Moxostoma carinatum is a river redhorse...there are lots of sub species ......
think these are silver and one shortheaded.
http://dnr.wi.gov/topic/EndangeredRe...ode=AFCJC10040
all redhorse in this have convex dorsal fine and are silvers.
http://www.seagrant.wisc.edu/home/De...605&FishID=133