Pacific lamprey (Lampetra tridentata) fish species and information / pictures of Pacific lamprey - Lampetra tridentata

Pacific lamprey (Lampetra tridentata) fish species information

Scientific Name
Lampetra tridentata

Common Name
Pacific lamprey

Biology
Characterized by the presence of 3 large sharp teeth on the supraoral bar and three sharp points on each of the central lateral tooth plates. Dorsal fins arise far back on the body, the anterior fin lower and shorter, higher in males; lower lobe of caudal fin larger than upper, the lobes joined to dorsal and anal fins; anal fin rudimentary, virtually absent in males. Adults from the sea blue-black to greenish above, silvery to white below; spawning adults become reddish brown.

Classification

Classified By

Richardson, 1836

Class

Lampreys (Cephalaspidomorphi)

Order

Lampreys (Petromyzontiformes)

Family

Lampreys (Petromyzontidae)

Distribution

Region

North Pacific

Distribution

North Pacific: Bering Sea coasts of Asia and Alaska southward to the Yuhutu River, Hokkaido, northern Japan and Punta Canoas, central Baja California, Mexico. The populations were, at one time, split into two groups as Entosphenus tridentatus tridentatus which ranged from the Columbia River to Alaska, and Entosphenus tridentatus ciliatus which ranged from Klamath River southwards. This division no longer holds. Freshwater resident populations exist in Culrus Lake and the Columbia River, British Columbia, the Sprague River in Oregon, the Goose Lake in Oregon/California, and the Klamath and Shasta rivers and Copco Lake in California.

Range

65°N - 32°N

Environment

Climate

Temperate

Water Temperature From

Unknown °C

Water Temperature To

Unknown °C

Depth From - meters

0 m

Depth To - meters

1100 m

Zone

demersal

Environment

Marine; freshwater; brackish; demersal; anadromous ; depth range 0 - 1100 m

Trophic Level

4.5 s.e. 0.80 Based on food items.

Occurs in Marine / Salt water

True

Occurs in Brackish water

True

Occurs in Fresh Water

True

Occurs on Reefs

False

Is kept in Aquariums

False

Physical Size and Genetics

Maximum Length

76.0 cm

Common Length

41.0 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: subsistence fisheries

Vulnerability

High to very high vulnerability (69 of 100)

Resilience

Low, minimum population doubling time 4.5 - 14 years (tm 6-8; Fec=10,000-106,000 (semelparous))

Threat To Humans

Harmless

IUCN Red List Status

Not Evaluated