Effect of partial replacement of marine protein and oil sources in presence of lyso-lecithin in the diet of tiger shrimp Penaeus monodon Fabricius, 1978

A 42-days growth trail was performed to evaluate the effect of lyso-lecithin in Penaeus monodon (5.08 +/- 0.08 g) in terms of growth and carcass fatty acid composition. Three iso-nitrogenous and iso-lipidic diets were prepared by partially replacing both marine protein and oil sources using plant based ingredients in the presence of soy-lecithin or lyso-lecithin. Each experimental diet was randomly allotted to three tanks with fifteen shrimps per tank and all the tanks were equipped with the flow-through system. Results revealed that shrimp fed diet with lyso-lecithin had significantly (p<0.05) higher specific growth rate, SGR (2.15) and daily growth coefficient, DGC (1.44) than those fed soy-lecithin (1.91 and 1.25 respectively). The growth pattern, feed and protein efficiency measures were not only better with lyso-lecithin compared to soy-lecithin and also on par with the control group. However, there was no significant difference in survival (82.22 to 84.44%) between the dietary treatments. The fatty acid composition of diets to a certain extent was reflected in the carcass composition of shrimp. The most essential fatty acids viz., eicosapentaenoic and docosahexaenoic acids were significantly (p<0.05) higher in shrimp fed lyso-lecithin supplemented diet. Present results suggest that lyso-lecithin enhances growth performance of P. monodon and carcass fatty acid composition compared to soy-lecithin due to its high emulsification properties with partial replacement of marine sources.