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- Title
A generalized application of the catch-curve regression with comparisons of adult mortality and year-class strength between hatchery-stocked and wild-reared lake trout in US waters of Lake Huron.
- Authors
He, Ji X.; Madenjian, Charles P.; Wills, Todd C.
- Abstract
The recently developed approach to estimating the instantaneous total mortality of coded-wire-tagged lake trout (Salvelinus namaycush) is generally applicable to catch-at-age data. We further formalized the technique to objectively incorporate the year-class and year effects into the model structure of catch-curve regression. We used this new method to compare adult mortality and year-class strength between the hatchery-stocked and wild-reared lake trout in US waters of Lake Huron, one of the Laurentian Great Lakes. Model comparisons showed no difference in adult mortality between the hatchery-stocked and wild-reared lake trout. Based on 95% confidence intervals, the estimate of adult mortality using the simple catch-curve regression with average number-at-age was not statistically different from the estimate using the linear mixed model with individual number-at-age of multiple year-classes and sampling years. The linear mixed model, however, also quantified lake trout year-class strength and indicated that since 2003, the increases in recruitment of wild-reared lake trout did not fully compensate for the rapid declines in recruitment of hatchery-stocked lake trout in Lake Huron.
- Subjects
LAKE trout; HATCHERY fishes; LAKES; MORTALITY; ADULTS; CONFIDENCE intervals
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2023, Vol 80, Issue 10, p1714
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2022-0275