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Replacement of fish meal in juvenile channel catfish,Ictalurus punctatus,diets using a yeast‐derived protein source: the effects on weight gain,food conversion ratio,body composition and survival of catfish challenged with Edwardsiella ictaluri
Authors:BC PETERSON  NJ BOOTH  BB MANNING
Institution:1. USDA/ARS Catfish Genetics Research Unit, Thad Cochran National Warmwater Aquaculture Center, Stoneville, MS, USA;2. National Warmwater Aquaculture Center, Mississippi State University, Stoneville, MS, USA
Abstract:We examined the effects of a yeast‐derived protein source (NuPro®) as a replacement for menhaden fish meal on weight gain, specific growth rate (SGR), food conversion ratio (FCR), whole‐body composition and disease resistance in juvenile channel catfish (9.9 ± 0.2 g fish?1). NuPro® replaced fish meal at six levels (0, 25, 50, 75, 100 and 125 g kg?1 diet). Catfish were sampled for whole‐body composition and then challenged with the bacterium Edwardsiella ictaluri. Growth performance was negatively affected (P < 0.01) when NuPro® was added at 125 g kg?1 diet. The amount of whole‐body fat decreased (P < 0.05) when NuPro® was added at 75 g kg?1 or more of the diet. Regardless of the amount of NuPro® added, survival after challenge with E. ictaluri was similar among treatments. Results indicate that up to 100 g kg?1 of NuPro® can be added without negatively affecting growth performance. The yeast‐derived protein source used in this study is a sustainable protein alternative that could be used as a partial replacement for fish meal in juvenile channel catfish diets.
Keywords:channel catfish  disease  fish meal  growth  replacement  yeast
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