JIMMIE PIGG AND ROBERT GIBBS, State Environmental Laboratory, Oklahoma Department of Environmental Quality, Oklahoma City, Oklahoma 73117, USA

A 20-year (1976-1995) survey of fishes in the North Canadian River (known as Beaver in the Oklahoma Panhandle), Lake Eufaula, and the Canadian River below Lake Eufaula produced 23 species of cyprinids. A review of 261 past and recent fish collections (1921 - 1995) by others revealed an additional eight species from the drainage. The distribution of relative abundance of these 31 cyprinid species over time is contrasted to changes in land use and habitat requirements of each species.