Hybrid sturgeon 'AL' (Acipenser naccarii×Acipenser baeri) diets: The use of alternative plant protein sources

In this experimentation, corn gluten (CG) and pea meal (PM) were tested as potential protein sources in hybrid sturgeon 'AL'. One hundred and twenty-eight hybrid sturgeons 'AL' (Acipenser naccarii × Acipenser baeri) (initial body weight 364.8 ± 4.5 g) were utilized with four experimental diets and four replicates each; the experimental design was 4 × 4. Four isonitrogenous [crude protein=40% dry matter (DM)] and isoenergetic (gross energy=20 MJ kg-1 DM) diets were formulated containing different levels of CG with or without PM and tested against a control diet that was fish meal (FM) based. Diets were as follows: CG55 contained 55% of corn gluten; diet CG55PM25 contained 55% CG and 25% PM; diet CG45PM25 contained 45% of corn meal and 25% of PM; and diet FM was control, based on FM. Fish fed with the PM diet showed lower values of feed conversion ratio (FCR) and specific growth rate (SGR) (FCR=4.53 ± 2.51 in the CG55PM25 diet; FCR=4.09 ± 1.45 in the CG45PM25 diet; SGR=0.20 ± 0.07 in the CG55PM25 diet; SGR=0.19 ± 0.11 in the CG55PM25 diet). The results of tissue proximate composition confirmed the results obtained from productive traits. This study indicates that CG meal but not PM could be utilized as a substitute of FM in hybrid sturgeon 'AL' nutrition. Parole chiave: sturgeon feeding; corn gluten; pea meal; growth performances; body composition