This question keeps coming up time and again thru the years in the Ohio forum. Answer, you can use any legally caught fish for bait here in Ohio, bass , walleye, any game fish can be use for bait as long as you caught in legally. In the rivers it dont matter about size either, but you could come onto a problem fishing a lake. Say you caught a 10 inch largmouth for bait in a pond, then tried to use it for bait in a lake with a 16 inch size restretion..If cuaght you could be fined. Just make sure you are using bass of legal size of lakes with size retrictions.