Comparison of Three Nonlinear Models to Describe Long-Term Tag Shedding by Lake Trout
- 1 March 1996
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 125 (2) , 261-273
- https://doi.org/10.1577/1548-8659(1996)125<0261:cotnmt>2.3.co;2
Abstract
We estimated long-term tag-shedding rates for lake trout Salvelinus namaycush using two existing models and a model we developed to account for the observed permanence of some tags. Because tag design changed over the course of the study, we examined tag-shedding rates for three types of numbered anchor tags (Floy tags FD-67, FD-67C, and FD-68BC) and an unprinted anchor tag (FD-67F). Lake trout from the Gull Island Shoal region, Lake Superior, were double-tagged, and subsequent recaptures were monitored in annual surveys conducted from 1974 to 1992. We modeled tag-shedding rates, using time at liberty and probabilities of tag shedding estimated from fish released in 1974 and 1978–1983 and later recaptured. Long-term shedding of numbered anchor tags in lake trout was best described by a nonlinear model with two parameters: an instantaneous tag-shedding rate and a constant representing the proportion of tags that were never shed. Although our estimates of annual shedding rates varied with tag type ...Keywords
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