I don't see a reason to ever use fish as a source of food or scent for hogs. From my experience with literally hundreds of hatchling hogs I produced over the last 5 seasons, I have never had to resort to using fish to feed or scent. And when I do scent {tree frog} it only goes on for 2 or 3 feedings and they are on to unscented. In my opinion, fish has no use when it comes to hognose snakes.