Black crappies are most accurately identified the black crappie from the white one is by the seven or eight spines on its dorsal fin vrs the six that white ones have. They have rows of dark spots on there dorsal and anal fins, they have a large mouth extending to below the eye. they typically range from about 10 inches long the largest one found was 19.3 inches weighing 5.9 lbs. they are native to minnesota and prefer deep cool lakes.