Optimization of the supplemental essential amino acids to a fish meal-free diet based on fermented soybean meal for rainbow trout <Emphasis Type="Italic">Oncorhynchus mykiss</Emphasis> |
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| Authors: | Takeshi Yamamoto Hiroyuki Matsunari Tsuyoshi Sugita Hirofumi Furuita Toshiro Masumoto Yasuro Iwashita Shunji Amano Nobuhiro Suzuki |
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| Institution: | (1) Tamaki Station, National Research Institute of Aquaculture, Fisheries Research Agency, Hiruta, Tamaki Mie, 519-0423, Japan;(2) Laboratory of Fish Nutrition, Faculty of Agriculture, Kochi University, Monobe, Nankoku Kochi, 783-8502, Japan;(3) Department of Fisheries, School of Marine Science and Technology, Tokai University, Shimizu Shizuoka, 424-8610, Japan |
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| 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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