The Ministry of Natural Resources will be conducting lake surveys in the Kenora, Fort Frances and Dryden areas over the next couple of months.
Spokesperson Bill Towill says they're collecting a wide variety of information.
"We're sampling the fish to understand the fish population in that lake," says Towill, "the structure of that lake and the overall health of the population."
Towill says the data is shared with the Ministry of the Environment for its annual guide for eating sports fish and used to make changes to local fishing regulations.