HomeFish encyclopediaRay-finned fishesPerch-like fishAsiatic glassfishesEstuary perchlet Estuary perchlet (Ambassis marianus) Scientific name: Ambassis marianus G?nther, 1880 The Estuary perchlet (Ambassis marianus) is a freshwater fish of the family Ambassidae. Native range: Oceania, Endemic to eastern Australia. BiologyDorsal spines (total): 7 - 8; Dorsal soft rays (total): 9-10; Anal spines: 3; Anal soft rays: 10 - 11; Vertebrae: 24. Adults have 2-4 supraorbital spines, a short-based and deeply notched dorsal fin, and are transparent and silvery with dusky scale edges.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAmbassis marianusFamilyAmbassidae (Asiatic glassfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length10.0Common length6.0EnvironmentFreshwater; brackish; demersalClimateSubtropicalDistributionOceania: Endemic to eastern Australia.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (Assuming Fec > 10,000) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026