Estimating Potential Yield And Harvest Of Lake Trout Salvelinus Namaycush In Minnesotas Lake Trout Lakes Exclusive Of Lake Superior PDF Download

The primary objectives of this study are to estimate the abundance and length composition of lake trout Salvelinus namaycush in the Tangle Lakes system and to update the sustainable harvest level using the Lake Area model. Abundance and length composition will be estimated for the portion of the population that is susceptible to capture with hook-and-line sampling gear. To estimate abundance, two-event mark-recapture experiments for closed populations will be conducted on lakes within the Tangle Lakes system. Fish will be captured and marked in Lower Tangle Lake in April 2023 and in Upper, Round, Shallow, and Lower Tangle Lakes in June 2023. Recapture events will occur at the respective lakes in April and June 2024. The weights of fish captured with common sport fishing gear during the June sampling events will be used to estimate the number of fish that can be sustainably harvested on an annual basis using the Lake Area model. Abundance estimates will be generated for individual lakes or groups of lakes based on the movements of recaptured fish and results from a concurrent telemetry study. Abundance estimates will be compared to the updated estimate of sustainable harvest level and to estimates of catch and harvest generated by the Alaska Sport Fishing Statewide Harvest Survey to determine if current harvest limits and regulations are appropriate.