That is an interesting question. Bringing back your own fish? Having someone send a fish? LIvestock importers exporters have to have licensing, and there are restrictions on what can be imported into the US. I found this out when i tried to
DIY from Canada. There are forms, filings and fees because it is livestock. I found the easiest way was to go through a loacl
LFS who kenw the process and let them deal with it. It was a KOI i wanted from a private seller. But it was still expensive, but it sure beat the time i was going to have to spend myself.