It is generally illegal to sell wild game or fish in the US, so almost certainly if you are in the Lake Trout Capital of the World or the Ruffed Grouse Capital of the World (Park Falls, WI) you will not find any wild examples of those species for sale either in the markets or the restaurants.
Wild game found for sale is "wild" in name only; that elk loin or bobwhite quail breasts you've eaten were from animals raised on game farms and never lived a "wild" day in their life.
There are some exceptions with fish; some of the Indian tribes can commercially fish species like walleye in Minnesota, there is commercial fishing on Lake Michigan for whitefish plus commercial fishing on the ocean.
Animals determined to be "non-native" or "invasives" like wild pigs can be sold commercially but must be live trapped then butchered in an FDA-approved facility.
The general ban on the commercial sale of wild fish and game is one of the key tenets of the
North American Model of Wildlife Conservation FWIW,
Dave