HomeFish encyclopediaRay-finned fishesPerch-like fishSlimys, slipmouths or ponyfishesOblong slipmouth Oblong slipmouth (Equulites stercorarius) Scientific name: Equulites stercorarius Evermann & Seale, 1907 The Oblong slipmouth (Equulites stercorarius) is a marine fish of the family Leiognathidae. Native range: Indo-West Pacific, Indonesia, Philippines, New Guinea, and Guam. Recently recorded from Tonga. BiologyDorsal spines (total): 8; Dorsal soft rays (total): 16; Anal spines: 3; Anal soft rays: 14Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEquulites stercorariusFamilyLeiognathidae (Slimys, slipmouths or ponyfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length10.2Depth range20 m (66 ft)EnvironmentMarine; reef-associated; depth range ? - 20 mClimateTropicalDistributionIndo-West Pacific: Indonesia, Philippines, New Guinea, and Guam. Recently recorded from Tonga.Conservation status (IUCN)Not EvaluatedThreat 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