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Geotria australis in Falkland Is. (Malvinas)
Pouched lamprey

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Geotria australis   Gray, 1851
Family:	Petromyzontidae (Lampreys) , subfamily: Geotriinae			picture (Geaus_u1.jpg) by McDowall, R.M.
Order:	Petromyzontiformes  (lampreys)
Class:	Cephalaspidomorphi (lampreys)
FishBase name:	Pouched lamprey
Max. size:	62.0 cm TL (male/unsexed; Ref. 39873)
Environment:	demersal; anadromous
Climate:	temperate; 34°S - 55°S
Global Importance:	fisheries: of no interest
Resilience:	Very low, minimum population doubling time more than 14 years (Preliminary K or Fecundity.)
Distribution:	Atlantic, Indian and Pacific: coasts of all southern continents, extending into rivers of southern Chile and Argentina.
Biology:	Occurs in mud burrows in upper reaches of coastal streams for the first four years of life until metamorphosis and subsequent downstream migration to the sea (Ref. 44894). Adults inhabit the sea for an undetermined period and are parasitic on other fishes. Migrate upstream which may last for 16 months and spawn in freshwater (Ref. 5154). Adults are often found below weirs and dams during their spawning migration which may take them 60 km or more upstream of the coast (Ref. 44894). Migration mostly takes place in rainy nights when water levels are rising, with temperatures between 12-14.5°C and when there is extensive cloud cover or during the dark phase of the moon (Ref. 5154). Sometimes they exit the water by wriggling up the bank to bypass obstacles to migration (Ref. 44894). Adults stop feeding while in freshwater and die shortly after spawning. Maximum length reported to reach 62 cm TL (Ref. 5154). Common length is 45-50 cm. Status of abundance decreased due to proliferation of obstacles such as dams and weirs to upstream spawning runs (Ref. 44894)
Threatened:	Not Evaluated, see IUCN Red List  , (Ref. 36508)
Dangerous:	harmless
Coordinator:
Main Ref:	Fernholm, B.. 1990. (Ref. 5154)
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Falkland Is. (Malvinas) country information
Common names:	[ No common name ]		Ref:
Status:	native		Ref:
Salinity:	freshwater, brackish, marine
Regulations:	no regulations		Ref:
Uses:	no uses
Comments:	Also Ref. 75154.
Country Information:	www.cia.gov/cia/publications/factbook/geos/fa.html
Occurrences:	Occurrences    Point map
Main Ref:	Pequeño, G., 1989
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More information:	Countries FAO areas Occurrences Introductions Ecosystem Ecology Diet Food items Food consumption Ration Predators Ciguatera Fish loss Common names Synonyms Pictures Sounds Reproduction Maturity Spawning Eggs Egg dev. Larvae Larval dynamics References Growth L-W relationship L-L relationship Length frequencies Recruitment Max. age & size Metabolism Morphology Morphometrics Gill area Brains Vision Collaborators Genetics Allele frequencies Heritability Strains Aquaculture Aquaculture profile Diseases Ecotoxicology Processing Speed Swim. type Stamps
	Note: No data are available if label is black .
Tools:	Biogeographic modelling | E-book | Field guide | Identification keys | Length-frequency Wizard | Life-history tool | Point map |
Internet sources:	BiOSC Point Data | CISTI | Google | GOBASE | GenBank ( genome, nucleotide ) | PubMed | Scirus | Tree of Life |   Neodat | Zoological Record
	Note: use the Back button of your browser to return to FishBase.
	Modified:  Ortañez, Auda Kareen	Entered:  Garilao, Cristina V.

	Ref.:				Glossary
		(e.g. 9948)				(e.g. cephalopods)
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Page created by: Eli, 20.10.03, last modified by Eli, 26.06.07