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Information Journal Paper

Title

STUDY OF EFFECT OF DIFFERENT LEVELS OF FISHMEAL REPLACEMENT BY CANOLA MEAL ON SERUM LIPIDS AND LIPOPROTEINS OF 100-G-RAINBOW TROUT (ONCORHYNCHUS MYKISS)

Pages

 Start Page 63 | End Page 65

Abstract

 Vegetative protein sources have an important role on reducing cost of diet. Use of these sources have also different metabolic effects. A 56 days feeding trial was conducted with RAINBOW TROUT to examine the effects of substitution of CANOLA MEAL (containing 12.5mmol Glucosinolate/g DM) with fishmeal in diets. CANOLA MEAL was substituted by fishmeal at 5 levels 10, 20, 30, 40 and 50 percentage. Each diet was assigned to triplicate groups in a completely randomized design with a control diet. Two hundred and sixteen fishes with average weight 100±15g were used in this trial. Twelve fishes were randomly assigned to each of 18 plastic tanks and were acclimated in these plastic tanks to the experimental conditions two weeks before treatment began. After 56 days from each diet, 9 fishes were chosen, stunned and bled. Cholestrol, triglyceride, LDL, HDL and VLDL were measured after sorting of plasma. This substitution caused significant differences in all criteria measured with control diet (p<0.05). With increase of substituted level, quantity of total cholesterol, triglyceride, low and very low density of lipoproteins decreased significantly (p<0.05) and quantity of high density of lipoprotein, specific growth rate (with exception of diets of 30, 40 and 50 percent), body weight index (with exception of diets of 10 and 20 percent) and final body weight (with exception of diets of 10 and 20 percent) increased significantly (p<0.05) with control diet. These results showed that replacement of fish meal to level of 50 percent by CANOLA MEAL, based on studies of fish blood serum and growth, is feasible.

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