Western brook lamprey

The Western brook lamprey (Lampetra richardsoni) is a small (<18 cm), widely distributed, non-parasitic species of jawless fish endemic to the freshwater coastal waterways of the Western United States and Canada.[3] Its range extends from the North American Pacific coast from Taku River, southern Alaska, Queen Charlotte Islands, to central California, including Vancouver Island, with major inland distributions in the Columbia and Sacramento-San Joaquin watersheds.[4][5]

Western brook lamprey
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Infraphylum:	Agnatha
Class:	Hyperoartia
Order:	Petromyzontiformes
Family:	Petromyzontidae
Genus:	Lampetra
Species:	L. richardsoni
Binomial name
Lampetra richardsoni Vladykov and Follett, 1965
Synonyms[1][2]
Lampetra richardsoni var. marifuga Beamish & Withler 1986

One endangered[5] parasitic variety, the Morrison Creek Lamprey (Lampetra richardsoni var. marifuga), is unique to Morrison Creek, Vancouver Island, British Columbia. Which is larger in size (15 – 18 cm). The Morrison Creek Lamprey is able to feed after it becomes an adult[5] unlike the Western Brook Lamprey which can only feed in its larvae stage.[5][6]

The Western Brook Lamprey is Not at Risk (Yellow List) and does not have a Species at Risk Act.[6]

It spawns in spring until mid-summer when the water temperature is over 10 degrees Celsius. Nests made out of gravel, after hatching swept donwnstream into quieter parts of the stream and burrow into the ground. Stay in these quiet areas for about four years until eventually turning into adults. When they become adults in late summer to late fall they do not eat. After the lamprey spawns it dies.[6]