HomeMarine aquarium fishGobies, blennies & dottybacksFourline blenny Fourline blenny (Ecsenius aequalis) Scientific name: Ecsenius aequalis Springer, 1988 The Fourline blenny (Ecsenius aequalis) is a marine fish of the family Blenniidae. Native range: Western Pacific, northern part of the Great Barrier Reef, off Queensland, Osprey Reef in the Coral Sea, and Trobriand Islands of Papua New Guinea. BiologyFound in shallow areas. Oviparous. Eggs are demersal and adhesive.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEcsenius aequalisFamilyBlenniidae (Combtooth blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length4.3Depth range2–11 m (7–36 ft)EnvironmentMarine; reef-associated; depth range 2 - 11 mClimateTropicalDistributionWestern Pacific: northern part of the Great Barrier Reef, off Queensland, Osprey Reef in the Coral Sea, and Trobriand Islands of Papua New Guinea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More gobies, blennies & dottybacksYellowhead jawfishOpistognathus aurifronsFire gobyNemateleotris magnificaYellow prawn-gobyCryptocentrus cinctusPersian blennyEcsenius midasBanda comb-toothEcsenius bandanusSmooth-fin blennyEcsenius frontalisSee all gobies, blennies & dottybacks SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026