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Gerres akazakii Iwatsuki, Kimura & Yoshino, 2007

Japanese tenspined silver-biddy
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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

Классификация / Names народные названия | синонимы | Catalog of Fishes(род, виды) | 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 экология

морской; солоноватоводный демерсальный; пределы глубины 2 - 3 m (Ref. 58476).   Subtropical

распространение страны | регионы FAO | Ecosystems | места находок | Point map | интродукции | Faunafri

Northwest Pacific: likely to be endemic in Japan.

Size / Вес / Возраст

Maturity: Lm ?  range ? - ? cm
Max length : 16.9 cm SL самец/пол неопределен; (Ref. 58476)

Краткое описание определительные ключи | морфология | морфометрия

колючие лучи спинного плавника (общее число) : 10; членистые (мягкие) лучи спинного плавника (общее число) : 9; колючие лучи анального плавника: 3; членистые (мягкие) лучи анального плавника: 7.

биология     глоссарий (например 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 Maturities | размножение | Spawnings | Egg(s) | Fecundities | личинки

Основная ссылка Upload your references | ссылки | координатор : Woodland, David J. | соавторы

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)

Статус Красного Списка МСОП (Ref. 130435)


CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Угроза для людей





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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).
Trophic level (Ref. 69278):  3.3   ±0.3 se; based on size and trophs of closest relatives
устойчивость к внешним воздействиям (Ref. 120179):  высокий, минимальное время удвоения популяции до 15 месяцев (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153):  Low vulnerability (11 of 100).