Greg Grimes has a video on YouTube. They are electrofishing. There is a segment where a snapper is shocked and brought up, caught in the act of eating what appears to be a perfectly healthy catfish, and the catfishes gills are still moving, and showing signs of good life. IMO , the thought of snappers only catching diseased and dieing fish is a myth. My pond is a totally new climate since cleaning out numerous CC, and several snappers, both small and what I call large.
It appears to me, that there are a couple of species of fish, that are no longer afraid to leave the house.
It could also be a sign of a sore, that has been eaten on by smaller fish. This is a common occurence amongst different types of animals.
