New(ish) laws on keeping exotic animals

I have heard from various dealers of exotic animals of the smaller kind that certain things are no longer allowed due to fear of naturalizing. which makes sense seeing as some fish, mammals, lizards, birds and bugs have made a comfy home here. But im looking for government sources and specifics on species and their requirements. For example maybe keeping them ok but breeding isnt. or importing is banned. Maybe can get a permit etc. does anyone knwo where one could find such info?