I made a floating livewell out of a nylon mesh decoy bag a pool noodel, and some weighted plastic tubing for the bottom. I anchored it in place and would drop fish in as needed. You can't be too far from the livewell, but the fish can be released unharmed if you want to. It acts like a drift anchor in the water, so don't expect to paddle it around with you. I stored it on top of the rear deck & deployed it when I got where I was going. I transported the fish in triple layered ice bags, so they don't slime me or my boat on the way to the ramp.
Jim