This is a fair rule. There were guys in minnesota that had almost 1 thousand perch in thier possesion after a week of ice fishing, that was almost four times the possesion limit, they were lucky to only get fined, and not need to walk back home. Same thing happened in Indiana with coho salmon, guy went fishing every day, limited out, and was having them smoked.Alot of those freezer fish, wind up in the garbage can later. In some places you need to leave a skin tab on every fillet, and when they check you, better be legal. Usuallu these things come up because someone has called the DNR and made a complaint.