Growth performance and nutrient utilization of glass catfish (Kryptopterus lais) larvae in response to varying dietary protein levels
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This study evaluated the effects of varying dietary protein levels (35, 40, 45, and 50%) on growth, feed utilization, and body composition in Glass catfish, Kryptopterus lais, larvae over 30 days. Larvae with an initial average weight of 0.15±0.01 g were distributed into 12 aquaria at a density of 50 individuals per tank. Fish were fed four times daily to apparent satiation. The results indicated that weight gain (WG) increased with dietary protein levels up to 40%, beyond which WG declined. Similarly, the feed conversion ratio was lowest in fish fed the 40% protein diet. The protein efficiency ratio was significantly higher in K. lais larvae fed the 40% protein diet compared to those fed diets containing 45 and 50% protein. Body composition analysis revealed that larvae fed the 40% protein diet exhibited the highest protein content, while those fed the 35% protein diet had a significantly elevated lipid content. Broken-line regression analysis, based on the specific growth rate, estimated the optimal dietary protein requirement for maximal growth performance to be 42.89%. These findings provide a quantitative basis for formulating diets that effectively meet the protein requirements of K. lais larvae.
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