Egerton, Sian; Wan, Alex; Kiera; Collins, Fergus W. J.; Ahern, Grace; Sugrue, Ivan; Busca, KizKitza; Egan, Fintan; Muller, Niall; Whooley, Jason; McGinnity, Philip; Culloty, Sarah C.; Ross, R. Paul; Stanton, Catherine

2020

December

Scientific Reports

Replacing fishmeal with plant protein in Atlantic salmon (Salmo salar) diets by supplementation with fish protein hydrolysate

Published

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Fishmeal Plant protein Atlantic salmon Salmo salar Fish protein hydrolysate

10

© 2020, The Author(s). The effects of feeding an 80% plant protein diet, with and without fish protein hydrolysate (FPH) supplementation, on the growth and gut health of Atlantic salmon were investigated. Fish were fed either (A) a control diet containing 35% fishmeal, (B) an 80% plant protein diet with 15% fishmeal, (C) an 80% plant protein diet with 5% fishmeal and 10% partly hydrolysed protein, or (D) an 80% plant protein diet with 5% fishmeal and 10% soluble protein hydrolysate. Fish on the 80% plant- 15% fishmeal diet were significantly smaller than fish in the other dietary groups. However, partly-hydrolysed protein supplementation allowed fish to grow as well as fish fed the control 35% fishmeal diet. Fish fed the FPH diets (diets C and D) had significantly higher levels of amino acids in their blood, including 48% and 27% more branched chain amino acids compared to fish on the 35% fishmeal diet, respectively. Plant protein significantly altered gut microbial composition, significantly decreasing a-diversity. Spirochaetes and the families Moritellaceae, Psychromonadaceae, Helicobacteraceae and Bacteroidaceae were all found at significantly lower abundances in the groups fed 80% plant protein diets compared to the control fishmeal diet.

2045-2322

10.1038/s41598-020-60325-7