Beats me!
Here is a link with a picture and discription for White Perch:
http://www.seagrant.wisc.edu/greatla...hiteperch.html
And here is a link with a picture and a discription of White Bass:
http://www.dnr.state.oh.us/wildlife/...d/whtebass.htm
Follow this link for instructions on how to tell the difference:
http://www.seagrant.wisc.edu/greatla...ssorperch.html