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Gerres akazakii Iwatsuki, Kimura & Yoshino, 2007

Japanese tenspined silver-biddy
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Native range | All suitable habitat | Point map | Year 2050
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Gerres akazakii   AquaMaps   Data sources: GBIF OBIS
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Image of Gerres akazakii (Japanese tenspined silver-biddy)
No image available for this species;
drawing shows typical species in Gerreidae.

Japan country information

Common names: Japanese tenspined silver-biddy, Sedaka-daimyosagi
Occurrence: endemic
Salinity: brackish
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Type locality, mouth of Kaeda River, just under Kisaki Oohashi (bridge for Route 220), Aoshima, Miyazaki, MUFS 22815 (holotype of Gerres akazakii, 16.9 cm SL, male). Known only from the Pacific coasts of Honshu I., Shikoku I., Kyushu I., and Tanega I. (Kagoshima), southern Japan (Ref. 58476).
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: Iwatsuki, Y., S. Kimura and T. Yoshino, 2007
National Database:

Common names from other countries

Sedaka-daimyosagi, ... more

Classification / Names Nombres comunes | Sinónimos | Catalog of Fishes(Género, Especie) | ITIS | CoL | WoRMS | Cloffa

> Eupercaria/misc (Various families in series Eupercaria) > Gerreidae (Mojarras)
Etymology: Gerres: Latin, gerres = a kind of anchovies; cited by Plinius;  akazakii: Named for Dr. Masato Akazaki..

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

marino; salobre demersal; rango de profundidad 2 - 3 m (Ref. 58476).   Subtropical

Distribución Países | Áreas FAO | Ecosistemas | Ocurrencias, apariciones | Point map | Introducciones | Faunafri

Northwest Pacific: likely to be endemic in Japan.

Tamaño / Peso / Age

Maturity: Lm ?  range ? - ? cm
Max length : 16.9 cm SL macho / no sexado; (Ref. 58476)

Short description Morfología | Morfometría

Espinas dorsales (total): 10; Radios blandos dorsales (total): 9; Espinas anales 3; Radios blandos anales: 7

Biología     Glosario (por ej. epibenthic)

Known to inhabit the vicinity of river mouth basins, which may be considered strongly related to a minimum winter sea temperature of 16°C (less than 100 m depth). Specimens were collected in inlet basins, river mouth basins, or on shallow sandy bottoms strongly affected by freshwater from nearby river mouths. However, this species rarely occurs in the shallow coastal area with almost no freshwater effect. One specimen (MUFS 9584, 135 mm SL, 3 July 1993), had a clearly matured or water-hardened (transparent) egg, giving an indication of the spawning season of the species (Ref. 58476).

Life cycle and mating behavior Madurez | Reproducción | Puesta | Huevos | Fecundidad | Larva

Main reference Upload your references | Referencias | Coordinador : Woodland, David J. | Colaboradores

Iwatsuki, Y., S. Kimura and T. Yoshino, 2007. A review of the Gerres subfasciatus complex from the Indo-west Pacific, with three new species (Perciformes: Gerridae). Ichthyol. Res. 54(2):168-185. (Ref. 58476)

IUCN Red List Status (Ref. 130435)

  Not Evaluated 

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans





Human uses

FAO(Publication : search) | FishSource |

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Summary page | Datos específicos | Nombres comunes | Photos

Fuentes de Internet

Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes(Género, Especie) | DiscoverLife | ECOTOX | Faunafri | Fishtrace | GenBank(genome, nucleotide) | GloBI | GOBASE | | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Scirus | SeaLifeBase | Árbol de la vida | Wikipedia(Go, búsqueda) | World Records Freshwater Fishing | Zoobank | Expediente Zoológico

Estimates based on models

Preferred temperature (Ref. 115969): 20.2 - 24.3, mean 21.6 (based on 90 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01413 (0.00602 - 0.03315), b=3.04 (2.86 - 3.22), in cm Total Length, based on LWR estimates for this Genus-body shape (Ref. 93245).
Nivel trófico (Ref. 69278):  3.3   ±0.3 se; based on size and trophs of closest relatives
Resiliencia (Ref. 120179):  Alto, población duplicada en un tiempo mínimo inferior a 15 meses (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153):  Low vulnerability (11 of 100).