GREEN RIVER— Air and water temperatures are warming, and the Wyoming Game and Fish Department’s Green River fish management staff is concerned about the impacts of catch-and-release fishing on local fisheries, especially kokanee salmon at Flaming Gorge Reservoir. As temperatures continue to warm in July and August, the survival of released kokanee decreases. Even though some released kokanee swim away, many likely die following the stress of the fight and exposure to lethal water temperatures.

As summer progresses, the Flaming Gorge Reservoir surface water temperatures will continue to increase, rapidly reaching temperatures lethal to kokanee. Anglers fishing for kokanee during the summer months are encouraged to stop once they catch their limit of fish and switch to fishing for a different species. Anglers are also encouraged to target and harvest small lake trout.

“Most kokanee, this time of year, are caught from in or near the thermocline, where water temperatures are around 45-55°F. Once hooked, they are brought through the warming water column to surface temperatures between 65-75°F. Being caught and released in the warm surface water is stressful for fish. Pulling a cold water species like kokanee from 45°F to 65°F water is life-threatening. Their chances of surviving if released are low.” Walrath stated. 

For more information about fishing at Flaming Gorge Reservoir, call the Green River Region Game and Fish Office at 307-875-3223. Anglers will find additional information on the Flaming Gorge Management page.