I built a floating live box for my catfish. When fishing for several days we tie up this box to the wharf fill it up until we are ready to head home. Then we will take them out to clean them before leaving. Made it out of chicken wire and 1by3 planks. Put a door on the top with a latch. Will keep for a while in this box. Build it as big as you want. Be sure to pull it out of water when putting fish in. They will find the smallest of spaces to make it back to the water. Lost a 30lb. flathead and my brother almost killed me.