";} } ?> Bathyraja trachura, Roughtail skate

Bathyraja trachura (Gilbert, 1892)

Roughtail skate
Add your observation in Fish Watcher
Native range | All suitable habitat | Point map | Year 2100
This map was computer-generated and has not yet been reviewed.
Bathyraja trachura   AquaMaps   Data sources: GBIF OBIS
Upload your photos and videos
Pictures | Google image
Image of Bathyraja trachura (Roughtail skate)
Bathyraja trachura
Picture by Van Orden, W.

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).
More on author: Gilbert.

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

Marine; bathydemersal; depth range 213 - 2550 m (Ref. 80796). Deep-water; 63°N - 22°N, 144°E - 106°W

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

Northeastern Pacific: from the Bering Sea, south to gthe Gulf of California, Mexico, and to the west to the Sea of Okhotsk.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 91.0 cm TL male/unsexed; (Ref. 87722); 89.0 cm TL (female); max. published weight: 5.0 kg (Ref. 87722); max. reported age: 20 years (Ref. 87722)

Short description Morphology | Morphometrics

This moderately sized skates (91.0 cm TL) with disc length (28.7-56.7% TL) are distinguished by the following: pectorals broadly rounded, head length short (15.0-24.1% TL), preorbital length short (9.0-13.5% TL) are also distinguished by having the following: claspers short, tips relatively rounded, with large pseudosiphon and a strong, short pseudorhipidion, not reaching the tip, V-shaped cleft, projection absent; teeth in 27-36 rows on upper jaw and in 26-36 rows on lower jaw; pectoral fin radials 81; pelvics 23; total vertebrae 109; dorsal surface is covered with rough prickles, prickles on tail are larger and more robust; thorns on dorsal surface, mature males with alar thorns, no malar thorns, middorsal thorns weak or absent (0-1); nuchal thorns small or obsolete (0-3); tail thorns moderate (21-30); interdorsal thorns are small to occasionally absent (0-1). Colouration: dorsal dark purple, brown, or grey, spiracles occasionally pale, ventral coloration a lighter grey than dorsal surface, often with white blotching on mouth, gills, cloaca, and scattered across the body (Ref. 126515).

Biology     Glossary (e.g. epibenthic)

Inhabits deeper waters than hardnose skates and reported to prefer medium to cold temperatures and low oxygen environments compared to its congeners. It is found over a wide range of substrates, from fine sediment to rocky environments. Feeds mostly on benthic organisms, including annelids, shrimps, crabs, and fishes, with adults preferring fishes, whereas juveniles consume mostly invertebrates (Ref. 126515). Oviparous. Distinct pairing with embrace. Young may tend to follow large objects, such as their mother (Ref. 205). Reported size at maturity for males 74 cm TL and for females 80 cm TL with males growing to at least 90 cm TL and females at least 89 cm TL; with size at birth 9-16 cm TL. Maximum age reported estimated to be 20 years for males and 17 years for females. Egg cases small in size (6.2-7.8 cm TL), colour dark brown and becoming light golden brown on keels, which are smooth and plush-like when touched. Egg cases with long, slender horns at each corner, curving inwardly and slightly overlap at their tips with a distinct crossbar originating midway along the posterior horns in some specimens (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. 125652)

  Least Concern (LC) ; Date assessed: 06 March 2015

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

FAO - Publication: search | FishSource |

More information

Countries
FAO areas
Ecosystems
Occurrences
Introductions
Stocks
Ecology
Diet
Food items
Food consumption
Ration
Common names
Synonyms
Metabolism
Predators
Ecotoxicology
Reproduction
Maturity
Spawning
Spawning aggregation
Fecundity
Eggs
Egg development
Age/Size
Growth
Length-weight
Length-length
Length-frequencies
Morphometrics
Morphology
Larvae
Larval dynamics
Recruitment
Abundance
BRUVS
References
Aquaculture
Aquaculture profile
Strains
Genetics
Allele frequencies
Heritability
Diseases
Processing
Nutrients
Mass conversion
Collaborators
Pictures
Stamps, Coins Misc.
Sounds
Ciguatera
Speed
Swim. type
Gill area
Otoliths
Brains
Vision

Tools

Special reports

Download XML

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): 2.2 - 5.2, mean 3 °C (based on 183 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00468 (0.00289 - 0.00758), b=3.04 (2.90 - 3.18), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref. 93245).
Trophic level (Ref. 69278):  4.0   ±0.7 se; based on size and trophs of closest relatives
Generation time: 12.2 ( na - na) years. Estimated as median ln(3)/K based on 2 growth studies.
Resilience (Ref. 120179):  Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Fishing Vulnerability (Ref. 59153):  High vulnerability (57 of 100).
Nutrients (Ref. 124155):  Calcium = 10.6 [1.9, 34.3] mg/100g ; Iron = 0.241 [0.055, 0.625] mg/100g ; Protein = 15 [13, 17] % ; Omega3 = 0.439 [0.175, 1.358] g/100g ; Selenium = 16.2 [4.3, 45.2] μg/100g ; VitaminA = 13.4 [3.6, 53.1] μg/100g ; Zinc = 0.299 [0.147, 0.613] mg/100g (wet weight);