Effect of L-Hyp supplementation on collagen muscle histology, gene expression, growth performance, body composition and fillet texture on big size European sea bass (Dicentrarchux labrax)

•Hydroxyproline increase growth rates in large sea bass.•Hydroxyproline supplementation increase Type I collagen deposition.•New insights about immunohistochemistry for collagen determination.•Hydroxyproline inclusion induces an over expression of COL I in the muscle of sea bass.•Hydroxyproline increased performances of high plant protein diets.