I either shoot them in the head and throw them back or take a boat paddle to them. I had one steal a squirrel I dropped from a tree. He hit the water three feet off the bank of a small bayou in my backyard. I saw the wake go towards the squirrel. Before I could drag it in with a limb, I saw the grennel nose up to it, grab it, and took off like a flash. Craziest thing I'd seen squirrel hunting. Watched one shred a hole in my neighbor's bream basket he had hanging off his pier. It was grabbing it and shaking the snot out of it. Once it tore a hole, in went the head and out it came with a bream. Those things are eating machines. Fun to catch on a pole, but I won't let one go back in the water alive.
A bad day fishing is better than a good day at work, unless you fish for a living.