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Increasing Fish Oil Levels in Commercial Diets Influences Hematological and Immunological Responses of Channel Catfish, Ictalurus punctatus

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Growth performance, immune responses and disease resistance were studied in juvenile channel catfish, Ictalurus punctatus, fed a commercial diet (35.3% crude protein and 5.6% lipid) supplemented with menhaden fish oil at levels of 0, 3, 6, and 9% for 15 wk. Dietary fish oil levels did not significantly influence growth performance of catfish. Fatty acid compositions of whole-body and liver reflected dietary fatty acid composition. No differences were found in hematological values, except that fish fed the 9% fish oil diet had significantly lower hematocrit. The resistance of erythrocytes to hemolysis in hypotonic solutions increased with increasing fish oil levels and the highest resistance was seen with the 9% fish oil diet. Fish fed 6 and 9% added fish oil diets had significantly higher serum protein levels than that of control fish. Serum lysozyme activity of fish fed 3 and 6% added fish oil diet was significantly higher than that of the control. Complement activity and chemotaxis ratio significantly decreased in fish fed diets with 6 or 9% added fish oil. The 3% added fish oil diet, however, had significantly highest natural hemolytic complement activity. Mortality from Edwardsiella ictaluri 14 d postchallenge and antibody titers to E. ictaluridid not differ among treatments.
Yildirim-Aksoy, Mediha , Lim, Chhorn , Shelby, Richard , Klesius, Phillip H.
Ictalurus punctatus , catfish , fish culture , fish feeding , fish oils , menhaden oil , hematology , immune response , Edwardsiella ictaluri , bacterial infections , mortality , animal growth , body composition , fatty acid composition
p. 76-86.
Includes references
Journal of the World Aquaculture Society 2009 Feb., v. 40, no. 1
Malden, USA : Blackwell Publishing Inc
Journal Articles, USDA Authors, Peer-Reviewed
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