I've noticed the same thing the last couple years, and have suspected holdovers from very late fall spawn. I've wondered if bg this size have an impact on YP yoy, as I haven't seen any YP of a size that I'd have expected from a successful spawn last year, which was the first year the YP had reached spawning size. YP are very early spawners, and there's not much to eat in the pond right now...I hope those little BG aren't putting the hurt on the new perch.