S0777950 (stōn′rō′lər)n. Any of several North American minnows of the genus Campostoma, having a ridge on the lower jaw used for scraping algae from rocks.[So called because the males move small stones into a pile to build their breeding nests.]
stone•roll•er
(ˈstoʊnˌroʊ lər)
n. 1. an American minnow, Campostoma anomalum, that moves stones as it feeds. 2. any other minnow or sucker with similar habits, as Hypentelium nigricans.[1795–1805]