Helcogramma decurrens

Black-throated threefin, yellowback threefin
Helcogramma decurrens
Helcogramma decurrens, Rottnest Is, WA, Photo: Andrew Green
Helcogramma decurrens
Helcogramma decurrens, male, Adelaide, SA, Photo: Rick Stuart-Smith
Helcogramma decurrens
Helcogramma decurrens, Jurien Bay, WA, Photo: Graham Edgar
Helcogramma decurrens
Helcogramma decurrens, Tumby Bay, SA, Photo: Graham Edgar
Helcogramma decurrens
Helcogramma decurrens0
Helcogramma decurrens
Helcogramma decurrens, Rottnest Is, WA, Photo: Andrew Green
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Helcogramma decurrens
Helcogramma decurrens
Helcogramma decurrens
Helcogramma decurrens
Helcogramma decurrens
Helcogramma decurrens

Distribution

Temperate Australasia


Description

Yellow upper and black lower colouration of the male. The female is drab by comparison, possessing a lighter-coloured body spotted with red, brown or mustard-coloured flecks.


Information

Max Size: 5 cm

Sea Temperature Range: 13.1-23.7°C

Depth: 0-15 m

Habitat Generalization Index: 25.65

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: Least Concern

Occurrence: Common (47.4% 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 (5 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