Effects of highly unsaturated fatty acids and ratio of eicosapentaenoic to docosahexaenoic acids on growth and survival of black tiger prawn Penaeus monodon postlarvae
1996
Suwanich, R. | Piyatiratitivorakul, S. | Kittakoop, P. | Menasveta, P. (Chulalongkorn Univ., Bangkok (Thailand). Faculty of Science. Biotechnology Program)
Effect of n-3 highly unsaturated fatty acids (HUFAs) and the ratio of eicosapentaennoic acid to docosahexaenoic acid (EPA/DHA) on growth and survival of black tiger prawn Penaeus monodon postlarvae was studied. A completely randomized design experiment with 7 diets (treatments) was used. Six experimental diets contained two levels (1.0 and 1,5 percent) of n-3 HUFAS, with 3 ratios (1:3, 1:2, 1:1) of EPA/DHA in each level. The control diet contained 0.35 percent n-3 HUFAs with the EPA/DHA ratio of 1:3. Three replicates (100 postlarvae/cubic m) were used in each treatment, except the control (two replicates). Postlarvae were fed 5 times a day, and the feeding period lasted 30 days. There was an interaction between n-3 HUFAs quantity and the EPA/DHA ratio on growth and osmotic resistance of postlarvae. The better growth rate was observed in shrimps fed on diets containing 1 and 1.5 percent of n-3 HUFAs with the EPA/DHA ratio of 1:1 and 1:2, respectively. However, the diets providing shrimp better osmotic resistance were composed of 1 and 1.5 percent of n-3 HUFAs with the EPA/DHA ratio of 1:2 and 1:3, respectively. Neither quantity of HUFAs nor the EPA/DHA ratio had effect on survival rate. Dietary fatty acids had an influence on the fatty acid profile in tissue of the experimental shrimp. Polar lipids had more n-3 HUFAs than non-polar lipids. Similarly, the EPA/DHA ratio in the diet also had an influence on the EPA/DHA ratio in polar lipids more than that in non-polar lipids. The present work suggests that the diet containing n-3 HUFAs 1.5 percent with the EPA/DHA ratio of 1:2 is recommended for normal growth and osmotic resistance in P. monodon.
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