Holocéphales (chimères) (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); alphus: Greek for a white spot on the skin, referring to noticeable white spot on sides (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
Écologie
marin bathydémersal; profondeur 600 - 900 m (Ref. 57721). Tropical
Distribution
Pays | Zones FAO | Écosystèmes | Occurrences | Point map | Introductions | Faunafri
Eastern Central Pacific: Galapagos Islands.
Taille / Poids / Âge
Maturity: Lm ? range ? - ? cm
Max length : 41.9 cm TL mâle / non sexé; (Ref. 57721); 48.0 cm TL (female)
Assigned to the genus Hydrolagus based upon the absence of an anal fin. Hydrolagus alphus is distinguished by being medium in size (average PCL 321 mm) and uniform dark brown in color with a distinct white spot (4%-6% BDL) on the lateral side above the pectoral fins. Paired fins with bluish hue and white margins. The dorsal spine longer than triangular shaped first dorsal fin and extends beyond the origin of the second dorsal fin when depressed. Eyes large (40.8–44.5% HDL) and pectoral fins reaching to or beyond insertion of pelvic fins when depressed. Pelvic claspers small, not extending beyond distal edge of pelvic fin, and divided distally for one half their length with slender fleshy denticulate tips. The base of second dorsal fin is long, deeply depressed and light colored in the center, anterior and posterior regions dark, considerably greater in height than the white middle region (Ref. 57721).
Life cycle and mating behavior
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
Quaranta, K.L., D.A. Didier, D.J. Long and D.A. Ebert, 2006. A new species of chimaeroid, Hydrolagus alphus sp. nov.(Chimaeriformes: Chimaeridae) from the Galapagos Islands. Zootaxa 1377:33-45. (Ref. 57721)
Statut dans la liste rouge de l'IUCN (Ref. 130435: Version 2024-2)
Menace pour l'homme
Harmless
Utilisations par l'homme
Outils
Articles particuliers
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Sources Internet
Estimates based on models
Preferred temperature (Ref.
123201): 3.7 - 7, mean 5.7 °C (based on 7 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00331 (0.00137 - 0.00798), b=3.07 (2.86 - 3.28), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Niveau trophique (Ref.
69278): 3.7 ±0.6 se; based on size and trophs of closest relatives
Résilience (Ref.
120179): Faible, temps minimum de doublement de population : 4,5 à 14 années (Deep-water species, few large eggs.).
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (38 of 100).
