| Abstract: | In 1976, the Wisconsin Department of Natural Resources established a refuge for a nearly depleted population of lake trout (Salvelinus namaycush) at Gull Island Shoal, Lake Superior. The refuge was intended to reduce fishing mortality by protecting adult lake trout. We examined the growth dynamics of these lake trout during the period of recovery by comparing estimates of ndividual growth before and after the refuge was established. Our estimates are based on an annual mark-recapture survey conducted at the spawning area since 1969. We developed a model that allowed mean growth rates to differ among individuals of different sizes and that accommodated variation in growth rates of individuals of the same size. Likelihood ratio tests were used to determine if the mean growth increments of lake trout changed ater the refuge was established. Our results suggest that growth of mature lake trout (particularly wild fish) decreased significantly in the postrefuge period. This decreased growth may have been associated with a reduction in food availability. We also observed reductions in growth as wild fish grew older and larger, which suggests that the growth of these fish may be adequately approximated by a von Bertalanffy growth model if it becomes possible to obtain accurate ages. |
| Genre: | Article |
| ProdID: | 1000968 |
| Citation Author: | Fabrizio, Mary C.; Dorazio, Robert M.; Schram, Stephen T. |
| Citation Contributing Office: | Great Lakes Science Center |
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| Citation End Page: | 272 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Canadian Journal of Fisheries and Aquatic Sciences |
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| Citation Number Of Pages: | 10 |
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| Citation Phsyical Description: | p. 262-272 |
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| Citation Search Results Text: | Dynamics of individual growth in a recovering population of lake trout (Salvelinus namaycush); 2001; Article; Journal; Canadian Journal of Fisheries and Aquatic Sciences; Fabrizio, Mary C.; Dorazio, Robert M.; Schram, Stephen T. |
| Citation Start Page: | 262 |
| Citation Volume: | 58 |
| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Dynamics of individual growth in a recovering population of lake trout (Salvelinus namaycush); 2001; Article; Journal; Canadian Journal of Fisheries and Aquatic Sciences; Fabrizio, Mary C.; Dorazio, Robert M.; Schram, Stephen T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 2001 00:00 -0600 |
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