Identification and Naming
Recent taxonomic work places this species in Vexillichthys rather than Thoburnia. Thin dark horizontal stripes and a large black mark near the front outer portion of the dorsal fin are characteristic. Pads occur underneath the leading pectoral-fin elements.
Size and Weight
The reported maximum total length is 17 cm, approximately 6.7 inches, with a common length around 12.3 cm. A measured maximum weight was not established. The typical or maximum weights of other suckers do not provide a reliable substitute.
Habitat and Distribution
Its native distribution is concentrated in headwater tributaries of the Barren River in Kentucky and Tennessee. Field research found rocky outcrops and substantial bedrock ledges to be important habitat features. Streamside vegetation and conditions within the surrounding watershed also help explain differences between sampled sites.
Observation and Conservation
Its limited geographic range makes local habitat conditions especially consequential. This profile does not recommend targeting it as a sport fish, and a verified species-specific bait recommendation was unavailable. Records should be interpreted at the tributary level rather than assuming it occupies every water in the larger basin.
A Small Sucker With Its Own Genus
Anatomical and evolutionary evidence prompted recognition of Vexillichthys in 2024. The pectoral pads, striped pattern and dorsal marking are part of the distinctive combination that separates this fish from its former genus.
All Lakes With Blackfin Sucker
Browse lakes and reservoirs with documented Blackfin Sucker records, listed alphabetically. Records do not establish current abundance or public access. Check the evidence and managing authority for the water you choose.
No published lakes are currently linked to this species in our confirmed records.