Open AccessDietary supplementation of β‐glucan improves growth performance, the innate immune response and stress resistance of red sea bream, P agrus major
Author(s) -
Dawood M.A.O.,
Koshio S.,
Ishikawa M.,
Yokoyama S.,
El Basuini M.F.,
Hossain M.S.,
Nhu T.H.,
Moss A.S.,
Dossou S.,
Wei H.
Publication year - 2017
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12376
Subject(s) - lysozyme , pagrus major , biology , glucan , weight gain , food science , zoology , transaminase , feed conversion ratio , immune system , salinity , medicine , endocrinology , body weight , biochemistry , fish <actinopterygii> , immunology , enzyme , fishery , ecology
A 56‐day feeding trial was conducted to evaluate the effects of supplemented diets with β‐glucan ( BG ) at four levels [0 ( D 1), 250 ( D 2), 500 ( D 3) and 1000 ( D 4) mg BG kg −1 ] on red sea bream, P agrus major . The obtained results revealed a significant increase ( P < 0.05) in final body weight, weight gain, specific growth rate, feed intake, body protein content, lysozyme activity and tolerance against low‐salinity stress test in all BG ‐supplemented groups when compared with BG ‐free group. Furthermore, D 4 group resulted in a significant increase in feed efficiency ratio, protein gain, protein and lipid digestibilities, serum bactericidal activity and peroxidase content when compared with D 1 group ( P < 0.05). Haematocrit and plasma protein content in D 3 group were significantly higher than those in D 1 group ( P < 0.05). Interestingly, BG supplementation decreased glutamic oxaloacetic transaminase ( GOT ) in D 2 group and reactive oxygen metabolites in D 2, D 3 and D 4 groups when compared with D 1 group. Following low‐salinity stress test, significantly higher amounts of secreted mucus were observed in fish fed D 2 and D 4 diets than those from fish fed D 1 diet ( P < 0.05). In conclusion, the supplementation of BG improves growth, stress resistance and immune response of P . major .