Necessity of Dietary Phospholipids for Growth of the Larval Ayu

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  • アユ仔魚の成長に対する食餌性リン脂質の必須性

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The effects of dietary phospholipids on growth of the larval Ayu Plecoglossus altivelis were investigated by using the microparticulate diets with a carrageenan as a binder. The 10-day larvae showed better growth on the diets with 3% levels of chicken-egg lecithin (CEL), soybean lecithin (SBL), or bonit-egg lecithin (BEL) than with a phospholipid-deficient diet. The nutritive value of SBL for the 10-day larvae was superior to that of bonito-egg cephalin. The growth and survival of 10-day larvae were improved with the increasing levels of phospholipids from 0% to 5% when SBL was used as a phospholipid source. As for the 30-day larvae, the addition of 3% phospholipids to the diets was also found to improve growth and survival, indicating the inferior nutritive value of soybean cephalin to those of CEL, SBL, and BEL. As for the 10-day and 30-day larvae, the nutritive values of CEL and BEL were slightly higher than that of SBL when 3% levels of respective phospolipids were added to the diets.

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