Open AccessEvaluating the Effects of Dietary Prebiotic Mixture of Mannan Oligosaccharide and Poly‐β‐Hydroxybutyrate on the Growth Performance, Immunity, and Survival of Rainbow Trout, Oncorhynchus mykiss (Walbaum 1792), Fingerlings
Author(s) -
H. Najdegerami Ebrahim,
Tokmachi Amir,
Bakhshi Farideh
Publication year - 2017
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/jwas.12356
Subject(s) - rainbow trout , biology , prebiotic , mannan , food science , immunostimulant , feed conversion ratio , lysozyme , pepsin , oligosaccharide , immune system , fish <actinopterygii> , biochemistry , enzyme , fishery , immunology , polysaccharide , endocrinology , body weight
This study investigated the effects of dietary poly‐β‐hydroxybutyrate ( PHB ) and mannan oligosaccharide ( MOS ) on the growth performance, digestive enzyme activities, and disease resistance of rainbow trout fingerlings. A total of 420 fingerlings, distributed equally into four different groups, each with three replicates, were fed a basal diet (control), 2% PHB ( PHB ), 0.2% MOS ( MOS ), or a diet supplemented with a mixture of 2% PHB and 0.2% MOS ( PHB + MOS ) for 60 d. Results showed that dietary PHB and/or MOS did not cause significant improvement in the growth performance of the fingerlings. The gut pH was markedly reduced; however, the activities of the digestive enzymes (except for pepsin and amylase by dietary PHB ) were not significantly improved by the dietary supplements. Results also showed that dietary PHB and/or MOS markedly increased the resistance of the fingerlings toward Yersinia ruckeri infection, while the lowest total antibody was observed in fish fed control and MOS , indicating that MOS exerts its protective effects by modulating other mechanisms. Overall, this study provided a first screening effort to determine the effects of PHB and/or MOS as dietary supplements in rainbow trout fingerlings to develop an optimal prebiotic mix for improving the growth and health status of rainbow trout.