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Lampetra ayresii is a species of lamprey in the family Petromyzontidae.It is also called the river lamprey or western river lamprey.It is found in the eastern Pacific, specifically from Tee Harbor, Juneau in Alaska to the Sacramento–San Joaquin drainage in California, USA.
The Pacific lamprey (Entosphenus tridentatus) is an anadromous parasitic lamprey from the Pacific Coast of North America and Asia in an area called the Pacific Rim. [4] It is a member of the Petromyzontidae family. The Pacific lamprey is also known as the three-tooth lamprey and tridentate lamprey. Ammocoetes held by biologist in the Carmel River
The Kern brook lamprey (Lampetra hubbsi) is a species of lamprey in the Petromyzontidae family endemic to the United States. [4] It is found on the east side of San Joaquin Valley, in lower Merced, Kaweah, Kings, and San Joaquin rivers in California . [ 1 ]
Larvae of all lampreys are called ammocoetes and when small ABL ammocoetes have a dark band running longitudinally along the body, a dark head region, and the remainder of the body is clear. As they increase in size the body becomes increasing darker, reaching a dark brown by the time the ammocoetes reach their maximum size of about 250 mm (10 in).
As with all lamprey species, the least brook lamprey spends the majority of its life as a worm-like ammocoete. The ammocoete (5 mm–20 cm) is clear with a pigmented head when small (<5 cm), but becomes a dark/golden brown as it matures. Ammocoetes have pigmented eye spots located in the head that can detect light and dark.
Northern brook lamprey are considered non-parasitic lamprey. [5] They have poorly developed teeth and a round, disc-like, subterminal mouth, called an oral-disc, for suction. Northern brook lampreys have a single dorsal fin that continues along their entire length until it connects with the caudal fin. [6] This dorsal fin can be notched as well.
One endangered [6] 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 [6] unlike the western brook lamprey which can only feed in its ...
The brook lamprey (Lampetra planeri), also known as the European brook lamprey and the western brook lamprey is a small European lamprey species that exclusively inhabits freshwater environments. The species is related to, but distinct from, the North American western brook lamprey ( Lampetra richardsoni ).