HomeFreshwater aquarium fishRainbowfish & killifishBanded killifish Banded killifish (Fundulus diaphanus diaphanus) Scientific name: Fundulus diaphanus diaphanus Lesueur, 1817 The Banded killifish (Fundulus diaphanus diaphanus) is a freshwater fish of the family Fundulidae. In the aquarium it needs water at 10–25°C (50–77°F). Banded killifish care at a glanceTemperature10–25°C (50–77°F) BiologyInhabits shallow, quiet margins of lakes, ponds and sluggish streams, usually over sand or mud and often near vegetation. Swims in schools a few inches below surface of water. Euryhaline and salinity-tolerant. Not a seasonal killifish. Is easy to maintain in the aquarium.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameFundulus diaphanus diaphanusFamilyFundulidae (Topminnows and killifishes)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length13.0Common length6.3EnvironmentFreshwater; brackish; benthopelagic; non-migratoryClimateTemperateDistributionNorth America: Atlantic Slope drainages from Newfoundland in Canada to Peedee River in South Carolina, USA; St. Lawrence-Great Lakes and Mississippi River basins from Quebec to Manitoba in Canada, and south to southern Pennsylvania, northern Illinois and northeastern Nebraska in the USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercial; bait: usuallyResilienceHigh, minimum population doubling time less than 15 months (tm More rainbowfish & killifishFlagfishJordanella floridaeBluefin killifishLucania goodeiKamaka rainbowfishMelanotaenia kamakaYellowbelly gudgeonAllomogurnda nesolepisStriped panchaxAplocheilus lineatusRedtail nothoNothobranchius guentheriSee all rainbowfish & killifish SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026