Country Species Summary

Petromyzon marinus in Algeria
Sea lamprey

Petromyzon marinus Linnaeus, 1758
Family:	Petromyzontidae (Lampreys) , subfamily: Petromyzontinae	picture (Pemar_u4.jpg) by Svensen, E.
Order:	Petromyzontiformes (lampreys)
Class:	Cephalaspidomorphi (lampreys)
FishBase name:	Sea lamprey
Max. size:	120 cm TL (male/unsexed; Ref. 5723); max. published weight: 2,500 g (Ref. 5504); max. reported age: 9 years
Environment:	demersal; anadromous ; depth range 1 - 2200 m
Climate:	temperate; 5 - 20°C; 72°N - 25°N
Global Importance:	fisheries: minor commercial
Resilience:	Low, minimum population doubling time 4.5 - 14 years (K 0.16; tm=5-12; Fec = 233)
Distribution:	Northeast Atlantic: Norway including Iceland and the Barents Sea, south to northern Africa. Throughout the western Mediterranean but absent from eastern Mediterranean and the Black Sea. Western Atlantic: Labrador, Canada to Gulf of Mexico in Florida, USA. Landlocked in Great Lakes, Finger Lakes, Oneida Lake and Lake Champlain, Canada/USA (Ref. 12269). Vulnerable in Europe. Appendix III of the Bern Convention (protected fauna) (Ref. 40476).
Diagnosis:	Vertebrae: 0-0. Anguilliform body (Ref. 51442). Presence of 7 branchial openings (Ref. 51442). Two separated dorsal fins, the second continuous with the caudal fin (Ref. 51442). Number of myomeres: 67-74 (Ref. 6258). Brown-yellow colored on the dorsal and lateral part of the body, with black marblings (Ref. 35388, Ref. 51442).
Biology:	Amphihaline species making important migrations. Spends its adult life in the sea for about 20 to 30 months. Adults enter freshwater/estuaries for spawning in spring; after spawning they normally die (Ref. 51442). The larvae are reported to spend 6-8 years in the substrate followed by metamorphosis and movement to sea. They remain in the estuarine/marine environment for a juvenile feeding period lasting 23-28 months, during which they grow from ca. 4 to 900 g; at the end of this period, they move into rivers as adults and reproduce (Ref. 58185). Larvae live in rivers where they feed on microorganisms and detritus (Ref. 30578, Ref. 51442). During juvenile feeding phase, they may not only feed on dead or netted fish, but also attach themselves to healthy fish (e.g. wide variety of bony fishes, sharks and marine mammals) by scraping a hole in their skin and sucking out the blood, body fluids and flesh. An anticoagulant substance prevents the blood of the prey from clotting. The landlocked form is very destructive to freshwater fishes and occasionally annoys bathers by clinging to them (Ref. 51442)
Threatened:	, (Ref. 36508)
Dangerous:	harmless
Coordinator:
Main Ref:	Hardisty, M.W.. 1986. (Ref. 12324)
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Algeria country information
Common names:	[ No common name ]	Ref:
Status:	native	Ref: Vladykov, V.D., 1984
Salinity:	freshwater, brackish, marine
Uses:	live export:
Comments:	Known from the Soummam River basin (Ref. 83305).
Country Information:	www.cia.gov/cia/publications/factbook/geos/ag.html
Occurrences:	Occurrences Point map
Main Ref:	,
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Modified: Boden, Gert

Entered: Agustin, Liza Q.

CGNET - US

Page created by: Eli, 20.10.03, last modified by Eli, 26.06.07

	Ref.:		Glossary
		(e.g. 9948)		(e.g. cephalopods)
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