does anyone know of a humane way to put down a fish? I've heard freezing them in a ziplock bag, but I'd like some better ideas than flushing him down the toilet. I have a male betta who is over four years old and his swim bladder just blew up to the size of a small marble this week, so I think it's about his time. I know it's only a betta, but he's been with me for about four years, and sending him to suffocate down the sewer pipes just seems ignominious.

thanks in advance.