Partial substitution of fishmeal with soybean meal products and derivatives in diets for the gilthead sea bream Sparus aurata (L.) |
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| Authors: | I Nengas M N Alexis S J Davies |
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| Institution: | National Centre for Marine Research, Aghios Kosmas, Helliniko, Athens, Greece;Fish Nutrition Unit, Department of Biological Sciences. University of Plymouth. Plymouth, Devon, United Kingdom |
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| Abstract: | Two growth trials were conducted to evaluate the nutritional quality of several soybean products as constituents in diets for the gilthead sea bream, Sparus aurata (L.). In a preliminary experiment, the fish were fed six diets containing different levels of solvent extracted soybean meal as a replacement for white fishmeal at four substitution levels: 10, 20, 30 and 40% of the fishmeal protein component. The diets supported less growth as the inclusion of soybean meal increased. However, significant reductions in growth were apparent at the 30% substitution level. All growth parameters followed the same trend. In the second experiment, six diets with 35% of the total protein contributed from differently processed soybean meals were tested. The products included three industrial full-fat meals heat processed for different periods, a solvent extracted meal and a soya protein concentrate. Protein digestibility coefficients were measured for all the experimental diets. All growth parameters of the fish fed the underheated full-fat meal, solvent extracted meal and soya concentrate were significantly lower than the control group. Protein digestibility coefficients were similar with no statistical differences (P < 0.05). |
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