There are walleye in the river just in small numbers. They look like a sauger except in the river they are greener, don't have the dark blotches that many of the sauger have, and they have a yellow tip on the bottom ray of their tail. If you look them up in a fisheries book they also have a different number of rays in their dorsal fin and such.
Now to really blow your mind there are also "saugeyes" where sauger and walleye have cross-bred. I can't tell you how to spot a saugeye but I have heard from the fisheries people that it does happen. Years ago a friend of mine caught what we thought was a walleye while striper fishing below the dam that went around 6 pounds. But it looked more like a sauger and thats when I learned about saugeye and it was probably one of them (we released it so it wasn't confirmed)...
kc
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