Read this thread.

http://www.pondboss.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=20;t=001972

It turned out to be a really informative piece of information. My water boatmen are the primary food source for the bluegill in my all male pond. Because there is no reproduction, there are no YOY fish to pressure the boatmen and they go wild. I kid you not...I have millions. I'm not exagerating either. If you go anywhere on the pond and drop a five gallon bucket you will get between 100 and 300 boatmen. Sometimes it looks like it is raining on my pond because the boatmen pop up to the surface, presumably to grab a little air so they can remain slightly bouyant (I'm guessing about this) and the bluegill gorge on them. I have kept a few bluegill and counted 175 boatmen, or more, in one fish. Definitely a good protein food source. They're kind of dumb and slow so I think they make easy pickings.

Holding a redear sunfish is like running with scissors.