Bullhead, is the water really clear right now? If so a pair of polarized sun glasses and a walk along the north shore in the afternoon on a calm sunny day could give you and decent idea on what you have for fish. Both LMB and BG like to sun themselves in shallow water this time of year when the water is still this cold. Your water temps should be in the 40's right now.

Have you decided what you want to manage for? Big bass? Big Bluegill? or just a well balanced pond? or possibly something else?