords: longfin batfish, feed ultilization efficiency, growth, Platax teira, stocking density.