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Not AvailableAmong the four lipids, cod liver oil, prawn head oil, sardine oil and soybean lecithin, tested at 6% level in a purified diet, for the prawn Penaeus indicus, the diets having prawn head oil and a mixed lipid consisting of all the four lipids in equal proportions, showed significantly (P<0.01) higher growth and the best food conversion ratio (FCR). These wore followed by the diets having soybean lecithin, sardine oil and cod liver oil in the decreasing order. Investigations on the effect of lipid level in the diet on the growth, FCR and survival of the prawn have shown that the diet having 6% lipid produced significantly higher growth (P