Syngnathus acus Linnaeus, 1758
Greater pipefish
Syngnathus acus
photo by Patzner, R.

Family:  Syngnathidae (Pipefishes and seahorses), subfamily: Syngnathinae
Max. size:  50 cm TL (male/unsexed)
Environment:  demersal; brackish; marine; depth range 0 - 110 m, non-migratory
Distribution:  Eastern 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 (Ref. 4127). Also throughout the Mediterranean, Aegean and Black seas. Despite literature records, occurrence in the Indo-Pacific outside South African waters lacks conclusive evidence (Ref. 4281).
Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 33-42; Anal spines: 0-0; Anal soft rays: 3-3. Light greenish to dark brown in color with variable markings (Ref. 4281). Snout cylindrical, equal to or less than eye diameter. With 18 - 19 body rings between head and dorsal fin (Ref. 35388). The snake pipefish (Entelurus aequoreus) is distinguished by the lack of pectoral and anal fins (Ref. 88171). An elongated bump on top of head behind eye (Ref. 59043).
Biology:  Found in coastal and estuarine waters to depths of at least 110 m (Ref. 4281); on sand, mud and rough bottoms. Common amongst algae and eel-grass (Zostera) (Refs. 4146, 6733, 88187). Feeds mainly on small crustaceans (Ref. 85544). It is parasitised by the monogenean Gyrodactylus eyipayipi on the body surface, inside the flute and male brood pouch (Ref. 124059).
IUCN Red List Status: Least Concern (LC); Date assessed: 07 May 2013 Ref. (130435)
Threat to humans:  harmless


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