HomeFish encyclopediaRay-finned fishesPerch-like fishSleepersSlender gudgeon Slender gudgeon (Hypseleotris ejuncida) Scientific name: Hypseleotris ejuncida Hoese & Allen, 1982 The Slender gudgeon (Hypseleotris ejuncida) is a freshwater fish of the family Eleotridae. Native range: Oceania, known only from the Kimberley region of northern Western Australia (specimens collected from the Prince Regent River drainage, 260 km north of Derby). BiologyInhabits rocky pools, mostly in crevices along the shallow margins. Sexual dimorphism: F of smaller size and light colors with dorsal fins well separated; M larger size, prolonged posterior and anal ray, rounded caudal fin, posterior membrane of first dorsal fin reaches almost to the second. Reproduction: direct pairing with demersal, adhesive eggs laid on bottom after male has selected spawning site, male guards eggs until hatching. Breeding habits are probably similar to those of H. compressa.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHypseleotris ejuncidaFamilyEleotridae (Sleepers)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length6.0EnvironmentFreshwater; demersal; non-migratoryClimateTropicalDistributionOceania: known only from the Kimberley region of northern Western Australia (specimens collected from the Prince Regent River drainage, 260 km north of Derby).Conservation status (IUCN)Lower Risk: near threatened (LR/nt)Threat to humansHarmlessUsesFisheries: of no interestResilienceHigh, 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