Optimization of Dietary Manganese for Rainbow Trout, Oncorhynchus mykiss, Fed a Plant‐based Diet

Juvenile rainbow trout were fed a plant‐based diet supplemented with inorganic Mn added at 0, 0.5, 1, 2, 4, 8, 16, or 32 mg/kg diet for 12 wk. Whole‐body Mn concentrations increased with increasing dietary levels. Rainbow trout fed 2–8 mg Mn/kg diet exhibited weight gain that was significantly highe...

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Bibliographic Details
Published in:Journal of the World Aquaculture Society 2018-02, Vol.49 (1), p.71-82
Main Authors: Welker, Thomas L., Overturf, Ken, Abernathy, Jason, Barrows, Frederic T., Gaylord, Gibson
Format: Article
Language:English
Subjects:
alternative protein
Bioavailability
Body weight gain
Conversion ratio
Diet
dietary requirement
Dietary supplements
Feed conversion
Fish
Food conversion
Freshwater fishes
Manganese
micromineral
Oncorhynchus mykiss
Optimization
Protein sources
Proteins
Salmon
Trout
Weight gain
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Summary:Juvenile rainbow trout were fed a plant‐based diet supplemented with inorganic Mn added at 0, 0.5, 1, 2, 4, 8, 16, or 32 mg/kg diet for 12 wk. Whole‐body Mn concentrations increased with increasing dietary levels. Rainbow trout fed 2–8 mg Mn/kg diet exhibited weight gain that was significantly higher than fish fed 0, 0.5, 1, 16, and 32 mg Mn/kg diet. Feed conversion ratio (FCR) showed a similar trend, where FCR values decreased with increasing dietary Mn until concentrations reached 8 mg Mn/kg, after which they increased. A rational nonlinear model (R2 = 0.84) fit to weight‐gain data showed that the optimal predicted supplementation level for Mn was 4.8 mg/kg diet. The optimal predicted supplementation level for Mn was similar for FCR (5 mg Mn/kg diet). The predicted 5 mg/kg diet of supplemental Mn required for the plant‐based diet formulation examined in this study is lower than the National Research Council–recommended supplementation level of 12 mg/kg. However, due to potential differences in bioavailability or retention of Mn among plant‐protein sources, the level of dietary supplementation for optimal growth could be slightly higher or lower depending on the dietary formulation.
ISSN:0893-8849
1749-7345
DOI:10.1111/jwas.12447