Enneapterygius atrogulare, Port Stephens, NSW, Photo: Andrew Green
Enneapterygius atrogulare, Female, Great Keppel Island, QLD, Photo: Tom Davis
Female mottled brown, without any distinctive marks, though rear half of body often slightly more yellow and a pale curved line beneath eye. Male red-brown with black head. Both with narrow darkish band on tail base, but not always obvious. Similar E. rufopileus (Blackcheek Threefin) has comparatively shorter 1st dorsal fin (50% height of 2nd dorsal fin in females, 75% height in males). Males of numerous other threefin species have black heads and red/brown bodies, mostly distinguished by location.
Max Size: 5 cm
Sea Temperature Range: 16.2-25.6°C
Habitat: Coral Reef, Rocky Reef
Habitat Generalisation Index: 7.8
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
IUCN Threat Status: Not Evaluated
Occurrence: Frequent (17% 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: Several (8 per transect)
Abundance is calculated as the average number of individuals recorded per RLS transect, where present.