Yeah, I think if you have a pond with a healthy RES population, they will keep the clam numbers down.

My plans right now for the 1/3 acre pond are 100 RES of both sexes, 20 male BG, 10 SMB stocked per year, as I doubt there will be any natural reproduction(all mud/clay bottom), and 5 HSB per year along with my special potion of forage fish. My goal is to grow some huge RES and some decent sized BG along with the occasional nice SMB and HSB. So hopefully the only fish naturally reproducing will be the RES and forage fish.