分類 / Names
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Ceratodontiformes (Australian lungfishes) >
Lepidosirenidae (Aestivating lungfishes)
Etymology: Lepidosiren: Greek, lepis = scale + Greek, seiren = a mythological serpent, 1520 (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
生態学
; 新鮮な水 底生の. Subtropical; 24°C - 28°C (Ref. 2060); 5°N - 35°S
South America: Amazon, Paraguay and lower Paraná River basins.
サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 125 cm TL オス/雌雄の選別がない; (Ref. 36887); 最大記録サイズ: 8 年 (Ref. 274)
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).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
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.
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のレッドリストの状況は (Ref. 130435: Version 2024-1)
Human uses
水産業: 食糧水産
用具
特記事項
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インターネットの情報源
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 1.5352 [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).
栄養段階 (Ref.
69278): 3.1 ±0.46 se; based on food items.
回復力 (Ref.
120179): 非常に低い, １４年以上の倍増期間の最小個体群 (tmax > 22; Fec = 22).
Fishing Vulnerability (Ref.
59153): High to very high vulnerability (75 of 100).
