HomeFish encyclopediaRay-finned fishesPerch-like fishMojarrasJapanese silver-biddy Japanese silver-biddy (Gerres japonicus) Scientific name: Gerres japonicus Bleeker, 1854 The Japanese silver-biddy (Gerres japonicus) is a marine fish of the family Gerreidae. Native range: Western Pacific, Japan and China, and probably southern Korea. BiologyDorsal spines (total): 10; Dorsal soft rays (total): 9; Anal spines: 3; Anal soft rays: 7Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGerres japonicusFamilyGerreidae (Mojarras)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length20.0EnvironmentMarine; demersalClimateTemperateDistributionWestern Pacific: Japan and China, and probably southern Korea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026