Open AccessDietary Oil Sources on the Innate Immunity and Resistance of Nile Tilapia, Oreochromis niloticus , to Streptococcus agalactiae Challenge
Author(s) -
Ferreira Milena W.,
Costa Diego V. da,
Leal Carlos A. G.,
Figueiredo Henrique C. P.,
Rosa Priscila V.
Publication year - 2015
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.12192
Subject(s) - oreochromis , nile tilapia , biology , streptococcus agalactiae , lysozyme , fish oil , food science , tilapia , linseed oil , zoology , microbiology and biotechnology , fishery , biochemistry , fish <actinopterygii> , bacteria , streptococcus , genetics
The effect of different dietary oil sources on the innate immunity and resistance of Nile tilapia, Oreochromis niloticus , to Streptococcus agalactiae infection were evaluated. Fish were fed with diets containing different lipid sources (soybean oil [ SO ], corn oil, linseed oil [ LO ], fish oil [ FO ], and olive oil [ OO ]). Fish fed SO presented the highest ( P < 0.05) hematocrit and serum protein. LO and FO diets increased ( P < 0.05) the erythrocyte resistance to osmotic lysis in comparison with other treatments. Fish fed OO showed the highest ( P < 0.05) iron‐binding capacity and the lowest serum lysozyme and bactericidal activities ( P < 0.05). No difference ( P > 0.05) was found between diets in alternative complement activity. Fish fed the SO diet had the highest ( P < 0.05) survival rate against S. agalactiae challenge. In conclusion, diets with LO oil and FO , rich in ω‐3 fatty acids, and OO , rich in ω‐9 fatty acids, have an immunomodulatory effect in Nile tilapia juveniles. The use of SO in the Nile tilapia diet improved immune function and resistance against S. agalactiae .