I suspect you are right regarding hassles for out of State folk trying to bring fish in on a commercial basis or even shipping them in. That is why I think I'd like to talk to the local people myself to see how they feel a fish that already is found here and could hybridize on its own in local waters is not allowed in a pond that has no connection to any other body of water...
The fish you found from 1996 is classified as a White Bass that hybridized with something. Freaks of nature do occur, but that don't mean there is a viable and reproductive population taking over the planet.
You already have contact info., so be my guest at persuading the State to allow you to stock HSB in your MI pond.
Who knows, you may be the first one, legally.
