MY uncle has a small pond 20' x 10' with (2) 20lb channel cats and a few bass and large bluegill. Every time i go stay with him I go catch (50) (legal limit) sunfish(bluegill and greenies) and i dump them in the pond. Even 30minutes later i can sit by the pond and bluegill will still be jumping out onto the lawn .

If you are worried they wont eat them then 1/2 or 1/4 the bluegill and throw them in the freezer for winter feeding. I thought blues tolerated cold water pretty well.