I personally would raise a handful to see what they look like.
That being said I can see both sides of the fence.
IMO, the offspring would not be a hybrid. The parents are the same species, that originate from different waters. Their food, habits, and environment have given them subtle differences in appearance through years of evolving and surviving. They are still, though, the same species.
On the other hand, both of these fish are pure of blood, and have certain subtle characteristics that make them stand out from other fish in their species. I can see why one would not want to mix genes with another fish of different origins and slightly different prominent characteristics.