Schmidt, K.P. 1993. Stream survey results for the gravel chub (Erimystax x-punctatus) and black redhorse (Moxostoma duquesnei) in Southeastern Minnesota. Final report submitted to the Natural Heritage and Nongame Research Program, Minnesota Department of Natural Resources. 9 pp.
In 1984, the Minnesota Department of Natural Resources (MDNR) officially listed the gravel chub and black redhorse as special concern species. Both these species are on the periphery of their ranges in southeastern Minnesota (Coffin and Pfannmuller 1988). MDNR Fisheries and James Ford Bell Museum of Natural History (Bell) surveys have sampled the gravel chub from the Root River in Fillmore and Houston Counties and the Upper Iowa River in Fillmore County. The black redhorse has been reported from the Zumbro River watershed in Dodge, Goodhue, and Olmsted Counties; and the Root River watershed in Fillmore and Olmsted Counties.
Regionally, the gravel chub was formerly Threatened in Iowa (Harlan and Speaker 1987 and Schmidt 1984) and is Endangered in Wisconsin (Schmidt 1990). The Black Redhorse is Threatened in Iowa and was considered extirpated in Wisconsin (Schmidt 1990), but was recently proposed for Endangered status.
In October 1992, surveys were conducted for both species to establish new records; provide additional information on distribution, relative abundance, habitat use and associate species; and evaluate the selectivity of sampling gears and methods.