HomeFish encyclopediaRay-finned fishesPipefishes and SeahorsesPipefishes and seahorsesGreater pipefish Greater pipefish (Syngnathus acus) Scientific name: Syngnathus acus Linnaeus, 1758 The Greater pipefish (Syngnathus acus) is a brackish-water fish of the family Syngnathidae. BiologyFound in coastal and estuarine waters to depths of at least 110 m; on sand, mud and rough bottoms. Common amongst algae and eel-grass (Zostera). Feeds on copepods, amphipods and decapod crustaceans. Ovoviviparous. The male carries the eggs in a brood pouch which is found under the tail.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSyngnathus acusFamilySyngnathidae (Pipefishes and seahorses)OrderSyngnathiformes (Pipefishes and Seahorses)ClassActinopterygii (Ray-finned fishes)Maximum length50.0Depth range0–110 m (0–361 ft)EnvironmentMarine; brackish; demersal; depth range 0 - 110 m, usually 3 - 12 mClimateSubtropicalDistributionEastern Atlantic: Norway, Faroes and British Isles to Western Sahara, Senegambia, and from Namibia to Cape of Good Hope and northward to the coast of Zululand in the western Indian Ocean. Also throughout the Mediterranean, Aegean and Black seas. Despite literature records, occurrence in the Indo-Pacific outside South African waters lacks conclusive evidence.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Fec=200) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026