Effects of methionine supplementation in plant protein based diet on growth performance and fillet quality of juveniles Yellow River carp (Cyprinus carpio haematopterus)

The 65 days rearing experiment was carried out to investigate the effects of dietary methionine (Met) levels on growth performance and fillet quality of juveniles Yellow River carp, Cyprinus carpio haematopterus. Five diets containing 6.04 g/kg, 9.31 g/kg, 12.09 g/kg, 15.66 g/kg and 18.05 g/kg Met (Met 6.04, Met 9.31, Met 12.09, Met 15.66 and Met 18.05) were respectively fed to experimental carps (initial weight: 21.56 ± 0.46 g) with three replicates per group. The percentage weight gain (PWG), specific growth rate (SGR), feed efficiency (FE), protein efficiency (PE) and condition factor (CF) all elevated at first and then decreased with the increase of dietary Met levels, and all reached the maximum in Met 12.09 group (P