Recreation and Park District
The smallmouth bass is generally brown with red eyes and dark brown vertical bands, rather than a horizontal band along the side. There are 13–15 soft rays in the dorsal fin. The upper jaw of smallmouth bass extends to the middle of the eye.
Males are generally smaller than females. The males tend to range around two pounds while females. can range from three to six pounds.
Their average size can differ, depending on where they are found. Their habitat plays a significant role in their color, weight, and shape. River water smallmouth that live among dark water tend to be rather torpedo shaped and very dark brown in order to be more efficient for feeding. Lake smallmouth bass that live, for example, in sandy areas, tend to be a light yellow-brown to adapt to the environment in a defensive state, and are more oval shaped.