HomeFish encyclopediaRay-finned fishesPerch-like fishGobiesDay's goby Day's goby (Acentrogobius dayi) Scientific name: Acentrogobius dayi Koumans, 1941 The Day's goby (Acentrogobius dayi) is a marine fish of the family Gobiidae. Native range: Western Indian Ocean, Persian Gulf to Pakistan. BiologyDorsal spines (total): 7; Dorsal soft rays (total): 10; Anal spines: 1; Anal soft rays: 9. Caudal fin rounded, a little shorter than head.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAcentrogobius dayiFamilyGobiidae (Gobies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length11.0EnvironmentMarine; demersalClimateTropicalDistributionWestern Indian Ocean: Persian Gulf to Pakistan.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