Bathyraja abyssicola, Deep-sea skate

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Bathyraja abyssicola (Gilbert, 1896)

Deep-sea skate
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Bathyraja abyssicola   AquaMaps   Data sources: GBIF OBIS
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drawing shows typical species in Arhynchobatidae.

Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (sharks and rays) > Rajiformes (Skates and rays) > Arhynchobatidae (Softnose skates)
Etymology: Bathyraja: Greek, bathys = deep + Latin, raja, -ae = a ray (Raja sp) (Ref. 45335);  abyssicola: From the Latin 'abyssos' meaning bottomless and 'cola' meaning living at depths; referring to its deep-sea habitat..
More on author: Gilbert.

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; bathydemersal; depth range 362 - 2910 m (Ref. 50610). Deep-water

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

North Pacific: Bering Sea; south to the Galapagos Islands, west to Japan.

Length at first maturity / Size / Weight / Age

Maturity: Lm ?  range ? - 147 cm
Max length : 135 cm TL male/unsexed; (Ref. 126515); 157.0 cm TL (female)

Short description Morphology | Morphometrics

This large, rhomboidal skates (to at least 157 cm TL) have a triangularly shaped disc (width 44.2-63.7% TL), long head length (19.7-27.8% TL), and with rounded pectoral apices; claspers are very long and slender, the tips conspicuously bulbous, large and wide pseudosiphon present, length 20.0% of clasper, with a distinct, curved pseudorhipidion, the inner surface with a defined V-shaped cleft; ventral lobe with a rounded projection; teeth in 27-39 rows on upper jaw, 24-34 rows on lower jaw; pectoral radials 82; pelvic fins 19; total vertebrae 139; the dorsal and ventral surface of disc with prickly dermal denticles and with thorns on dorsal surface of disc, the males with a well-developed alar thorns, no malar thorns, middorsal thorns weak or absent (0-2), the scapulars often none, nuchal thorns strong (2-4), tail thorns moderate (15-30), down the length of tail, interdorsals are weak or obsolete (0-1). Colouration: dorsal dark brown or black-grey, sometimes with small dark blotches scattered on body, the pectoral fin edges are darker than the rest of body, pelvic fins often with whitish anterior tips while ventral is darker than dorsal surface, usually white around the mouth, gills, and cloaca (Ref. 126515).

Biology     Glossary (e.g. epibenthic)

This species lives in deep waters, on the upper continental slope and often over fine sediment; reported to have a preference for colder temperatures than its congeners. The size at maturity for males is from 109 to 120 cm TL, for females 145 cm TL; size at birth uncertain, with the smallest free-swimming specimen measured 19 cm TL. Feeds on annelids, cephalopods, crabs, shrimps, and bony fishes, the smaller individuals consume more invertebrates (Ref. 126515). Oviparous. Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (Ref. 205). Eggs are oblong capsules with stiff pointed horns at the corners deposited in sandy or muddy flats (Ref. 205). The light golden brown egg cases are large (10.8-11.1 cm TL), with coarse surface due to the rasp-like denticles; with a distinct groove between the lateral keel and the case (absent in all other ENP skate egg cases) and with horns at the corners, the anterior horns more robust than posteriors, with both sets becoming flat and thread-like at tips (Ref. 126515).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (Ref. 205).

Main reference Upload your references | References | Coordinator : McEachran, John | Collaborators

Knuckey, J.D.S. and D.A. Ebert, 2022. A taxonomic revision of Northeast Pacific softnose skates (Rajiformes: Arhynchobatidae: Bathyraja Ishiyama). Zootaxa 5142(1):1-89. (Ref. 126515)

IUCN Red List Status (Ref. 130435)

  Data deficient (DD) ; Date assessed: 24 November 2014

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

FAO - Publication: search | FishSource |

More information

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Internet sources

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: genus, species | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GenBank: genome, nucleotide | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | Tree of Life | Wikipedia: Go, Search | World Records Freshwater Fishing | Zoological Record

Estimates based on models

Preferred temperature (Ref. 123201): 2.3 - 4.6, mean 2.8 °C (based on 206 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00513 (0.00253 - 0.01042), b=3.12 (2.95 - 3.29), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245).
Trophic level (Ref. 69278):  4.1   ±0.7 se; based on size and trophs of closest relatives
Resilience (Ref. 120179):  Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Fishing Vulnerability (Ref. 59153):  Very high vulnerability (90 of 100).