I've had only one or two problems with importing wild caught fishes into my aquarium. Most of them were only with Congo Tetras because they were always dying. Unfortunately I might have found the solution. They require different water conditions than my South American fishes.
So other than that I haven't had any problems. I raised wild Altum Angels before in my big huge tank a long time ago, along with the Giant Gourami fish. I usually would go for fishes that are young still. The best I've had were freshwater stingrays. Even though they can sting you.. you just have to be careful

I've kept my little stingray for a long time. I'm looking for freshwater jelly fishes

I hear they don't sting xD