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

Classification / Names Populärnamn | synonymer | Catalog of Fishes(Släkte, Arter) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (hajar och rockor) (sharks and rays) > Myliobatiformes (Stingrays) > Dasyatidae (Stingrays) > Dasyatinae
Etymology: More on authors: Müller & Henle.

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

marina; brackvatten bottenlevande; havsvandrande (Ref. 51243); djupintervall 10 - 50 m (Ref. 114953). Subtropical; 43°N - 23°N (Ref. 114953)

Utbredning Länder | FAO områden | Ekosystem | Förekomster | Point map | Utplanteringar | Faunafri

Northwest Pacific: central China to northern Japan.

Length at first maturity / Size / Vikt / Age

Maturity: L_m 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)

Short description Bestämningsnycklar | Morfologi | Morfometri

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 | Reproduktion | Spawnings | Egg(s) | Fecundities | Larver

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).

Main reference Upload your references | referenser | Koordinator : McEachran, John | Medarbetare

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)

IUCN Red List Status (Ref. 130435)

Near Threatened (NT) (A2bd); Date assessed: 27 August 2019

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Venomous (Ref. 637)

Human uses

Fiskeri: kommersiell; Akvarium: Kommersiell

FAO(fiskeri: produktion; publication : search) | FishSource | Sea Around Us

Ytterligare information

Trophic ecology
Födoslag
Diet compositions
Food consumptions
Food rations
Predatorer

Ecology
Ekologi
Home ranges

Population dynamics
Growths
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversions
Recruitments
Abundances

Life cycle
Reproduktion
Maturities
Fecundities
Spawnings
Spawning aggregations
Egg(s)
Egg developments
Larver
Larvdynamik

Distribution
Länder
FAO områden
Ekosystem
Förekomster
Utplanteringar
BRUVS - Videos

Anatomy
Gill areas
Hjärnstorlek
Otoliths

Physiology
Body compositions
Nutrients
Oxygen consumptions
Swimming type
Swimming speeds
Visual pigment(s)
Fiskljud
Diseases / Parasites
Toxicities (LC50s)

Genetics
Genetik
Electrophoreses
Heritabilities

Human related
Aquaculture systems
Vattenbruksprofiler
Avelslinjer
Ciguatera cases
Stamps, coins, misc.

Outreach
Medarbetare

Taxonomy
Populärnamn
synonymer
Morfologi
Morfometri
Bilder

References
referenser

Verktyg

Special reports

Check for Aquarium maintenance | Check for Species Fact Sheets | Check for Aquaculture Fact Sheets

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Summary page | Point data | Populärnamn | Photos

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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).

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).

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

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

Price category (Ref. 80766): Medium.

Hemitrygon akajei (Müller & Henle, 1841)