I agree with Ewest on ID.
Hooksetter, you will notice that some of us have different opinions on the Green Sunfish. I like them. State records indicate that they seldom get as big as a BG. However, it is my opinion that, for their size, they outfight them. They are also more cylindrical shaped so are easier for a predator to digest. Since they only spawn anually, they rarely "take over" a pond. I would personally put that little guy back in the water as bass food.
BTW, it would be helpful if you would indicate your location. It really matters.
Also, most of us here, although raised to call all of them perch, think of a perch as a Yankeefied fish named a yellow perch. Yeah I know, but it makes communication here a lot easier for us when someone says BG, CNBG, RES, GSF, etc.