HomeFish encyclopediaRay-finned fishesPerch-like fishMojarrasLongspine silverbiddy Longspine silverbiddy (Gerres macracanthus) Scientific name: Gerres macracanthus Bleeker, 1854 The Longspine silverbiddy (Gerres macracanthus) is a brackish-water fish of the family Gerreidae. Native range: Indo-West Pacific, Red Sea and East Africa to Indonesia and New Guinea. BiologySimilar to G. filamentosus with the long filament on the dorsal fin but instead of spots, it has bars along the sides.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGerres macracanthusFamilyGerreidae (Mojarras)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length30.0EnvironmentMarine; brackish; demersalClimateTropicalDistributionIndo-West Pacific: Red Sea and East Africa to Indonesia and New Guinea.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