Lake Trout Survival Release Study on Upper Great Lakes
A critical component of fisheries management is understanding what happens to fish when they are caught and released. Most recently the DNR has been looking specifically at what happens to lake trout after they are caught through a mortality assessment survey.
To ensure accurate data is being collected on fish being lost from angling, mortality estimates must include both fish harvested and fish that are released and then die as a result of fishing. The DNR’s Fisheries Division gathers this data through its creel clerk program. Creel clerks, stationed at Great Lakes ports throughout Michigan, measure lake trout that have been caught and released. The data are used in fish population models used to estimate harvest quotas for recreational and commercial fisheries.
“Underestimating mortality of angler-released fish will result in unreliable harvest quotas that are not protective of this important sport species,” said DNR fisheries research biologist Shawn Sitar. “Therefore, reliable estimates of the mortality of released fish are critical to the DNR’s management of lake trout.” Read more