Spotted Bass

The Spotted Bass is a species of black bass in the sunfish family (Centrarchidae), native to the Mississippi River basin, Gulf Coast drainages, and parts of the Ohio River system. It occupies an ecological niche intermediate between the Largemouth and Smallmouth Bass, often found in clear, flowing rivers and rocky reservoir habitat where both relatives may also occur. Spotted Bass are also known as Kentucky Bass in parts of their range and are a popular sportfish, though they have become an invasive concern in some western reservoirs where they outcompete native trout and other black bass. Several recognized subspecies occur across the range, including the Alabama Spotted Bass.

Spotted Bass have a slender, moderately compressed body, olive-green to bronze above with a row of dark, diamond-shaped blotches along the lateral line and rows of small, distinct spots below it, giving the species its name. The dorsal fin has a shallow notch, less pronounced than in Largemouth Bass.

• Upper jaw typically does not extend past the rear of the eye (unlike Largemouth Bass)
• Small patch of teeth on the tongue, absent in Largemouth Bass
• Red eye coloration common in adults

Distinguished from Largemouth Bass by the shorter jaw and spotted belly pattern, and from Smallmouth Bass by more numerous, distinct spot rows and generally greener coloration.

Spotted Bass favor clear, flowing rivers, streams with moderate current, and rocky or gravelly reservoir habitat, often occupying deeper, cooler water than Largemouth Bass while tolerating warmer conditions than Smallmouth Bass. Native range centers on the Mississippi River basin, Ohio River drainage, and Gulf Coast river systems from Texas to Florida. They favor areas with rock, gravel, or woody structure and are frequently found near current breaks in rivers or along rocky points and ledges in reservoirs. Introductions outside their native range, particularly into western reservoirs and rivers, have allowed Spotted Bass to establish self-sustaining and sometimes invasive populations.

Spotted Bass are opportunistic predators feeding on crayfish, small fish, and aquatic insects, often foraging along rocky bottom structure and current seams. They tend to school more than other black bass species, particularly in open reservoir water, and are active feeders across a wide temperature range. Spawning occurs in late spring as water warms into the high teens Celsius, when males construct and guard nests over gravel or rocky substrate in relatively shallow water, defending eggs and fry until they disperse. In non-native reservoirs, Spotted Bass can hybridize with and competitively displace Smallmouth Bass and native trout, making them a management concern in parts of the western United States.