Pouched lamprey (Geotria australis) fish profile and information / pictures of Pouched lamprey - Geotria australis

Pouched lamprey (Geotria australis) fish profile

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Scientific Name Geotria australis
Classified By Gray, 1851
Common Name Pouched lamprey
Class Lampreys (Cephalaspidomorphi)
Order Lampreys (Petromyzontiformes)
Family Lampreys (Petromyzontidae)
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. 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. Adults are often found below weirs and dams during their spawning migration which may take them 60 km or more upstream of the coast. 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. Sometimes they exit the water by wriggling up the bank to bypass obstacles to migration. Adults stop feeding while in freshwater and die shortly after spawning. Maximum length reported to reach 62 cm TL. Common length is 45-50 cm. Status of abundance decreased due to proliferati
Climate Temperate
Water Temperature From - Celcius Unknown °C
Water Temperature To - Celcius Unknown °C
Depth From - meters Unknown m
Depth To - meters Unknown m
Zone demersal
Distribution Atlantic, Indian and Pacific: coasts of all southern continents, extending into rivers of southern Chile and Argentina.
Region Atlantic, Indian and Pacific
Range 34°S - 55°S
Maximum Length 62.0 cm
Common Length Unknown cm
Environment Marine; freshwater; brackish; demersal; anadromous
Vulnerability High to very high vulnerability (69 of 100)
Resilience Very Low, minimum population doubling time more than 14 years (Preliminary K or Fecundity.)
Threat To Humans Harmless
IUCN Red List Status Not Evaluated
Human Uses Fisheries: of no interest
Phylogenetic Diversity Index PD50 = 1.0000 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)
Trophic Level 4.5 s.e. 0.80 Based on food items.
Is kept in Aquariums False
Occurs in Marine / Salt water True
Occurs in Brackish water True
Occurs in Fresh Water True
Occurs on Reefs False