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Effects of replacing fish oil with linseed oil or corn oil on growth, fatty acid metabolism and immune responses of juvenile cobia Rachycentron canadum

The effects of partial or total replacement of fish oil with linseed oil or corn oil or both in diets of cobia were valuated. Basal diet was isonitrogenous and isoenergetic and contained 15% crude lipid. Results of the 8-wk feeding trial show that fish fed diet containing only fish oil grew significant better than fish fed other replacement diets (replacement level 33-100%). Fish fed diet containing only plant oil grew the least and had the lowest liver weight, condition factor and body lipid concentration. Oil replacement did not significantly change liver mRNA gene expression of fatty acid desaturase and elongase. As levels of replacement increased, tissue PUFA increased while HUFA decreased. Fish fed all fish oil diet had the highest respiratory burst activities of head kidney phagocytes. Serum of the fish fed the all vegetable oil diets had the lowest lysozyme activities. Fish fed all linseed oil diet had the highest SOD activities. Serum alternative complement pathway activity, aspartate transaminase and alanine transaminase activity did not vary among treatments. The results show that cobia juveniles had relatively high need for fish oil in their diets, and the ability to synthesized HUFA from PUFA was limited. Partial or total replacement (33-100%) of fish oil with linseed oil or corn oil or both were detrimental to fish growth and immune responses.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0719106-114817
Date19 July 2006
CreatorsChen, Wei-chih
ContributorsHoung-Yung Chen, Tzyy-Ing Chen, Li-Lian Liu
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719106-114817
Rightsunrestricted, Copyright information available at source archive

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