| Abstract: | A 2 X 2 factorial experiment of diet type (krill vs. fish meal) and steroid supplementation (0 vs. 30 ??g 17??-methyltestosterone kg-1) was conducted to determine the effects on dorsal fin erosion in steelhead trout. Triplicate tanks of 250 fry were fed one of the four diets at a rate calculated to produce 115 g fish in 34 weeks. Fish were transferred to larger tanks when mean density index reached 0.40. Dorsal fin index (DFI, measured as mean dorsal fin height X 100/total fish length) was greater (P < 0.001) among fish fed krill-based diets than for fish fed fish-based diets at weeks 12, 22, and 34 of the trial. Added testosterone decreased (p = 0.04) DFI among fish fed the krill diet at week 12 but otherwise had no effect on fin condition. Addition of testosterone to either diet type decreased (P = 0.02) critical thermal maximum, which is a measure of fish resistance to thermal stress. The results suggest that diet composition can influence the rate of dorsal fin erosion in steelhead trout through a metabolic, behavioral, or combined change. |
| Genre: | Article |
| ProdID: | 70019536 |
| Citation Author: | Lellis, W. A.; Barrows, F. T. |
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| Citation End Page: | 240 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Aquaculture |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | The effect of diet on dorsal fin erosion in steelhead trout (Oncorhynchus mykiss); 1997; Article; Journal; Aquaculture; Lellis, W. A.; Barrows, F. T. |
| Citation Start Page: | 229 |
| Citation Volume: | 156 |
| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | The effect of diet on dorsal fin erosion in steelhead trout (Oncorhynchus mykiss); 1997; Article; Journal; Aquaculture; Lellis, W. A.; Barrows, F. T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S0044-8486(97)00133-6 |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
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