When we fish at night early in the season I will just leave them in the livewell and they usually always live until morning. Later in the season I put them in a garbage bag and throw them in the garage refrigerator and then clean them the next day. They always turn out mighty fine!!! Also, I have went to using the electric knife for all my filets now. So fast and clean it's easy to filet a limit in a matter of minutes.
Good fishing to all!
John