Gizzard Shad are filter-feeders. But I'd heard that larger Gizzard Shad will eat nymphs. I found out that rumor is true! I probably could have caught more using a smaller nymph, but I was floating a #8 or #6 under an indicator trying to tempt a carp. Anyway, I caught 4 Shad, and missed other strikes. These shad were probably 10"-12" range. Apparently they can get up to 22"!
Oh...and I DID finally get a carp, and had another bigger one break my line.