Holocephali (helhuvudsfiskar) (chimaeras) >
Chimaeriformes (Chimaeras) >
Chimaeridae (Shortnose chimaeras or ratfishes)
Etymology: Hydrolagus: hydro-, combining form of hydor (Gr.), water; lagos (Gr.), hare, i.e., “water rabbit,” probably referring to three pairs of tooth plates, which tend to protrude from the mouth like a rabbit’s incisors. (See ETYFish); homonycteris: homo-, from hominis (L.), man; nykteris (Gr.), bat, referring to Thomas A. Griffiths, bat systematist known as “bat man,” who introduced Didier to chimaeroid fishes. (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
Ekologi
marina djupbottenlevande; djupintervall 866 - 1447 m (Ref. 76967). Deep-water
Southern Ocean: Australia and New Zealand.
Length at first maturity / Size / Vikt / Age
Maturity: Lm ?, range 85 - ? cm
Max length : 109 cm TL hane/ej könsbestämd; (Ref. 76967)
Short description
Bestämningsnycklar | Morfologi | Morfometri
This chimaeroid fish has a ventral caudal fin that that is not indented at its origin to form a separate anal fin, it is distinguished from its congeners by the following characters: color of the body an even dark black or blackish-brown; its dorsal fin spine is longer than height of first dorsal fin; pelvic fins is distinctly round in shape; males with pelvic claspers that are dark at the base with pale tips, divided for the distal 1/3 of their length (Ref. 76967).
Life cycle and mating behavior
Maturities | Reproduktion | Spawnings | Egg(s) | Fecundities | Larver
Didier, D.A., 2008. Two new species of the genus Hydrolagus Gill (Holocephali: Chimaeridae) from Australia. In Last, P.R., White, W.T. & Pogonoski, J.J. (eds.): Descriptions of New Australian Chondrichthyans. CSIRO Marine and Atmospheric Research Paper no. 22. (Ref. 76967)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
Verktyg
Special reports
Download XML
Internet-källor
Estimates based on models
Preferred temperature (Ref.
123201): 2.2 - 5.7, mean 4.6 °C (based on 177 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00275 (0.00138 - 0.00549), b=3.08 (2.90 - 3.26), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
Trofisk nivå (Ref.
69278): 3.9 ±0.6 se; based on size and trophs of closest relatives
Resiliens (Ref.
120179): Mycket låg, lägsta populationsfördubblingstid mer än 14 år (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): High to very high vulnerability (65 of 100).
