Fish
Redeye Bass
Micropterus coosae · also called redeye basses, Coosa bass
In a clear, rocky upland stream tumbling down from the southern Appalachians, a redeye bass holds against the current, its strikingly red iris giving away its identity among the smaller stream-dwelling relatives of the more familiar largemouth and smallmouth bass.
Overview
The redeye bass, Micropterus coosae, is a small black bass native to clear, rocky upland streams across a range spanning parts of Georgia, Alabama, and adjacent southern Appalachian states. Its distinctive red iris, close dependence on clear stream habitat, and vulnerability to hybridisation with introduced bass species make it one of the more habitat-specific and conservation-relevant members of the black bass group.
A bass built for streams, not lakes
While its larger relatives thrive in big rivers and reservoirs, the redeye bass has carved out a narrower niche in clear, rocky upland streams, a habitat specificity that shapes both its smaller size and its more limited overall range.
Status
Least Concern overall, though some populations have been affected by hybridisation with introduced bass species and habitat degradation.
Redeye Bass: common questions
Why is it called the redeye bass?
This species displays a notably red iris, a distinctive feature that gives the species its common name and helps distinguish it visually from other black bass species that share similar clear, rocky stream habitat within the southern Appalachian region.
How is the redeye bass different from the largemouth or smallmouth bass?
This species is smaller on average than the largemouth and smallmouth bass and depends much more closely on clear, rocky, well-oxygenated upland streams, generally avoiding the larger rivers and reservoirs its bigger relatives tolerate well, a stream-specific lifestyle that keeps the redeye bass confined to a narrower type of habitat.
Why is hybridisation a concern for the redeye bass?
This species can hybridise with introduced smallmouth and spotted bass where these species have been stocked into its native streams, and this genetic mixing threatens to erode the distinctiveness of some redeye bass populations over time, a concern shared with several other native black bass species facing similar introduced competition.
Where does the redeye bass live?
This species is native to clear, rocky upland streams across a range spanning parts of Georgia, Alabama, and adjacent southern Appalachian states, staying closely tied to the specific stream conditions it depends on rather than ranging into larger, more turbid water bodies.