Atlantic salmon grow successfully on 80% plant protein diet when supplemented with fish hydrolysate

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% fish meal (FM), (b) an 80% plant protein diet with 15% fish meal (PL), (c) an 80% plant protein with 5% fish meal and 10% partly hydrolysed fish (PHP), or (d) an 80% plant protein diet with 5% fish meal and 10% soluble protein hydolysate (SPH). After 12 weeks of dietary intervention it was found that gut morphology showed no signs on enteritis, while plant protein significantly altered the composition of fish gut microbiota.