Anglers fishing Upper Red Lake will have to keep the carcasses of walleyes and northerns they eat on the lake to prove the fish were legal size, beginning Jan. 12.
The change is in response to a state law passed last year by the Legislature allowing anglers fishing on waters with size restrictions, such as Upper Red Lake and Lake Mille Lacs, to cook a meal of the restricted fish while on the ice.
Previously anglers couldn't do that because they had to leave fish whole so they could be measured.
On Upper Red Lake, walleyes 17 to 26 inches -- the protected slot -- must be released, as do northerns 26 to 40 inches.
The law allowing fish to be eaten on the lake makes enforcement difficult because conservation officers can't determine if the fish being cleaned and consumed are of legal size, said Gary Barnard, Department of Natural Resources area fisheries manager in Bemidji.
"Our officers were looking for some accountability for the fish being eaten on ice to comply with the size regulations," he said. He said there are no indications that anglers are abusing the law, though some fear that is happening.
Many permanent ice fishing houses offer cooking and sleeping facilities.
The law says fish with size restrictions must be whole and measurable when in possession, except when on the ice and a person is in the act of preparing and using the fish for a meal.