But captive axolotls are not really true axolotls, they are different from the near extinct wild ones (they have a bit of tiger salamander mixed in). And this really only holds true if people breed their wild-caught aquatic animals - otherwise you are just grabbing a living being from its home and putting it in a tiny cage. There is a place for wild caught fish, but it doesn’t seem very kind to remove them from their habitat to languish in an aquarium for a fraction of their normal lifespan, which is undoubtedly what happens a lot..