The cardinal rule of native fishkeeping is once caught, never released. It may seem kind to do, but locally, at my old place, we had had a couple of really interesting species eliminated by summertime releases. The fish released would usually die by September, but would out compete natives during the crucial summer months. It's been a really serious issue for turtles, where invasives have really outcompeted local species for food, only to die when winter comes. It's probably for the best if the released tropicals at the glass factory run off died.
Even a native kept in a tank and released back where you caught it is a bad idea. The exposure to tropical fish diseases can play out in too many ways for it to be worth the risk.