Actually ... there ARE Shad in Cedar Creek Lake (unless they ALL died from the frigid Winter we just had) !!! They weren't 'supposed' to be in the lake, but showed up shortly after the lake opened. Jury is still out as to whether or not they were 'planted', or if the KDFWR poisoning didn't kill "all" of them. The whole idea of having just the "original" five species of fish in CCL ... was so that the larger fish of each specie would feed on the fry/young of the others, and keep the balance.
My vote, on whether or not the poisoning killed out all of the shad, is "NO". My reasoning is that there are several other species of Sunfish in the lake, other than the Bluegill & Shellcracker (which were stocked along with the Black Crappie, LMB, & Channel Cats). This would leave room for some of the Shad, already present in the creek, to have survived the poison, as well. Just MHO, though ... for what that's worth !!

... pappy