Western brook lamprey (Lampetra richardsoni) fish species and information / pictures of Western brook lamprey - Lampetra richardsoni

Western brook lamprey (Lampetra richardsoni) fish species information

Scientific Name
Lampetra richardsoni

Common Name
Western brook lamprey

Biology
Distinguished by the very blunt teeth, the lack of a distinct median tooth on the tongue and the lack of posterial teeth. Anterior dorsal fin lower than the posterior, arising well back on body; caudal fin joined to both dorsal and anal fins; anal fin small, represented in males by a low ridge. Females with a pointed 2nd dorsal fin and a conspicuous anal lobe. Back and sides dark gray to brown, ventral side of body whitish ; fins translucent olive-green and the caudal fin with diffuse black pigment.

Classification

Classified By

Vladykov & Follett, 1965

Class

Lampreys (Cephalaspidomorphi)

Order

Lampreys (Petromyzontiformes)

Family

Lampreys (Petromyzontidae)

Distribution

Region

North America

Distribution

North America: Pacific slope from McDonald Lake, southeastern Alaska to Umpqua River drainage in Oregon, USA.

Range

57°N - 43°N

Environment

Climate

Temperate

Water Temperature From

Unknown °C

Water Temperature To

Unknown °C

Depth From - meters

Unknown m

Depth To - meters

Unknown m

Zone

demersal

Environment

Freshwater; demersal; non-migratory

Trophic Level

2.44000005722046 s.e. 0.23 Based on food items.

Occurs in Marine / Salt water

False

Occurs in Brackish water

False

Occurs in Fresh Water

True

Occurs on Reefs

False

Is kept in Aquariums

False

Physical Size and Genetics

Maximum Length

15.0 cm

Common Length

12.5 cm

Phylogenetic Diversity Index

PD50 = 0.5000 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses

Fisheries: of no interest; bait: usually

Vulnerability

Low to moderate vulnerability (34 of 100)

Resilience

Medium, minimum population doubling time 1.4 - 4.4 years (Fec=1,100-3,700 (semelparous))

Threat To Humans

Harmless

IUCN Red List Status

Not Evaluated