碩士 / 國立成功大學 / 生物學研究所 / 85 / Thermal biology of the freshwater fish, Varicohinus barbatulus, was investigated to understand (1) the effects of acclimation temperature on thermal preference, thermal tolerance, and polar lipid composition of muscle, and (2) the effects of dietary lipids on fatty acid composition of polar lipids in tissues, thermal preference, and thermal tolerance.
Fish were acclimated in laboratory condition at 12-27℃. Feed efficiency was highest at 22℃. When acclimation temperature increased from 12℃ to 27℃, the lower lethal temperature, the upper leathal temperature, and the preferred temperature increased from 0.25℃-4.75℃, 29.75℃-35℃, and 16.18℃-22.86℃, respectively. The final preferred temperature and the thermal niche of Varicohinus barbatulus is 19.95℃ and 17-21℃, respectively.
Highly unsaturated fatty acids (HUFA) of the polar lipids in muscle decreased from 35.44% at 12℃ to 30.93℃ at 27℃ acclimation. Content of polyunsaturated fatty acids (PUFA) of the polar lipids in the fish without dietary fish oil was hightest in muscle (28.43%), and was lowest in brain (10.84%). PUFA contents of the polar lipids increased 8.8%, 11.79%, and 14.69% in muscle, liver, and gill, respectively. However, PUFA content in brain and the mean preferred temperature were not affected by addition of dietary fish oil. All the fish without dietary fish oil showed unbalanced swimming, while 20% of the fish with dietary fish oil swam normally at 6℃, suggesting dietary fish oil slightly increased thermal tolerance of the fish.
| Identifer | oai:union.ndltd.org:TW/085NCKU3112001 |
| Date | January 1997 |
| Creators | 吳清福 |
| Contributors | 侯平君 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 46 |
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