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Influence of dietary fat level and whole-body adiposity on voluntary energy intake by juvenile rainbow trout Oncorhynchus mykiss (Walbaum) under self-feeding conditions

2002; Wiley; Volume: 33; Issue: 9 Linguagem: Inglês

10.1046/j.1365-2109.2002.00708.x

1365-2109

Takeshi Yamamoto, T Shima, Hirofumi Furuita, Nobuhiro Suzuki,

Animal Nutrition and Physiology

Aquaculture ResearchVolume 33, Issue 9 p. 715-723 Influence of dietary fat level and whole-body adiposity on voluntary energy intake by juvenile rainbow trout Oncorhynchus mykiss (Walbaum) under self-feeding conditions T Yamamoto, T Yamamoto Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie, JapanSearch for more papers by this authorT Shima, T Shima Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie, JapanSearch for more papers by this authorH Furuita, H Furuita Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie, JapanSearch for more papers by this authorN Suzuki, N Suzuki Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie, JapanSearch for more papers by this author T Yamamoto, T Yamamoto Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie, JapanSearch for more papers by this authorT Shima, T Shima Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie, JapanSearch for more papers by this authorH Furuita, H Furuita Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie, JapanSearch for more papers by this authorN Suzuki, N Suzuki Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie, JapanSearch for more papers by this author First published: 08 July 2002 https://doi.org/10.1046/j.1365-2109.2002.00708.xCitations: 13 T Yamamoto, Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie 519-0423, Japan. E-mail: takejpn@fra.affrc.go.jp Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract The influence of dietary fat level and whole-body adiposity on voluntary energy intake of juvenile rainbow trout Oncorhynchus mykiss (Walbaum) was examined using self-feeders. Groups of lean fish [crude fat (CF) = 7%] and fat fish (CF = 11%), pretreated with a commercial diet with or without supplemental pollock oil, were self-fed one of three fat level diets (CF = 8%, 13.5% and 19%) for 48 days at 17 °C. Final body weight (BW) and total digestible energy (DE) intake (kJ per fish) were positively affected by the initial BW. Relative to the initial BW, however, fat fish consumed less DE than lean fish. Although the effect of dietary fat level was not significant, percentage weight gain and daily DE intake per BW (kJ kg−1 BW day−1) of fat fish were significantly lower than those of lean fish (ancova with initial BW as a covariate, P < 0.05). Energy digestibility, feed efficiency and protein retention were improved with the dietary fat level; however, there was no difference resulting from body fat level. The whole-body fat levels at the end of the experiment increased with the dietary fat level. Between groups self-fed the same diet, fat levels of the initially fat fish were still higher than those of the lean fish. The results of the present medium-term study suggest that rainbow trout adjust DE intake from diets with fat levels ranging from 8% to 19%. Although body fat level affects neither energy digestibility nor protein utilization, a high body fat level may reduce DE intake and consequently depress growth. Citing Literature Volume33, Issue9July 2002Pages 715-723 RelatedInformation