Boy, Google fish feeders, and a whole bunch of stuff comes up. A lot of them look identical with different brand names
Couldn't find a particular Auger Feeder that was especially developed for feed training. I'll have to keep looking, but it's been a few years since I saw it.
Bruces Future Fish Feeder:
Actually, that is at the Platte River State Hatchery in MI. I stopped by a couple months ago. Really cool place! These are all automated.