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.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0719106-114817 |
| Date | 19 July 2006 |
| Creators | Chen, Wei-chih |
| Contributors | Houng-Yung Chen, Tzyy-Ing Chen, Li-Lian Liu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719106-114817 |
| Rights | unrestricted, Copyright information available at source archive |
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