Trinorfolkia clarkei

Common threefin | Norfolkia clarkei
Trinorfolkia clarkei
Trinorfolkia clarkei, Port Stephens, NSW, Photo: Tom Davis
Trinorfolkia clarkei
Trinorfolkia clarkei, Narooma, NSW, Photo: Andrew Green
Trinorfolkia clarkei
Trinorfolkia clarkei, Melbourne, VIC, Photo: Rick Stuart-Smith
Trinorfolkia clarkei
Trinorfolkia clarkei, Jervis Bay, NSW, Photo: Graham Edgar
Trinorfolkia clarkei
Trinorfolkia clarkei, Sydney, NSW, Photo: Rick Stuart-Smith
Trinorfolkia clarkei
Trinorfolkia clarkei, Photo: Toni Cooper
Trinorfolkia clarkei
Trinorfolkia clarkei, Jervis Bay, NSW, Photo: Andrew Green
Trinorfolkia clarkei
Trinorfolkia clarkei, Coffs Harbour, NSW, Photo: Ian Shaw
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Trinorfolkia clarkei
Trinorfolkia clarkei
Trinorfolkia clarkei
Trinorfolkia clarkei
Trinorfolkia clarkei
Trinorfolkia clarkei
Trinorfolkia clarkei
Trinorfolkia clarkei

Distribution

Temperate Australasia


Description

Pink or brown body with a prominent stripe below the eye. Mostly distributed in coastal reef habitats, the species also occurs in estuaries, where it is often found around jetty pylons. Two almost identical species with similar colouration and a stripe below the eye have also been recorded from the south coast. Trinorfolkia incisa, a very small species (<30 mm) found between Esperance and Wilsons Promontory, has a first dorsal fin with the webbing between the spines deeply indented. The rare SA species Trinorfolkia cristata has a first dorsal fin higher than the second; in T. clarkei it is lower.


Information

Max Size: 8 cm

Sea Temperature Range: 10.4-23.3°C

Depth: 0-30 m

Habitat Generalization Index: 10.2

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: Common (35.7% 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: GJ Edgar. 2008. Australian Marine Life. New Holland, Sydney