HomeFish encyclopediaRay-finned fishesPerch-like fishMojarrasStrongspine silver-biddy Strongspine silver-biddy (Gerres longirostris) Scientific name: Gerres longirostris Lacep?de, 1801 The Strongspine silver-biddy (Gerres longirostris) is a freshwater fish of the family Gerreidae. Native range: Indo-Pacific, Red Sea and South Africa to the Marquesas Islands, north to the Ryukyu Islands, south to Australia. BiologyAdults often in clear coastal waters up to about 50 m depth; juveniles often in estuaries or lagoons influenced by fresh water; prefers shallow waters over sandy bottoms, from coral reefs to brackish waters. Occurs singly or in groups. In the Gilberts, it forms spawning aggregations for a few days around the new moon. Sold fresh in markets; processed into fishmeal.Feeds on small bottom invertebrates. Also taken with stake-nets.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGerres longirostrisFamilyGerreidae (Mojarras)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length37.0Common length20.0EnvironmentMarine; freshwater; brackish; reef-associated; amphidromousClimateTropicalDistributionIndo-Pacific: Red Sea and South Africa to the Marquesas Islands, north to the Ryukyu Islands, south to Australia.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tmax=9; k=0.23-0.29) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026