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Geotria australis
Immagine di McDowall, R.M.
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Immagine di McDowall, R.M.
Classificazione / Nomi Nomi Comuni | Sinonimi | Catalog of Fishes(Genere, Specie) | ITIS | CoL | WoRMS | Cloffa
> Petromyzontiformes (Lampreys) > Geotriidae (Southern lampreys)
Etymology: Geotria: Etymology not explained, although three possibilities, all problematical, have been proposed: (1) from the Greek geotragia, “eating of earth-like substances,” referring to how this lamprey, like other lampreys, uses its suctorial mouth to attach itself to submerged rocks and stones, thus creating the impression that it is feeding on the earth (problem: geotragia does not mean “earthy,” as in rocks and minerals, but “products of the earth,” such as grains and vegetables; (2) geo- (Gr.), earth, and atrium (L.), room, referring to this lamprey’s nest, presumably made of stones and pebbles assembled by one or both parents (problem: nest-building, while known in other river lampreys, was probably not known to Gray in 1851 and has not been documented for this species); (3) a variation of #2, proposed by Meagher (2010), referring to its discovery in underground chambers, in which it survives dry periods (problem: G. australis does not, nor does any other lamprey, aestivate, nor did Gray indicate it was discovered underground, although he did speculate whether the pouch was an adaptation to the “long drought of the Australian rivers”). See EthyFish.org for more details (See ETYFish); australis: Latin for southern, referring to South Australia, type locality (See ETYFish).
More on author: Gray.
Etymology: Geotria: Etymology not explained, although three possibilities, all problematical, have been proposed: (1) from the Greek geotragia, “eating of earth-like substances,” referring to how this lamprey, like other lampreys, uses its suctorial mouth to attach itself to submerged rocks and stones, thus creating the impression that it is feeding on the earth (problem: geotragia does not mean “earthy,” as in rocks and minerals, but “products of the earth,” such as grains and vegetables; (2) geo- (Gr.), earth, and atrium (L.), room, referring to this lamprey’s nest, presumably made of stones and pebbles assembled by one or both parents (problem: nest-building, while known in other river lampreys, was probably not known to Gray in 1851 and has not been documented for this species); (3) a variation of #2, proposed by Meagher (2010), referring to its discovery in underground chambers, in which it survives dry periods (problem: G. australis does not, nor does any other lamprey, aestivate, nor did Gray indicate it was discovered underground, although he did speculate whether the pouch was an adaptation to the “long drought of the Australian rivers”). See EthyFish.org for more details (See ETYFish); australis: Latin for southern, referring to South Australia, type locality (See ETYFish).
More on author: Gray.
Taxonomic Remarks
Neira et al., 1988 (Ref. 115329) 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.
Ambiente: milieu / zona climatica / distribuzione batimetrica / gamma di distribuzione Ecologia
marino; acqua dolce; salmastro demersale; anadromo (Ref. 89241). Temperate; 34°S - 55°S, 114°E - 31°W (Ref. 89241)
Distribuzione Territories | Aree FAO | Ecosistemi | Presenze | Mappa dei ritrovamenti | Introduzioni | Faunafri
South Pacific: South Australia, South New Zealand, Chile. South Atlantic: Argentina, Falkland and South Georgia islands.
Dimensione / Peso / Età
Maturità: Lm ? range ? - ? cm
Max length : 57.0 cm TL maschio/sesso non determinato; (Ref. 89241); common length : 47.5 cm SL maschio/sesso non determinato; (Ref. 44894)
Max length : 57.0 cm TL maschio/sesso non determinato; (Ref. 89241); common length : 47.5 cm SL maschio/sesso non determinato; (Ref. 44894)
Breve descrizione Chiavi di identificazione | Morfologia | Morfometria
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).
Body shape (shape guide): eel-like.
Body shape (shape guide): eel-like.
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).
Ciclo vitale e comportamento di accoppiamento Maturità | Riproduzione | Deposizione | Uova | Fecondità | Larve
Semelparous (Ref. 89241).
