I've got some I've dumped that have never had a fish and also have some that the fish get on almost immediately. I guess it is all about where you drop. I've got a 1/2 dozen pvc buckets that I've only caught fish off of one time, but that one time, it seemed was the only place they were really stacked on. I sure ain't got it figured out. Now, instead of dropping blind. I try to supplement known fish producing areas.