Eat anything they see, hear, sense and can catch that they can cram down their throat. I am worried about the future of the green sunfish though. they could very well be the OGMSF and breeding with anything that will take their seed making many, many hybrid sunfishes. Is mother nature messing with the genetic pure greenies? I would not want a bunch of Mutt greenies. Come to think about it I have caught some that just don't act right. 🤪