RES eat whatever they want.
When they want.
How they want.
Got a problem with that?
Dont forget, they are especially fond of wimpy Greenies.
But on a serious note, having or keeping stumps and/or bottom grass should keep the mullosk population up to support RES. A long time hatcheries guy, who happened to pull out a 1.75# bluegill frozen to show me, said that if no stumps or grass that too many res would result in sunken in stomachs and stunting. No bottom vegetation , go lighter then 20%.
