I would talk to Fish And Game, they might be interested. I recall reading somewheres that despite their reputation, piranha prefer a vegetarian diet and only eat meat when the water is at it's lowest and they are their hungriest. Maybe there is a dietary deficiency at play?

Although I'd like to point out that deer are extremely stupid. When I lived at home, part of the land is set up as a pistol/light rifle range and the deer would watch me shoot from about a hundred feet away. It might not have realized it was eating a fish, or even that it's legs were wet.

This picture keeps popping into my head. The deer lowers it's head to drink, and a fish grabs it and pulls it in! That's what I want to see on tape.

I read about this in a hunting magazine some years ago. They even had a photo sequence as proof and it wasn´t the april issue. It seems to happen in areas where the deer has lack of calcium. The magazine has pretty good reputation so it might well be true.

That actually makes a lot of sense. A lot of herbivores will gnaw on large bones of the dead after carnivores and scavengers are done to get to the calcium, rodents are murder on skeletons.