Effects of graded levels of a blend of Tisochrysis lutea and Tetraselmis suecica dried biomass on growth and muscle tissue composition of European sea bass ( Dicentrarchus labrax ) fed diets low in fish meal and oil
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Author/sCardinaletti, G. Messina, M. Bruno, M. Tulli, F. Poli, B. M. Giorgi, G. Chini-Zittelli, G. Tredici, M. Tibaldi, E.
The aim of this study was to evaluate nutrient digestibility, growth response, carcass and fillet yields, muscle tissue composition and skin colour appearance of European sea bass (D. labrax) fed graded levels of a mixture of Tisochrysis lutea and Tetraselmis suecica freeze-dried biomass in partial substitution for fish meal and oil in diets containing substantial levels of vegetable oils and protein-rich derivatives. Five complete diets were formulated to be grossly isoproteic and isolipidic and prepared by including a blend of the two freeze-dried microalgae biomass in a 2:1 weight ratio, to replace approximately 15, 30 and 45% fish meal protein and 12, 24 and 36% fish lipid of a positive control diet. A negative control complete feed high in soybean meal was also prepared. Each diet was offered in triplicate, during 105 days until visual satiety of fish (204 ± 12.7 g) kept in a semi-closed recirculating marine water system ensuring optimal water quality to E. sea bass. The results o...