Alternative protein blends as a replacement for fish meal in diets for white seabass,Atractoscion nobilis |
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| Authors: | D Jirsa FT Barrows RW Hardy M Drawbridge |
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| Institution: | 1. Hubbs‐SeaWorld Research Institute, San Diego, CA, USA;2. United States Department of Agriculture, Agriculture Research Service, Bozeman, MT, USA;3. Aquaculture Research Institute, University of Idaho, Hagerman, ID, USA |
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| Abstract: | An 8‐week feeding trial was conducted to determine the effectiveness of replacing fish meal (FM) with blends of alternative proteins in diets for white seabass (WSB, Atractoscion nobilis) at a starting weight of 5.6 g. Five diets were formulated with 400–440g kg?1 crude protein (380g kg?1 digestible). These included a high 520g kg?1 FM control diet, a series of three diets with a sequential replacement of FM containing 410g kg?1, 510g kg?1 and 630g kg?1 of a soy‐based protein blend (SPC) and 200g kg?1, 100g kg?1 and 0g kg?1 FM, respectively and a fifth diet containing 550g kg?1 of a corn‐based protein blend (CGM) and 100g kg?1 FM. Survival was highest in the FM control group at 99% but all other performance measures (weight gain, feed conversion ratio, specific growth rate and protein retention efficiency) were worse than the other treatment groups. Weight gain reached a maximum of 595% in the SPC 200g kg?1 FM treatment group. Performance decreased as inclusion of the soy‐based protein blend increased. The CGM treatment performed comparably to the SPC 100g kg?1 FM treatment among all measures, except for survival, which was higher in the CGM 100g kg?1 FM treatment. With nutrient levels and alternative protein blends used in this study, FM can be reduced to 100g kg?1 of the diet for WSB without reductions in performance. |
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| Keywords: | alternative proteins atractoscion nobilis diet finfish fish meal replacement nutrition |
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