Elasmobranchii (hajar och rockor) (sharks and rays) >
Myliobatiformes (Stingrays) >
Dasyatidae (Stingrays) > Dasyatinae
Eponymy: The original description has no etymology but, though the binomial looks as if it could be an eponym, it is merely a translation: aka is Japanese for red, referring to its bright orange-red underside and jei is Japanese for ray/skate. (Ref. 128868), visit book page.
More on authors: Müller & Henle.
Miljö: miljö / Klimatzon / djupintervall / distributionsområde
Ekologi
marina; brackvatten bottenlevande; havsvandrande (Ref. 51243); djupintervall 10 - 50 m (Ref. 114953). Subtropical; 43°N - 23°N (Ref. 114953)
Northwest Pacific: central China to northern Japan.
Längd vid första mognad / Storlek / Vikt / Ålder
Könsmognad: Lm 44.0  range ? - ? cm
Max length : 200 cm TL hane/ej könsbestämd; (Ref. 637); common length : 100.0 cm TL hane/ej könsbestämd; (Ref. 637); publicerad maxvikt: 10.7 kg (Ref. 40637)
Disc rhomboid, anterior margin straight, posterior margin convex. Snout triangular and slightly produced. dorsal keel present on tail. Adults with small spines on disc and posterior part of tail. Brown dorsally and some with orangish pectoral fin margins, in front of eyes, behind spiracles, on the sides of the tail just anterior to the sting. Ventrum orangish red.
Body shape (shape guide): other.
Found in coral reefs and estuarine areas, on sand and mud bottoms (Ref. 12951, 11230). Feeds on small fishes and crustaceans (Ref. 9840). Ovoviviparous with litters of only 1 pup (Ref. 114953) while earlier estimates indicated production of up to 10 in a litter (Ref. 12951). Caught occasionally by bottom trawl fisheries operating inshore. Utilized for its meat but of limited value due to its small size (Ref.58048). Served in 'miso' soup, hard boiled with seasonings, or for 'kamaboko' material (Ref. 637).
Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures (Ref. 50449). Distinct pairing with embrace (Ref. 205).
Last, P.R., W.T. White, M.R. de Carvalho, B. Séret, M.F.W. Stehmann and G.J.P. Naylor, 2016. Rays of the world. CSIRO Publishing, Comstock Publishing Associates. i-ix + 1-790. (Ref. 114953)
Status på IUCN:s rödlista (Ref. 130435: Version 2025-2)
Mänskliga användningsområden
Fiskeri: kommersiell; sportfisk: ja; Akvarium: Kommersiell
Verktyg
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Uppskattningar baserade på modeller
Önskad temperatur (Ref.
123201): 21.4 - 29, mean 28.1 °C (based on 510 cells).
Index för fylogenetisk mångfald (Ref.
82804): PD
50 = 0.5005 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00468 (0.00195 - 0.01123), b=3.12 (2.92 - 3.32), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trofisk nivå (Ref.
69278): 3.8 ±0.58 se; based on food items.
Resiliens (Ref.
120179): Låg, lägsta populationsfördubblingstid 4,5-14 år (K=0.1; Fec=1).
Sårbarhet i fisket (Ref.
59153): Very high vulnerability (90 of 100).
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Sårbarhet för klimatet (Ref.
125649): Very high vulnerability (87 of 100).
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