alexa A History and Evaluation of Regulations for Brook Trout and Brown Trout in Michigan Streams
Agri and Aquaculture

Agri and Aquaculture

Fisheries and Aquaculture Journal

Author(s): Richard D Clark JR

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Since establishment of the Board of Fish Commissioners in 1873, the trend in Michigan trout fishing regulations has been toward more restrictive and complex laws. Major scientific investigations concerning the effectiveness of various types of regulations began in 1945. Those studies indicated that a minimum size limit was the most effective regulation for controlling exploitation of trout. In this study, minimum size limits for brook trout (Salvelinus fontinalis) and brown trout (Salmo trutta) in Michigan streams were evaluated through mathematical modeling. Minimum size limits ranging from 152 to 229 mm were tested for brook trout and from 152 to 305 mm for brown trout. Catch-and-release (no-kill) regulations were also simulated for both species. Maximum yield in numbers and weight of trout harvested (legal-size fish killed) was obtained at a 152-mm minimum limit for both species. Yield in numbers and weight of trout caught and released (sublegal fish returned to water alive) increased as size limit increased and was maximum with a no-kill regulation. Total yield (defined as weight of trout caught and harvested plus weight of trout caught and released) increased as size limit increased and was maximum with a no-kill regulation. As size limit increased, the number of larger trout harvested increased but, at the same time, total number of trout harvested declined.

This article was published in North American Journal of Fisheries Management and referenced in Fisheries and Aquaculture Journal

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