Geotria australis Gray, 1851

Pouched lamprey

Catalog of Fishes (gen., sp.) | ITIS | CoL

Classification	Cephalaspidomorphi \| Petromyzontiformes \| Petromyzontidae \| Geotriinae
Synonyms	Ammocoetes landbecki, Dionisia patagonica, Geotria allporti, ... more
Common names	Pouch lamprey, Lamprey, Lamprea, ... more

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Image of Geotria australis (Pouched lamprey)

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Main reference

Fernholm, B. 1990. (Ref. 5154)
Other references | Biblio | Coordinator | Collaborators

Size / Weight / Age

Max length : 62.0 cm TL male/unsexed; (Ref. 39873)

Environment

Demersal; anadromous (Ref. 51243); freshwater; brackish; marine

Climate / Range

Temperate; 34°S - 55°S

Atlantic, Indian and Pacific: coasts of all southern continents, extending into rivers of southern Chile and Argentina.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

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).


IUCN Red List Status (Ref. 57073)	Threat to humans
Not Evaluated	Harmless

Human uses
Fisheries: of no interest


More information
Countries FAO areas Ecosystems Occurrences Introductions Ecology Diet Food items Food consumption Ration	Common names Synonyms Metabolism Predators Ecotoxicology Reproduction Maturity Spawning Eggs Egg development	Age/Size Growth Length-weight Length-length Length-frequencies Morphometrics Morphology Larvae Larval dynamics Recruitment Abundance	Other references Biblio Aquaculture Aquaculture profile Strains Genetics Allele frequencies Heritability Diseases Processing	Collaborators Pictures Stamps Sounds Ciguatera Speed Swim. type Gill area Otoliths Brains Vision

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Internet sources

Estimation of some characteristics with mathematical models

Phylogenetic diversity index (Ref. 82805)

PD₅₀ = 1.0000

Resilience (Ref. 69278)

Very Low, minimum population doubling time more than 14 years (Preliminary K or Fecundity.)


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
High to very high vulnerability (69 of 100)	Not marketed/unknown

Entered by Jarre-Teichmann, Astrid

Modified by Ortañez, Auda Kareen

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