HomeFish encyclopediaRay-finned fishesPerch-like fishGobiesSlender mudskipper Slender mudskipper (Zappa confluentus) Scientific name: Zappa confluentus Roberts, 1978 The Slender mudskipper (Zappa confluentus) is a freshwater fish of the family Gobiidae. Native range: Oceania, known only from the lower parts of the Fly, Ramu and Bintuni Rivers in New Guinea. BiologyDorsal spines (total): 7; Dorsal soft rays (total): 24-29; Anal spines: 1; Anal soft rays: 23 - 28Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameZappa confluentusFamilyGobiidae (Gobies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length4.4EnvironmentMarine; freshwater; brackish; demersal; amphidromousClimateTropicalDistributionOceania: known only from the lower parts of the Fly, Ramu and Bintuni Rivers in New Guinea.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