We have the same problem, though I think it is the many adult perch, the remaining few BCP, and the few WE beating up the YOY.

I started with a lot of YP minnows this spring, but if any made it to fall, I could not see them in the traps or in the schools I normally do.

A good fish fry may be what is needed to restore balance, though I am waiting for the BCP to get hammered to smithereens first. After that I am sticking with perch and walleye.