Jonny 5 - I thought for awhile that I had a whitefish, but I don't think the scales were big enough to be a whitefish, and the lack of adipose fin ruled it out. I'm a bit disappointed, but I understand that whitefish would have been better eating.

Lowtech - Thanks for the tip. For some strange reason, I thought that what I had was trout. In any case, good thing I learned the lesson with a fish that isn't an endangered species. I'm fishing with barbless hooks so anything I can't ID from now on can be safely and quickly returned to the water.
Rieber - I'll keep it in mind. I don't know if I want more pikeminnows though.

It was fun to catch, though, and put up one hell of a fight for its size.