HomeFish encyclopediaRay-finned fishesPerch-like fishDottybacksLongfin dottyback Longfin dottyback (Manonichthys polynemus) Scientific name: Manonichthys polynemus Fowler, 1931 The Longfin dottyback (Manonichthys polynemus) is a marine fish of the family Pseudochromidae. Native range: Western Pacific, northeastern Indonesia and Palau. BiologyDorsal spines (total): 3; Dorsal soft rays (total): 27; Anal spines: 3; Anal soft rays: 14. Recognized by the long ventral fins, filamentous median fins, and yellow tear-mark below the eye. Found on steep slopes and walls with tubular sponges, usually in depths of about 20 m.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameManonichthys polynemusFamilyPseudochromidae (Dottybacks)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length12.0Depth range2–50 m (7–164 ft)EnvironmentMarine; reef-associated; depth range 2 - 50 mClimateTropicalDistributionWestern Pacific: northeastern Indonesia and Palau.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