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| Scientific Name |
Lampetra tridentata |
| Classified By |
Richardson, 1836 |
| Common Name |
Pacific lamprey |
| Class |
Lampreys (Cephalaspidomorphi) |
| Order |
Lampreys (Petromyzontiformes) |
| Family |
Lampreys (Petromyzontidae) |
| 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. |
| Climate |
Temperate |
| Water Temperature From - Celcius |
Unknown °C |
| Water Temperature To - Celcius |
Unknown °C |
| Depth From - meters |
0
m |
| Depth To - meters |
1100
m |
| Zone |
demersal |
| 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. |
| Region |
North Pacific |
| Range |
65°N - 32°N |
| Maximum Length |
76.0
cm |
| Common Length |
41.0
cm |
| Environment |
Marine; freshwater; brackish; demersal; anadromous ; depth range 0 - 1100 m |
| 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 |
| Human Uses |
Fisheries: subsistence fisheries |
| Phylogenetic Diversity Index |
PD50 = 0.5000 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes) |
| Trophic Level |
4.5 s.e. 0.80 Based on food items. |
| Is kept in Aquariums |
False |
| Occurs in Marine / Salt water |
True |
| Occurs in Brackish water |
True |
| Occurs in Fresh Water |
True |
| Occurs on Reefs |
False |