HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesTopminnows and killifishesBarrens topminnow Barrens topminnow (Fundulus julisia) Scientific name: Fundulus julisia Williams & Etnier, 1982 The Barrens topminnow (Fundulus julisia) is a freshwater fish of the family Fundulidae. In the aquarium it needs water at 10–25°C (50–77°F). Native range: North America, upper Caney Fork (Cumberland River drainage) and upper Duck River (Tennessee River drainage) systems in central Tennessee, USA. Barrens topminnow care at a glanceTemperature10–25°C (50–77°F) BiologyOccur in vegetated pools and margins of springs and spring-fed headwaters and creeks (Ref 5723, 10294). 9.4 cm TL. Juveniles feed primarily on microcrustacea and midges; adults consume amphipods and isopods, small mayflies, terrestrial insects, and snails. Not a seasonal killifish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameFundulus julisiaFamilyFundulidae (Topminnows and killifishes)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length7.0EnvironmentFreshwater; benthopelagic; non-migratoryClimateTemperateDistributionNorth America: upper Caney Fork (Cumberland River drainage) and upper Duck River (Tennessee River drainage) systems in central Tennessee, USA.Conservation status (IUCN)Vulnerable (VU) (D2)Threat 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