HomeFish encyclopediaRay-finned fishesPerch-like fishJawfishesHarlequin smiler Harlequin smiler (Opistognathus eximius) Scientific name: Opistognathus eximius Ogilby, 1908 The Harlequin smiler (Opistognathus eximius) is a marine fish of the family Opistognathidae. Native range: Western Central Pacific. BiologyOccur over sand bottom of the continental shelf. Mouthbrooders. Eggs which are clumped together in a sticky egg ball inside the parent's mouth are sometimes released in a burrow during brief feeding periods.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameOpistognathus eximiusFamilyOpistognathidae (Jawfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)EnvironmentMarine; reef-associatedClimateTropicalDistributionWestern Central Pacific.Conservation status (IUCN)Not EvaluatedThreat to humansHarmless SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026