HomeFish encyclopediaRay-finned fishesMulletsMulletsMountain mullet Mountain mullet (Agonostomus monticola) Scientific name: Agonostomus monticola Bancroft, 1834 The Mountain mullet (Agonostomus monticola) is a freshwater fish of the family Mugilidae. In the aquarium it needs water at 20–31°C (68–88°F). Native range: North to South America, North Carolina, Florida, Louisiana and Texas in the USA to Colombia and Venezuela, including the West Indies. Mountain mullet care at a glanceTemperature20–31°C (68–88°F) BiologyAdults live in freshwater rivers and streams. Young are encountered occasionally in brackish waters. This is the only mullet that ascends far inland and spends all its adult life in freshwater. Tend to be few and solitary in upper streams, but form uneven schools in larger streams at lower elevations. Oviparous, eggs are pelagic and non-adhesive. Usually spawn during the rainy season. Caught and consumed by local populations in some parts of central America.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAgonostomus monticolaFamilyMugilidae (Mullets)OrderMugiliformes (Mullets)ClassActinopterygii (Ray-finned fishes)Maximum length36.0EnvironmentMarine; freshwater; brackish; pelagic-neritic; catadromousClimateSubtropicalDistributionNorth to South America: North Carolina, Florida, Louisiana and Texas in the USA to Colombia and Venezuela, including the West Indies.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: subsistence fisheriesResilienceHigh, minimum population doubling time less than 15 months (Fec = 128,827) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026