HomeFish encyclopediaRay-finned fishesPerch-like fishGobiesUpside-down goby Upside-down goby (Bryaninops nexus) Scientific name: Bryaninops nexus Larson, 1987 The Upside-down goby (Bryaninops nexus) is a marine fish of the family Gobiidae. Native range: Western Pacific, Japan and Australia. BiologyDorsal spines (total): 7; Dorsal soft rays (total): 7-8; Anal spines: 1; Anal soft rays: 7 - 8Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameBryaninops nexusFamilyGobiidae (Gobies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length2.3Depth range3–18 m (10–59 ft)EnvironmentMarine; reef-associated; depth range 3 - 18 mClimateSubtropicalDistributionWestern Pacific: Japan and Australia.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