Lysine and/or phytase supplementation in the diet of Penaeus monodon (Fabricius) juveniles: Effect on growth, body composition and lipid profile

Abstract A 60 days experiment was undertaken to study the effect of dietary supplementation of lysine and/or phytase on growth, body composition and fatty acid profile of P. monodon juveniles. Two hundred tiger shrimp, Penaeus monodon (Fabricius) juveniles (initial body weight: 140 ± 2.5 mg) were divided into four treatment groups with each of four replicates. Four isocaloric (457.56 ± 0.83 kcal/100 g) and isonitrogenous (34.84% crude protein) soybean meal based diets were prepared by supplementing with lysine 1% (T 2 ) or phytase 500 FTU (T 3 ) or both lysine 1% and phytase 500 FTU (T 4 ), whereas no supplementation was taken as control (T 1 ) group. Dietary lysine supplementation had a significant effect ( P P  > 0.05) on growth. Either extract content of the whole tissue reduced significantly ( P P P  > 0.05) on phytase supplementation. Total n-3 content was reduced and n-6 content increased significantly ( P 4 − N, NO 2 − N and NO 3 − N) discharge significantly, whereas phosphorus excretion was reduced in the phytase supplemented group. This concludes that supplementation of both lysine and phytase in soybean-based diet not only reduces the nitrogen and phosphorus load of the culture system but also significantly changes the fatty acid profile of the tissue of the P. monodon .