1 SEPTEMBER 1999
A. Tago, Y. Yamamoto, S.-i. Teshima, A. Kanazawa-1999
Aquaculture, 179(1-4)-Special Issue: Proceedings of the VIII International Symposium on Feeding and Nutrition in Fish (recent Advances in Finfish & Crustacean Nutrition): 231-239
Abstract:
Phospholipids, such as soybean phosphatidylcholine (PC), in the diets have been shown to be indispensable for sustaining growth of certain larval fish. It has also been demonstrated that n-3 highly unsaturated fatty acids (HUFA), such as eicosapentaenoic acid (EPA, 20:5n-3) and docosahexaenoic acid (DHA, 22:6n-3), are essential for marine fish. These two nutrients, phospholipids and n-3 HUFA, are believed to be indispensable for normal growth and survival of marine fish larvae. The present research was conducted to determine the effect of 1,2-di-20:5-PC, 1,2-di-22:6-PC and 22:6-TG on growth and stress tolerance of larval Japanese flounder. Japanese flounder (20 days after hatching, mean total length of 9.6+/-1.0 mm) were fed microparticulate diets containing 1% phospholipids (purity 99%) for 30 days at 17.2-19.5 C. After the feeding trials, their tolerance in stress factors such as changes in water temperature and salinity, and exposure to low dissolved oxygen were determined. Results indicated that dietary 1,2-di-22:6-PC was more efficient than 1,2-di-20:5-PC and 22:6-TG for stress tolerance of Japanese flounder larvae towards increased water temperature and reduced DO.
(Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima 890-0088, Japan)