Open AccessGrowth, Body Fatty Acid Composition, Immune Response, and Resistance to Streptococcus iniae of Hybrid Tilapia, Oreochromis niloticus × Oreochromis aureus , Fed Diets Containing Various Levels of Linoleic and Linolenic Acids
Author(s) -
Li Erchao,
Lim Chhorn,
Klesius Phillip H,
Welker Thomas L
Publication year - 2013
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.12014
Subject(s) - streptococcus iniae , biology , oreochromis , tilapia , linoleic acid , food science , immune system , zoology , fatty acid , biochemistry , immunology , fish <actinopterygii> , fishery
The effects of dietary linoleic ( LA ) and linolenic acids ( LN ) on growth and immunity of all‐male hybrid tilapia, Oreochromis niloticus × Oreochromis aureus , were evaluated for 10 wk. Fish fed 0.12% LA + 0% LN had the lowest weight gain ( WG ) but was not significantly different from diets containing 0.5% LA or 0.40% LA + 1.0% LN . Fish fed 1% LA had the highest WG but did not differ from diets with 0.5% LA , 2.0% LA , 0.26% LA + 0.5% LN , 0.69% LA + 2.0% LN , or diets containing both LA and LN at 0.25, 0.5, and 1.0%. Feed intake, feed efficiency, and survival did not differ among treatments. Total body n‐6 fatty acids ( FAs ) increased with increasing dietary levels of n‐6. Total body n‐3 FAs also appeared to increase with increasing dietary n‐3 levels but peaked at 1% of diet. Dietary treatment had no effect on hematology, immune function, or survival to Streptococcus iniae . This study indicates that both LA and LN are dietary essential for growth of hybrid tilapia. Dietary LA alone can meet the essential FA requirement, and a level of 1.14% of diet is required for optimum growth.