Nutritional requirements of Penaeus orientalis for linoleic acid and linolenic acid

The dietary test of shrimp, P. orientates, was designed by means of the gradient menthod for linoleia acid and linolenic acid. The results showed that percentage weight gain and survival rate of the shrimp were affected by tooth content and ratio of linoleic acid and linolenic acid. In the present test the optimal requirement‘shrimp for linoleic acid and linolenic acid in the diet respectiG ely was 2.16% and 0.87%，the optimal ratio of them was 2.48，and the linoleic acid as an essential fatty acid is more effective than linoleic acid. In the shrimp practical diet containing lots of plant protein feedstuff rich in linoleic acid, the optimal percentage weight gain and survival rate of shrimp can he got by adding some level of linoleio acid and linolenic acid as there were the higher ratio and lower content of linoleic acid and linolenic acid in the diet.