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

• Published in: Scientific Reports
• Main Authors: Egerton, S., Wan, A., Murphy, K., Collins, F., Ahern, G., Sugrue, I., Busca, K., Egan, F., Muller, Nils, Whooley, J., Mcginnity, P., Culloty, S., Ross, R. P., Stanton, C.
• Other Authors: School of Physics, National University of Ireland, Astrophysics Research Group, School of Physics Dublin, Trinity College Dublin, APC Microbiome, School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland, Biomarine Ingredients Ireland Ltd., Monaghan, Ireland
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2020
• Subjects: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]; Atlantic salmon; Salmo salar
• Online Access: https://hal.science/hal-03742717; https://doi.org/10.1038/s41598-020-60325-7

International audience 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 ?-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.