stop telling him to give it to a goldfish, they are still fish. I though we were in this to humanely care for fish, not just the cool looking, big, or expensive ones.
You will find some crazy stuff (to the American pallet at least) in these places. They sell trichogaster trichopterus at a local asian food market (full grown and the blues ones... like mine...), they also have different kind of eels commonly kept in aquariums.