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Geotria australis  Gray, 1851

Pouched lamprey
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Geotria australis
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Classification / Names Tên thường gặp | Các synonym ( Các tên trùng) | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Hình lá (hình dải của ấu trùng cá chình) (lampreys) > Petromyzontiformes (Lampreys) > Geotriidae (Southern lampreys)
Etymology: Geotria: Greek, gea = the earth, dealing with earth (Ref. 45335).   More on author: Gray.

Issue
Neira et al. (1988) showed that ammocoetes of an Argentinian population were morphologically distinct from ammocoetes of both Chilean and Australasian (mainland Australia, Tasmania, and New Zealand) populations of the species. Additionally, they stated that adults from Argentina and from South Georgia Island had the cloaca positioned well posterior to the origin of the second dorsal fin rather than aligned immediately under its origin as in Chilean and Australasian populations. Perhaps, therefore, the Argentinian and South Georgian Island population represents a distinct species and this question merits closer scrutiny.

Môi trường / Khí hậu / Phạm vi Sinh thái học

; Biển; Nước ngọt; Thuộc về nước lợ gần đáy; di cư biển sông (để đẻ trứng) (Ref. 89241).   Temperate, preferred ?; 34°S - 55°S, 114°E - 31°W (Ref. 89241)

Sự phân bố Các nước | Các khu vực của FAO | Các hệ sinh thái | Những lần xuất hiện | Point map | Những chỉ dẫn | Faunafri

South America, South Australia, South New Zealand. Southwestern Atlantic, southwestern and soustheastern Pacific.
Coasts of South America: Chile, southern Argentina.
Chile: Andalién, Biobío, Carampangue, Malleco, Picoiquén, Huequén, Purén, Claro, Mehuín, Calle-Calle, Valdivia, Toma Galeones, Santo Domingo, Maullín, Curilelfu, and Donguil rivers, and Lake Risopatron;
Argentina: Limay River;
Falkland and South Georgia islands.

Bộ gần gũi / Khối lượng (Trọng lượng) / Age

Maturity: Lm ?  range ? - ? cm
Max length : 57.0 cm TL con đực/không giới tính; (Ref. 89241); common length : 47.5 cm SL con đực/không giới tính; (Ref. 44894)

Short description Hình thái học | Sinh trắc học

Adult: 7.6-57.0 cm TL; body proportions, as percentage of TL (based on 17 specimens measuring 9.0-57.0 cm TL): 8.3-20.2 prebranchial length, 7.9-11.8 branchial length, 47.6-61.5 trunk length, and 16.1-31.1 tail length; urogenital papilla not prominent in mature adults; trunk myomeres, 70-78; dentition: supraoral lamina with 4 unicuspid teeth (2 pointed central ones flanked by broad lateral flanges), infraoral lamina with 9-15 unicuspid teeth, 8-9 unicuspid endolaterals on each side, 5-7 rows of anterials, first row of anterials with 1-4 unicuspid teeth, 6-8 rows of exolaterals on each side, 1 row of posterials in feeding phase adults with 12 radial plates possibly flanked on each side by 2 unicuspid teeth and in spawning adults about 3 rows (the first consisting of 9 unicuspid teeth), transverse lingual lamina with 3 unicuspid teeth (the median one enlarged in recently metamorphosed individuals), 3 unicuspid teeth (the lateral ones greatly enlarged in feeding individuals and 2 unicuspid teeth in mature individuals), longitudinal lingual laminae each with 4 unicuspid teeth; velar tentacles, 23-40; body coloration (live) in prespawning adults: dorsal surface dark with a pair of longitudinal blue-green stripes running along the dorso-lateral aspect and ventral surface silvery; spawning adults dark blue on dorsal surface and light blue on ventral surface; lateral line neuromasts darkly pigmented; caudal fin shape, rounded; oral fimbriae, 55-65; oral papillae, 16-19 (Ref. 89241).

Sinh học     Tự điển (thí dụ epibenthic)

Found 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). Stones with a volume of 144 ml, equivalent in size to a tennis ball, can be transported by adults using their oral disc (Ref. 89241). 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 SL. Status of abundance decreased due to proliferation of obstacles such as dams and weirs to upstream spawning runs (Ref. 44894). Fecundity, 48,004 to 68,212 eggs/female (Ref. 89241). In New Zealand, the Maori use the pouched lamprey at the beginning of their upstream migration for human consumption and ceremonial purposes (McDowall, 1990). These are caught using weirs built along river edges or collected by hand as they are making their way up the rocky face of falls. They are then dried for human consumption (Ref. 89241).

Life cycle and mating behavior Chín muồi sinh dục | Sự tái sinh sản | Đẻ trứng | Các trứng | Sự sinh sản | Ấu trùng

Main reference Upload your references | Các tài liệu tham khảo | Người điều phối | Người cộng tác

Renaud, C.B., 2011. Lampreys of the world. An annotated and illustrated catalogue of lamprey species known to date. FAO Species Catalogue for Fishery Purposes. No. 5. Rome, FAO. 109 pp. (Ref. 89241)

IUCN Red List Status (Ref. 115185)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




Human uses

Các nghề cá: Các nghề cá là sinh kế
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Sự sinh trưởng
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