Lepidosiren paradoxa, South American lungfish : fisheries

Lepidosiren paradoxa Fitzinger, 1837

South American lungfish
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Lepidosiren paradoxa
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> Ceratodontiformes (Australian lungfishes) > Lepidosirenidae (Aestivating lungfishes)
Etymology: Lepidosiren: Greek, lepis = scale + Greek, seiren = a mythological serpent, 1520 (Ref. 45335).

Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet Ökologie

; süßwasser demersal. Subtropical; 24°C - 28°C (Ref. 2060); 5°N - 35°S

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South America: Amazon, Paraguay and lower Paraná River basins.

Größe / Gewicht / Alter

Geschlechtsreife: Lm ?  range ? - ? cm
Max length : 125 cm TL Männchen/unbestimmt; (Ref. 36887); max. veröff. Alter: 8 Jahre (Ref. 274)

Biologie     Fachlexikon (Englisch) (z.B. epibenthic)

Obligate air-breathing (Ref. 126274); Prefers stagnant waters where there is little current. Juveniles feed on larval insects and snails. Adults are omnivorous and feed on aquatic vertebrates, invertebrates such as snails, clams and shrimp, and algae (Ref. 36739). Can survive low oxygen levels in its habitat by means of its very reduced branchial apparatus. It possesses two lungs without bronchial tubes. During the dry period, this species burrows into the mud, to a depth of about 30-50 cm, and seals off the entrance with clay, leaving out 2-3 holes for aeration. It reduces its metabolism during this period of hibernation. The fish are obligate air-breathers and will drown if denied access to the surface (Ref. 36739). During the rainy season, reproduction begins. The parents gather vegetal debris in a burrow (about 1.5 m long) to create a nest. During reproduction, males guard the young. These males can increase the oxygen level in the burrow because during breading season the pelvic fins develop highly vascularized, gill-like, feathery structures which perform a function opposite to those of gills: they releases oxygen from the blood and take in carbon dioxide; the filaments disappear after the end of the breeding season (Ref. 12225, 36739). The young look like amphibian tadpoles with four external gills. During the first weeks of their life they breath only through the external gills; at an age of 7 weeks they become air-breathing and regression of the external gills begins (Ref. 27188, 36739).

Lebenszyklus und Paarungsverhalten Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fruchtbarkeit | Larven

Spawning occurs during the wet season. Adult males guard and aerate the hachlings and young temporarily. Adult males develop vascular filaments on their paired fins which function either as auxillary to respiration so that they can breathe air without leaving the nest or the fin filaments permit the emission of aerially obtained oxygen in to the nest water, causing the oxygenation of the water surrounding the eggs (Ref. 111170). The function of the filaments is much debatable as of the present.

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Arratia, G., 2003. Lepidosirenidae (aestivating lungfishes). p. 671-672. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. (Ref. 36887)

IUCN Rote Liste Status (Ref. 130435: Version 2025-2 (Global))

  nicht bedroht (LC) ; Date assessed: 21 October 2020

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Bedrohung für Menschen

  Harmless





Nutzung durch Menschen

Fischereien: kleinfischerei
FAO - Publication: search | FishSource |

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Schätzungen auf der Grundlage von Modellen

Phylogenetischer Diversitätsindex
(Ref. 82804) 		PD50 = 1.5312 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
Trophische Ebene
(Ref. 69278) 		3.1   ±0.46 se; based on food items.
Widerstandsfähigkeit
(Ref. 120179) 		sehr niedrig, Verdopplung der Population dauert mehr als 14 Jahre. (tmax > 22; Fec = 22).
Anfälligkeit der Fischerei
(Ref. 59153) 		High vulnerability (58 of 100). 🛈
Preiskategorie
(Ref. 80766) 		Unknown.