Diodon hystrix

Spotted porcupinefish | Black-spotted Porcupinefish | Giant Porcupinefish | Hedgehog Fish | Spotfin Porcupinefish
Diodon hystrix
Diodon hystrix, Photo: Rick Stuart-Smith
Diodon hystrix
Diodon hystrix, Barrow Island, WA, Australia, Photo: Graham Edgar
Diodon hystrix
Diodon hystrix, Solitary Is, NSW, Australia, Photo: Andrew Green
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Diodon hystrix
Diodon hystrix
Diodon hystrix


Temperate Africa, Temperate Australasia, Temperate South America, Temperate northern Atlantic, Temperate northern Pacific, Tropical Atlantic/Caribbean, Tropical Eastern Pacific, Tropical Indo-Pacific


Numerous black spots over body and on fins. Lacking dark bars of Dicotylichthys punctulatus (threebar porcupinefish), and shorter spines than D. holocanthus (freckled porcupinefish).


Max Size: 91 cm

Sea Temperature Range: 18.7-31.4°C

Depth: 2-50 m

Habitat Generalization Index: 12.44

Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.

Conservation and Rarity

IUCN Status: Not Evaluated

Occurrence: Infrequent (7.2% of sites)

Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed

Abundance: Few (2 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.

Edit by: extract from RD Stuart-Smith, GJ Edgar, AJ Green, IV Shaw. 2015. Tropical Marine Fishes of Australia. Reed New Holland