I have gizzard shad in my pond and at one time had threadfin shad as well. I have stocked a lot of hsb in my pond and normally have fish feeders running but in an effort to thin out the shad and to clear the water I haven't fed the fish since October. The hsb seem to keep the gizzard shad in check and I love to watch them attack the gizzard shad like a pack of wolves. I think it is working because I dont see any schools of shad right now and the water has become crystal clear. The water may have become too clear and so I will start the feeders going again next week. I just thought I would add this information as a way to control shad if you get too many of them. AS you can see hsb and lmb both like to eat shad