HomeFish encyclopediaRay-finned fishesPerch-like fishSleepersSleepy cod Sleepy cod (Oxyeleotris lineolata) Scientific name: Oxyeleotris lineolata Steindachner, 1867 The Sleepy cod (Oxyeleotris lineolata) is a freshwater fish of the family Eleotridae. In the aquarium it needs water at 20–28°C (68–82°F). Sleepy cod care at a glanceTemperature20–28°C (68–82°F) BiologyDorsal spines (total): 7; Dorsal soft rays (total): 8-9; Anal spines: 1; Anal soft rays: 7 - 9Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameOxyeleotris lineolataFamilyEleotridae (Sleepers)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length45.0Common length20.0EnvironmentFreshwater; demersalClimateTropicalDistributionOceania: Northern Australia and central-southern New Guinea, but there are no precise locality records from New Guinea and its occurrence there needs confirmation.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (Fec = 70,000) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026