For a sustainable aquaculture industry, current levels of fish meals/oils in aquafeeds need to be drastically reduced and mostly replaced by vegetable counterparts. In this contest, the use of marine microalgae in aquafeeds has recently attracted much scientific attention due to their high protein content and lipid levels, including ω-3 long-chain PUFAs. Microalgae produced under controlled conditions in novel photobioreactors can supply biomass of constant and suitable quality to be included in aquafeeds at relatively competitive costs. In the present study, we investigated the growth performance and body composition of sea bass (Dicentrarchus labrax L.) in response to diets where graded levels of a blend of two marine microalgae were included in low fish meal/oil diets. A blend of dried biomass of Isochrysis aff. galbana (T-ISO) and Tetraselmis suecica in a 2:1 w:w ratio, was used to replace 15, 30 and 45% fish meal protein of a positive control diet with a 50:50 fish to vegetable protein-lipid ratios. The microalgae-containing aquafeeds were also compared to a diet (negative control) with a 30:70 fish to vegetable protein- lipid ratios. All diets were formulated to be similar in crude protein (45% DM) and lipid content (17% DM). Each feed was offered to visual satiety to triplicate groups of sea bass (204 g initial size) over 15 weeks under controlled rearing conditions (temperature 21°C; salinity 28 psu; light-dark cycle 12L:12D) according to a randomized design. Fish given the positive control feed and those fed diets including graded levels of microalgae showed similar growth performance and feed conversion ratios which were significantly better than those attained by fish fed the negative control diet (B.W. 420 vs. 388 g, SGR 0.69 vs. 0.61, FCR, 1.7 vs. 1.9, p<0.05). The effects of the dietary microalgae inclusion on fillet proximate and fatty acid composition were also considered.
Growth and Body Composition of Sea Bass Fed Diets Including Graded Levels of a Blend of Two marine Microalgae in Low Fish meal/Oil Diets / Poli B.M.; Bruno B.; Chini Zittelli G.; Giorgi G. Galigani I.; Tredici M. R.; Tibaldi E.. - ELETTRONICO. - 43:(2013), pp. 3-3. (Intervento presentato al convegno 43rd WEFTA meeting, Seafood innivations throughout the value chain tenutosi a Tromso, Norway nel 9-11 October 2013).
Growth and Body Composition of Sea Bass Fed Diets Including Graded Levels of a Blend of Two marine Microalgae in Low Fish meal/Oil Diets
POLI, BIANCA MARIA;GIORGI, GIANLUCA;TREDICI, MARIO;
2013
Abstract
For a sustainable aquaculture industry, current levels of fish meals/oils in aquafeeds need to be drastically reduced and mostly replaced by vegetable counterparts. In this contest, the use of marine microalgae in aquafeeds has recently attracted much scientific attention due to their high protein content and lipid levels, including ω-3 long-chain PUFAs. Microalgae produced under controlled conditions in novel photobioreactors can supply biomass of constant and suitable quality to be included in aquafeeds at relatively competitive costs. In the present study, we investigated the growth performance and body composition of sea bass (Dicentrarchus labrax L.) in response to diets where graded levels of a blend of two marine microalgae were included in low fish meal/oil diets. A blend of dried biomass of Isochrysis aff. galbana (T-ISO) and Tetraselmis suecica in a 2:1 w:w ratio, was used to replace 15, 30 and 45% fish meal protein of a positive control diet with a 50:50 fish to vegetable protein-lipid ratios. The microalgae-containing aquafeeds were also compared to a diet (negative control) with a 30:70 fish to vegetable protein- lipid ratios. All diets were formulated to be similar in crude protein (45% DM) and lipid content (17% DM). Each feed was offered to visual satiety to triplicate groups of sea bass (204 g initial size) over 15 weeks under controlled rearing conditions (temperature 21°C; salinity 28 psu; light-dark cycle 12L:12D) according to a randomized design. Fish given the positive control feed and those fed diets including graded levels of microalgae showed similar growth performance and feed conversion ratios which were significantly better than those attained by fish fed the negative control diet (B.W. 420 vs. 388 g, SGR 0.69 vs. 0.61, FCR, 1.7 vs. 1.9, p<0.05). The effects of the dietary microalgae inclusion on fillet proximate and fatty acid composition were also considered.
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