I wasn't able to find a whole lot of info on the web about river otters in KY except to confirm that yes, KDFWR did re-introduce some, starting in 1991. There's been more written about their impact in Missouri. I think it's safe to say, though, that their feeding habits would be pretty much the same here:

http://www.otternet.com/ROA/Fall2001/missouri.htm

http://mdc.mo.gov/conmag/2005/06/30.htm