Gerres akazakii, Japanese tenspined silver-biddy

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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drawing shows typical species in Gerreidae.

Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Teleostei (teleosts) > 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 Ecology

Marine; brackish; demersal; depth range 2 - 3 m (Ref. 58476). Subtropical

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Northwest Pacific: likely to be endemic in Japan.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 16.9 cm SL male/unsexed; (Ref. 58476)

Short description Identification keys | Morphology | Morphometrics

Dorsal spines (total): 10; Dorsal soft rays (total): 9; Anal spines: 3; Anal soft rays: 7.

Biology     Glossary (e.g. 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 Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator : Woodland, David J. | Collaborators

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: Version 2025-2)

Not Evaluated 

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans






Human uses

FAO - Publication: search | FishSource |

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