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United States Department of Agriculture

Agricultural Research Service

Research Project: INTEGRATION OF NUTRITIONAL, GENETIC AND PHYSIOLOGICAL APPROACHES TO IMPROVE PRODUCTION EFFICIENCY OF RAINBOW TROUT

Location: Small Grains and Potato Germplasm Research

Title: Supplementation of plant-based diets for rainbow trout, Oncorhynchus mykiss with macro-minerals and inositol.

Authors
item Barrows, Frederic
item Gaylord, Thomas
item Sealey, Wendy -
item Smith, Charlie -
item Porter, Lucas -

Submitted to: Aquaculture Nutrition
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: August 13, 2009
Publication Date: September 1, 2009
Repository URL: http://riley.nal.usda.gov/nal_web/digi/submission.html
Citation: Barrows, F.T., Gaylord, T.G., Sealey, W.M., Porter, L., Smith, C.E. Supplementation of plant-based diets for rainbow trout, Oncorhynchus mykiss with macro-minerals and inositol. Aquaculture Nutrition, on-line early, 2009.

Interpretive Summary: Replacement of fish meal with plant products in aquafeeds results in the elimination of dietary compounds which may be important for optimal growth and physiology. A study was conducted to determine if supplementation with macro-minerals and/or inositol would improve performance of rainbow trout fed a plant-based diet. Four diets with the same level of protein and fat (40% protein and 15% fat) were formulated and consisted of a fish meal-based control diet (control) and three plant-based experimental diets. Plant based diets were supplemented with either macro-minerals and inositol (+MM+I), no macro-minerals with inositol (-MM+I), and no macro-minerals and no inositol (-MM-I). Sodium chloride, potassium chloride and magnesium oxide were the sources used in the macro-mineral premix. There was no effect of diet on survival, but there was an effect of diet on weight gain, FCR, feed intake, HSI and nutrient retentions. Significant liver pathology was observed in trout fed plant-based diets without MM supplementation. Supplementation of MM and inositol significantly improved weight gain of trout fed a plant based diet. Supplementation of MM and/or inositol also improved PRE and ERE. This study demonstrates the importance of supplementing these nutrients to trout fed fish meal free diets.

Technical Abstract: Replacement of fish meal with plant products in aquafeeds results in the elimination of dietary compounds which may be important for optimal growth and physiology. A study was conducted to determine if supplementation with macro-minerals and/or inositol would improve performance of rainbow trout fed a plant-based diet. Four iso-caloric and iso-nitrogenous diets (40% protein and 15% lipid) were formulated and consisted of a fish meal-based control diet (control) and three plant-based experimental diets. Plant based diets were supplemented with either macro-minerals and inositol (+MM+I), no macro-minerals with inositol (-MM+I), and no macro-minerals and no inositol (-MM-I). Sodium chloride, potassium chloride and magnesium oxide were the sources used in the macro-mineral premix. There was no effect of diet on survival, but there was an effect of diet on weight gain, FCR, feed intake, HSI and nutrient retentions. Significant liver pathology was observed in trout fed plant-based diets without MM supplementation. Supplementation of MM and inositol significantly improved weight gain of trout fed a plant based diet. Supplementation of MM and/or inositol also improved PRE and ERE. This study demonstrates the importance of supplementing these nutrients to trout fed fish meal free diets.

Last Modified: 7/22/2014
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