Riferimento principale
Caricare le referenze | Bibliografia | Coordinatore | Collaboratori
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)
Stato della Lista Rossa IUCN (Ref. 130435: Version 2025-2 (Global))
Data deficient (DD) ; Date assessed: 23 February 2021
CITES
Not Evaluated
Minaccia per l'uomo
Harmless
Usi umani
Pesca: pesca di sussistenza
FAO - Publication: search | FishSource |
Informazioni ulteriori
Ecologia trofica
Articoli alimentari (prede)
Alimentazione
Consumo di cibo
Razioni alimentari
Predatori
Articoli alimentari (prede)
Alimentazione
Consumo di cibo
Razioni alimentari
Predatori
Dinamica della popolazione
Parametri di crescita
Età massima / dimensioni massime
Rapporto lunghezza-peso.
Lunghezza-lunghezza rel.
Lunghezza-frequenze
Conversione di massa
Reclutamento
Abbondanza
Parametri di crescita
Età massima / dimensioni massime
Rapporto lunghezza-peso.
Lunghezza-lunghezza rel.
Lunghezza-frequenze
Conversione di massa
Reclutamento
Abbondanza
Ciclo di vita
Riproduzione
Maturità
Maturità/Gli occhielli sono relativi.
Fecondità
Deposizione
Aggregazioni riproduttive
Uova
Sviluppo delle uova
Larve
Dinamica popolazioni larvali
Riproduzione
Maturità
Maturità/Gli occhielli sono relativi.
Fecondità
Deposizione
Aggregazioni riproduttive
Uova
Sviluppo delle uova
Larve
Dinamica popolazioni larvali
Fisiologia
Composizione corporea
Nutrienti
Consumo di ossigeno
Tipo di nuoto
Velocità di nuoto
Pigmenti visivi
Suono del pesce
Malattie e parassiti
Tossicità (LC50)
Composizione corporea
Nutrienti
Consumo di ossigeno
Tipo di nuoto
Velocità di nuoto
Pigmenti visivi
Suono del pesce
Malattie e parassiti
Tossicità (LC50)
Legato all'uomo
Sistemi di acquacoltura
Profili di acquacoltura
Varietà
Casi di Ciguatera
Francobolli, monete, materiale vario.
Sistemi di acquacoltura
Profili di acquacoltura
Varietà
Casi di Ciguatera
Francobolli, monete, materiale vario.
Strumenti
Libro elettronico | Giuda pratica | Chiavi di identificazione | Generatore frequenze di lunghezza | Strumento Parametri Biologici | Mappa dei ritrovamenti |
Cattura-MSY |
Rapporti speciali
Controllo della manutenzione dell'acquario | Verificare la presenza di schede informative sulle specie | Verifica delle schede informative sull'acquacoltura
Scarica XML
Fonti Internet
AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: Genere, Specie | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GloBI | Google Books | Google Scholar | Google | IGFA World Record | Database Nazionali | OneZoom | Open Tree of Life | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | TreeBase | Tree of Life | Wikipedia: Go, ricerca | World Records Freshwater Fishing | Zoobank | Record zoologico
Stime basate su modelli
|
Indice di diversità filogenetica (Fonte Biblio. 82804) |
PD50 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
| Bayesian length-weight | a=0.00102 (0.00046 - 0.00225), b=3.06 (2.88 - 3.24), in cm total length, based on all LWR estimates for this body shape (Ref. 93245). |
|
Livello trofico (Fonte Biblio. 69278) |
4.5 ±0.80 se; based on food items. |
|
Resilienza (Fonte Biblio. 120179) |
Basso, tempo minimo di raddoppiamento della popolazione 4.5 - 14 anni (Semelparous species, assuming tm (= tmax) > 4). |
|
Vulnerabilità della pesca (Ref. 59153) |
Moderate vulnerability (44 of 100). 🛈 |
|
Categoria di prezzo (Ref. 80766) |
Unknown. |
|
Nutrienti (Ref. 124155) |
Calcium = 17.7 [4.8, 54.2] mg/100g; Iron = 0.328 [0.134, 1.073] mg/100g; Protein = 3.31 [0.00, 6.99] %; Omega3 = 0.626 [0.289, 1.461] g/100g; Selenium = 14.6 [4.2, 40.9] μg/100g; VitaminA = 20.7 [7.3, 59.9] μg/100g; Zinc = 0.436 [0.218, 0.833] mg/100g (wet weight); |