Lake Trout

Credit: Wisconsin Sea Grant

Taste and Nutrition

Lake trout have roughly the same amount of omega-3 fatty acids (EPA and DHA) as sockeye salmon. The flesh of lake trout is firm, rich in flavor and white to red (often orange) in color. It is oily and is often enjoyed smoked.

How They Are Harvested

Lake trout are harvested using gill nets, and most come from Lake Superior and Lake Erie. Lake trout is the only fish species subject to harvest limits in the Wisconsin waters of Lake Superior, where the total allowable catch is divided among tribal commercial fisheries, state-licensed commercial fisheries, tribal subsistence fishers and state recreational anglers. State and tribal biologists work together to monitor the lake trout population and adjust the allowable catch as needed.

Consumption Advice

State health agencies have found that it is safe to eat Great Lakes lake trout once a month.

Visit these links to find out more information about fish advisories in Wisconsin and the Great Lakes:
Wisconsin Department of Natural Resources: Eating Your Catch
2014 Ohio Sport Fish Health and Consumption Advisory

Biology and History

Lake trout were historically the top Great Lakes predator. They generally live at or near the bottom of the lake, but some may also occur in the open water, far offshore. Because they are solitary fish that hunt alone, they are more difficult to catch commercially than whitefish and yellow perch.

Lake trout may live as long as 20 years. It is the largest of all the trout; the average lake trout generally weighs 7-12 lbs., but the record fish taken from Wisconsin waters is a 47-lb. specimen caught in Lake Superior in 1946.

Historically, lake trout, along with whitefish, sturgeon and herring, were one of the “big four” species of Great Lakes commercial fishing. As early as the 1880s, lake trout numbers began declining, probably due to overfishing and pollution of their spawning areas. However, it was the invasive sea lamprey that nearly wiped out lake trout when the lamprey entered the Upper Great Lakes in the 1930s. Today, Lake Superior supports the only remaining naturally sustaining population of lake trout in the Great Lakes.

Lake trout are a favorite target of sea lamprey, eel-shaped parasitic fish that have no natural predators in the Great Lakes. Sea lamprey have been managed since 1960 by using the selective chemical TFM that kills young lamprey in streams and rivers. This keeps lamprey numbers low, but without continuous treatment the lamprey population would explode again. After TFM treatments lowered the numbers of lamprey, fisheries biologists began restocking the Great Lakes with lake trout. Some remnant wild lake trout populations in Lake Superior remained, and they eventually fully recovered. However, wild lake trout were completely eliminated from Lake Michigan. The lake trout rehabilitation program in Lake Michigan, coordinated by the Great Lakes Fishery Commission, began in 1965. Since then, 2-3 million yearling lake trout have been stocked each year, funded by the federal government. The fish grew well to adult size, but they failed to reproduce. Finally, in 2013, the Green Bay office of the U.S. Fish and Wildlife Service announced the discovery of a significant number of young and wild lake trout in several areas of Lake Michigan. It appears that lake trout are finally reproducing again in Lake Michigan. While it will still take significant effort to completely restore the population, this is an important step forward.

Research

Warming Lake Superior: Cheers Some Sport Fish, Challenges Others






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