Bill, Sylvan Lake in the SD Black Hills has FHM, GSH, and is stocked annually with hatchery rainbow trout. I fished this lake in 2007 and there were FHM everywhere along the shoreline, surprisingly there was very little cover for the FHM to hide in.
https://denr.sd.gov/dfta/wp/tmdl/tmdl_sylvan.pdfThe South Dakota Department of Game, Fish, and Parks (SDGF&P) last conducted a fishery survey in June of 1995. This survey consisted of using 4 � inch mesh frame net sets, 2 quarter arc seine hauls with a 100 ft. x 6 ft. x � inch mesh seine, and a baby frame net set with � inch mesh.
Golden shiners, fathead minnows, and rainbow trout were collected during this survey. Healthy populations of golden shiners and fathead minnows were sampled. A total of 106 fathead minnows and 130 golden shiners were collected.
Although Sylvan Lake is managed as a put and take rainbow trout fishery, only nine hatchery rainbow trout were captured by all sampling methods. Annual scheduled stocking of catchable rainbow trout and occasional supplemental stocking of adult rainbow trout maintains a viable trout fishery. On average, approximately 13,000
rainbow trout (catchable size) are stocked annually.
