In ND you have to clean them I believe at tourneys to be legal. It’s because fish were floating belly up after they were weighed and released. I had a slip at the casino for a few years... Well the casino had a chute to let the fish down into the bay after weighing. One day I see Russ, guy with boats in slips, on his jet ski netting dead pigs. He got in trouble from warden for that. All he did was retrieve dead fish that were released . It wasn’t long after tourneys became kill only. Even smallmouths tourneys are kill which is really something.