分類 / Names
共通名の | 類義語 | Catalog of Fishes(部類, 種) | ITIS | CoL | WoRMS | Cloffa
板鰓亜鋼(サメとエイ類) (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.
Environment: milieu / climate zone / depth range / distribution range
生態学
海 底生の; 深さの範囲 20 - 1450 m (Ref. 56527), usually 120 - 450 m (Ref. 56527). Boreal; 2°C - 7°C (Ref. 56527)
North Pacific: Bering Sea to southeastern Alaska.
Length at first maturity / サイズ / 重さ / 年齢
Maturity: Lm 90.5, range 81 - 95 cm
Max length : 135 cm TL オス/雌雄の選別がない; (Ref. 85855); 最大公表体重: 18.2 kg (Ref. 56527)
簡単な記述
検索表 | 形態学 | 形態計測学
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).
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).
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 幼生
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).
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)
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インターネットの情報源
Estimates based on models
Preferred temperature (Ref.
123201): -0.5 - 5.8, mean 1.5 °C (based on 556 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00312 - 0.00485), b=3.10 (3.05 - 3.15), in cm total length, based on LWR estimates for this species (Ref.
93245).
栄養段階 (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.
回復力 (Ref.
120179): 低い, ４．５年～１４年の倍増期間の最小個体群 (Fec assumed to be <100).
Prior r = 0.12, 95% CL = 0.08 - 0.18, Based on 1 full stock assessment.
Fishing Vulnerability (Ref.
59153): High to very high vulnerability (69 of 100).
