My friend and I were told by the Findlay office, when we inquired about fishing over night and limits regarding ice fishing over night. We were instructed to use key tags, those circle rings with a metal wire ring. On them place your name, date, and tag each fish. Do not put you and your buddies fish together, and do not fillet, gut and de-gill . Keep these fish totally separated from the prior days fish. Pictures of the fish with the tags and a date attached to the photo is another advised bit of proof.
It is all about the proof if you leave any doubt , they will
no pun intended... Doubt You.