Abstract
To minimize the supplemental essential amino acids (EAAs) to a fish meal-free diet for rainbow trout Oncorhynchus mykiss, four types of fish meal-free diets and a control fish meal-based diet were fed to triplicate groups of trout (initial BW, 16 g) for 10 weeks. Two fish meal-free diets based on a fermented and an unfermented soybean meal were unsupplemented with EAAs (diet FSBM and SBM), and two fish meal-free diets based on the fermented soybean meal were supplemented with a combination of lysine and methionine (diet F + ML) and all EAAs (diet F + All), the EAA contents of which were lower than those of the control diet (diet FM). Although physiological conditions such as the biliary bile acid status and morphological features of fish fed diet FSBM were improved and similar to those of fish fed diet FM, the growth performance was not significantly different (P > 0.05) from fish fed diet SBM. The growth performances and whole body protein contents of fish fed F + ML and F + All diets were similarly improved compared to fish fed diet FSBM. These findings indicate that supplementation of lysine and methionine to a fermented soybean meal-based fish meal-free diet is enough to maximize the amino acid utilization of the diet.
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This study was financially supported in part by the Fisheries Agency and the Ministry of Education, Culture, Sports, Science and Technology, Government of Japan.
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Yamamoto, T., Matsunari, H., Sugita, T. et al. Optimization of the supplemental essential amino acids to a fish meal-free diet based on fermented soybean meal for rainbow trout Oncorhynchus mykiss . Fish Sci 78, 359–366 (2012). https://doi.org/10.1007/s12562-011-0456-2
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DOI: https://doi.org/10.1007/s12562-011-0456-2