Five species of seahorse have been recorded in South Australian waters. Their conservation statuses are generally regarded as data deficient, yet all are fully protected from fishing or collection in South Australian waters, under the Fisheries Management Act 2007.

Observation records on iNaturalist suggest that the Short snouted seahorse (Hippocampus breviceps) is the most commonly encountered by divers or snorkellers.

Genus Species Common name Described
Hippocampus breviceps Short snouted seahorse 1869, Peters
Hippocampus abdominalis Bigbelly seahorse 1827, Lesson
Hippocampus whitei Common seahorse 1855, Bleeker
Hippocampus bleekeri Australian pot-belly seahorse 1908, Fowler
Hippocampus tristis Dull seahorse 1872, Castelnau

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