Helcogramma decurrens

Tripterygiidae
Black-throated Threefin, Yellowback Threefin
  • Helcogramma decurrens, Rottnest Is, WA, Photo: Andrew Green
    Helcogramma decurrens, Rottnest Is, WA, Photo: Andrew Green
  • Helcogramma decurrens, Male, Adelaide, SA, Photo: Rick Stuart-Smith
    Helcogramma decurrens, Male, Adelaide, SA, Photo: Rick Stuart-Smith
  • Helcogramma decurrens, Jurien Bay, WA, Photo: Graham Edgar
    Helcogramma decurrens, Jurien Bay, WA, Photo: Graham Edgar
  • Helcogramma decurrens, Tumby Bay, SA, Photo: Graham Edgar
    Helcogramma decurrens, Tumby Bay, SA, Photo: Graham Edgar
  • Helcogramma decurrens,
    Helcogramma decurrens,
  • Helcogramma decurrens, Rottnest Is, WA, Photo: Andrew Green
    Helcogramma decurrens, Rottnest Is, WA, Photo: Andrew Green
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: Rocky Reef
  • Habitat Generalisation Index: 25.7
    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
Rarity
  • IUCN Threat Status: Least Concern
  • Occurrence: Common (47% 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
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