Regardingv Green lake, I believe there are actually two species of carp in there. The ones that grow big (common carp) and grass carp, which were planted to help reduce the weed problem. I believe they feed pretty much on just the grass and weeds in the lake. I think the grass carp were planted 1-2 years ago. I could be all wet on this, so best to check with WDFW to be sure. (in fact maybe I'll just do that, gotta earn my keep around here.