Range and Identity
Entosphenus lethophagus is recorded in the Pit system of northeastern California and parts of the Klamath drainage in south-central Oregon. Occurrence is not uniform across those basins. A drainage-wide description should therefore remain separate from evidence that a particular creek contains the species.
Habitat and Behavior
Adults occur in clear riffles and runs. Larvae have been recorded near weed beds and sand bars, showing why a single life stage does not describe every occupied microhabitat. Stream records are more informative when they include whether the animal was a larva or a transformed adult.
Food and Life History
The upper reference is twenty-two centimeters total length, with fourteen centimeters given as a common size. This brook lamprey does not have a parasitic adult feeding phase and reproduces once. A local observation of mature fish in March does not establish a range-wide breeding date.
Field Note
Record life stage with the observation. A sediment-dwelling larva and a mature lamprey in flowing water can represent different parts of the same freshwater life cycle.
All Lakes With Pit-Klamath Brook Lamprey
Browse lakes and reservoirs with documented Pit-Klamath Brook Lamprey 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.