GROWTH RESPONSE AND MUSCLE LIPID QUALITY OF INDIAN WHITE SHRIMP FED DIFFERENT OILS AT TWO DIETARY LIPID LEVELS

Abstract

ABSTRACT A feeding trial was conducted to evaluate the effects of partial fish oil replacement with vegetable oils at two levels of dietary lipid on growth performance and muscle lipid quality of Indian white shrimp Fenneropenaeus indicus . Final weight of shrimp fed control diet (100% fish oil) was higher than that of shrimp fed the other diets. Partial replacement of fish oil with vegetable oils resulted in reduced levels of eicosapentaenoic acid and docosahexaenoic acid in shrimp muscle tissue. Increasing the dietary lipid level had an effect on lipid content of shrimp, by increasing lipid deposition in muscle tissue, but without a significant effect on growth. Concentrations of cholesterol in shrimp muscle were not significantly affected by dietary lipid source and level ( P > 0.05). Shrimp fed diets with 14% lipid had significantly higher concentration of malonaldehyde (thiobarbituric acid reactive substances) in muscle tissue than shrimp fed diets with 9.5% lipid. Vitamin E concentration in muscle of shrimp fed 100% fish oil was significantly ( P < 0.05) affected by dietary lipid level. PRACTICAL APPLICATIONS The high market value of and great demand for penaeid shrimp in the world market provide a strong stimulus for its intensive culture. The Indian white shrimp Fenneropenaeus indicus (Milen Edwards) was the most important shrimp species cultivated in Iran (due to market demand, high market value and local shrimp). It is a species with relatively slow growth potential compared to Penaeus monodon and its production is relatively low in intensive farms. It is mainly reared with commercial feed. Fish oil is an important ingredient used in commercial marine fish and shrimp feeds. The demand for fish oils in the aquafeed industry has increased steadily despite the static global production levels and may not be able to cater to the demand in the near future. Therefore, finding alternative to fish oils is one of the critical research areas in marine fish and shrimp nutrition.