Japan country information

Common names: Aka ei, Aka-ei
Occurrence: native
Salinity: marine
Abundance: scarce (very unlikely) | Ref: Sokolovskaya, T.G., A.S. Sokolovskii and E.I. Sobolevskii, 1998
Importance: minor commercial | Ref: FAO, 1994
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Reported from around Japan (Ref. 11230). Ranges from central Honshu southward. Also Ref. 637.
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/ja.html
National Fisheries Authority: http://www.maff.go.jp/eindex.html
Occurrences: Occurrences Point map
Main Ref: Masuda, H., K. Amaoka, C. Araga, T. Uyeno and T. Yoshino, 1984
National Database:

Common names from other countries

Pastenague du Pacifique, Raya látigo del Pacífico, Red stingray, ... more

Classificação / Names Nomes comuns | Sinónimos | Catalog of Fishes(Género, Espécies) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (tubarões e raias) (sharks and rays) > Myliobatiformes (Stingrays) > Dasyatidae (Stingrays) > Dasyatinae
Etymology: More on authors: Müller & Henle.

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

marinhas; estuarina demersal; oceanódromo (Ref. 51243); intervalo de profundidade 10 - 50 m (Ref. 114953). Subtropical; 43°N - 23°N (Ref. 114953)

Distribuição Países | Áreas FAO | Ecossistemas | Ocorrências | Point map | Introduções | Faunafri

Northwest Pacific: central China to northern Japan.

Length at first maturity / Tamanho / Peso / Idade

Maturity: L_m 44.0 range ? - ? cm
Max length : 200 cm TL macho/indeterminado; (Ref. 637); common length : 100.0 cm TL macho/indeterminado; (Ref. 637); peso máx. Publicado: 10.7 kg (Ref. 40637)

Descrição breve Chaves de identificação | Morfologia | Morfometria

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.

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).

Life cycle and mating behavior Maturities | Reprodução | Spawnings | Egg(s) | Fecundities | Larvas

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).

Referência principal Upload your references | Referências | Coordenador : McEachran, John | Colaboradores

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)

Categoria na Lista Vermelha da IUCN (Ref. 130435)

Quase ameaçada (NT) (A2bd); Date assessed: 27 August 2019

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Ameaça para o homem

Venomous (Ref. 637)

Utilização humana

Pescarias: espécies comerciais; Aquário: Espécies comerciais

FAO(pescarias: produção; publication : search) | FishSource | Sea Around Us

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Estimates based on models

Preferred temperature (Ref. 115969): 21.4 - 29, mean 28.1 (based on 510 cells).

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5010 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00646 (0.00265 - 0.01571), b=3.06 (2.86 - 3.26), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Nível Trófico (Ref. 69278): 3.8 ±0.58 se; based on food items.

Resiliência (Ref. 120179): Baixo, tempo mínimo de duplicação da população 4,5 - 14 anos (K=0.1; Fec=1).

Fishing Vulnerability (Ref. 59153): Very high vulnerability (90 of 100).

Climate Vulnerability (Ref. 125649): Very high vulnerability (87 of 100).

Categoria de preço (Ref. 80766): Medium.

Hemitrygon akajei (Müller & Henle, 1841)