Probably Carp. I have been fishing the Clinch my entire life, and I haven't seen Buffalo, but that doesn't mean their not there. I have seen and caught many of Buffalo on the Holston River. If you catch one you should be able see a big difference in coloration. Most Buffalo I have caught are extremely dark on their entire body and have more of a football shape.
"Give a man a fish and he will eat for a day. Teach him how to fish and he will sit in a boat and drink beer all day." ~Unknown~