Arctoraja parmifera, Alaska skate : fisheries

Arctoraja parmifera (Bean, 1881)

Alaska skate
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Arctoraja parmifera
Afbeelding van Orlov, A.

Classificatie / Namen Lokale namen | Synoniemen | Catalog of Fishes(Genus, Soort(en)) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (haaien en roggen) (sharks and rays) > Rajiformes (Skates and rays) > Arhynchobatidae (Softnose skates)
Etymology: parmifera: Name from Latin 'parma' meaning shield, and 'fero' for 'to bear', likely in reference to the strong thorns along the midline. (Ref. 89865).
More on author: Bean.

Milieu: milieu / Klimaatzone / Diepte / verspreidingsgebied Ecologie

marien demersaal; diepte 20 - 1450 m (Ref. 56527), usually 120 - 450 m (Ref. 56527). Boreal; 2°C - 7°C (Ref. 56527)

Verspreiding Gebieden | FAO regio's | Ecosystemen | Voorkomen | Verspreidingskaart | Introducties | Faunafri

North Pacific: Bering Sea to southeastern Alaska.

Lengte bij maturiteit / Grootte / Gewicht / Leeftijd

Maturiteit: Lm 90.5, range 81 - 95 cm
Max length : 135 cm TL mannelijk / geslacht onbekend; (Ref. 85855); max. gepubliceerd gewicht: 18.2 kg (Ref. 56527)

Korte beschrijving Determinatiesleutels | Morfologie | Morfometrie

This species is distinguished from all other members of the subgenus Arctoraja by having a complete or, uncommonly, an incomplete row of dorsal thorns extending from the nuchal region to the interdorsal; dorsum nearly uniform brown, often with vague dark spotting and a yellowish blotch at pectoral-fin base; and two unique COI haplotypes. It is further distinguished from B. panthera by having fewer total thorns 19-36 (vs. 31-42), fewer tail thorns 15-23 (vs.19-28), internal carotid foramina widely separated (vs. foramina in a single median pit), distal portion of ventral marginal cartilage distolaterally directed and straight (vs. sinusoidal), accessory terminal 2 broadly triangular with short spike (vs. elongate with long spike), distal tip of axial cartilage bluntly rounded (vs. pointed), anterior portion of body short and narrow (vs. longer and wider); tail short (vs. longer); from B. simoterus by its wider interdorsal space 1.0-3.9% TL (vs. 0.5-1.0% TL), fewer precaudal and caudal vertebrae 32-40 and 82-89 (vs. 41 and 90), fewer tail thorns 15-23 (vs. 22-28), larger orbit 4.3-5.3% TL (vs. 2.6-4.8% TL), anterior- and posterior-most postdorsal and postventral foramina of the scapulacoracoid larger than three intervening foramina (vs. three postdorsal foramina slightly smaller posteriorly, posteriormost postventral foramina four times larger than preceding six foramina), distal projection of the ventral marginal directed distolaterally (vs. distally), ventral terminal tear-drop shaped (vs. lanceolate), and dorsal and ventral marginals extend to about a quarter the length of dorsal terminal 2 (vs. extending farther distally to distal tip of dorsal terminal 3); from B. smirnovi by its typically complete dorsal row of thorns (vs. always broadly interrupted between the nuchal and tail thorns), wider interdorsal space (1.0-3.9% TL (vs. 0.1-1.4% TL), distal projection of the ventral marginal projecting distolaterally (vs. distally), ventral terminal tear-drop shaped (vs. lanceolate), and dorsal and ventral marginals extending to about a quarter the length of dorsal terminal 2 (vs. extending farther distally to distal tip of dorsal terminal 3) (Ref. 89865).
Body shape (shape guide): other.

Biologie     Verklarende woordenlijst (bv. epibenthic)

An epi- to mesobenthic species (Ref. 89865). Large individuals are reported to feed on Pleurogrammus monopterygius and miscellaneous other fishes, while the smaller ones feed on crabs and amphipods; in the eastern Bering Sea, mature individuals feed primarily on Theragra chalcogramma, miscellaneous fishes, and Chionocetescrabs (Ref. 89865). 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). Egg capsules are 12.9-15.0 cm long and 8.9-9.1 cm wide (Ref. 41249, 41298).

Levenscyclus en paargedrag Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven

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). Eggs have horn-like projections on the shell (Ref. 205).

Hoofdreferentie Upload uw referenties | Referenties | Coördinator : McEachran, John | Medewerkers

McEachran, J.D. and K.A. Dunn, 1998. Phylogenetic analysis of skates, a morphologically conservative clade of elasmobranchs (Chondrichthyes: Rajidae). Copeia 1998(2):271-290. (Ref. 27314)

Status op de Rode Lijst van het IUCN (Ref. 130435: Version 2025-2 (Global))


CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaar voor de mens

  Harmless





Gebruik door de mens

Visserij: bycatch
FAO - Publication: search | FishSource |

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Schattingen op basis van modellen

Fylogenetische diversiteitsindex
(Ref. 82804) 		PD50 = 0.6250 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight a=0.00417 (0.00340 - 0.00511), b=3.09 (3.03 - 3.15), in cm total length, based on LWR estimates for this species (Ref. 93245).
Trofisch niveau
(Ref. 69278) 		4.2   ±0.5 se; based on diet studies.
Generation time 12.6 ( na - na) years. Estimated as median ln(3)/K based on 2 growth studies.
Weerstandsvermogen
(Ref. 120179) 		laag, minimale populatieverdubbelingstijd 4,5-14 jaar (Fec assumed to be <100).
Rate of population increase Prior r = 0.12, 95% CL = 0.08 - 0.18, Based on 1 full stock assessment.
Kwetsbaarheid van de visserij
(Ref. 59153) 		High to very high vulnerability (69 of 100). 🛈
Prijsklasse
(Ref. 80766) 		Medium.