Élasmobranches (requins et raies) (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.
Environnement : milieu / zone climatique / profondeur / gamme de distribution
Écologie
marin; saumâtre démersal; océanodrome (Ref. 51243); profondeur 10 - 50 m (Ref. 114953). Subtropical; 43°N - 23°N (Ref. 114953)
Northwest Pacific: central China to northern Japan.
Longueur à la première maturité / Taille / Poids / Âge
Maturité: Lm 44.0 range ? - ? cm
Max length : 200 cm TL mâle / non sexé; (Ref. 637); common length : 100.0 cm TL mâle / non sexé; (Ref. 637); poids max. publié: 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).
Cycle de vie et comportement reproducteur
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
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)
Statut dans la liste rouge de l'IUCN (Ref. 130435: Version 2025-2 (Global))
Utilisations par l'homme
Pêcheries: commercial; pêche sportive: oui; Aquarium: Commercial
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Estimations basées sur des modèles
Température préférée (Réf.
123201): 21.4 - 29, mean 28.1 °C (based on 510 cells).
Indice de diversité phylogénétique (Réf.
82804): PD
50 = 0.5005 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00447 (0.00189 - 0.01058), b=3.12 (2.92 - 3.32), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Niveau trophique (Réf.
69278): 3.8 ±0.58 se; based on food items.
Résilience (Réf.
120179): Faible, temps minimum de doublement de population : 4,5 à 14 années (K=0.1; Fec=1).
Vulnérabilité de la pêche (Ref.
59153): Very high vulnerability (90 of 100).
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Vulnérabilité climatique (Ref.
125649): Very high vulnerability (87 of 100).
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