Assessor macneilli

Plesiopidae
Blue Scissortail, Blue Assessor, Blue Devilfish, Macneill's Assessor, Squatter
  • Assessor macneilli, QLD, Australia, Photo: Rick Stuart-Smith
    Assessor macneilli, QLD, Australia, Photo: Rick Stuart-Smith
  • Assessor macneilli, Great Barrier Reef, Cairns, Australia, Photo: Andrew Green
    Assessor macneilli, Great Barrier Reef, Cairns, Australia, Photo: Andrew Green
  • Assessor macneilli, Torres Strait, Qld, Photo: Andrew Green
    Assessor macneilli, Torres Strait, Qld, Photo: Andrew Green
Distribution
Tropical Indo-Pacific
Description
Blue body and forked tail. Swims with dorsal fin raised giving a triangular profile. Similar A. flavissimusis (Yellow Scissortail) is yellow, and Pseudochromis dottybacks lack forked tail. Swims in groups upside down under ledges and in caves, belly aligned to reef surface.
Information
  • Max Size: 6 cm
  • Sea Temperature Range: 22.4-30.4°C
  • Depth: 2-20m
  • Habitat: Coral Reef
  • Habitat Generalisation Index: 17.7
    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
  • Threats: Climate change/warming, Habitat degradation
  • IUCN Threat Status: Not Evaluated
  • Occurrence: Common (38% 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: Many (41 per transect)
    Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: RD Stuart-Smith, GJ Edgar, AJ Green, IV Shaw. 2015. Tropical Marine Fishes of Australia. Reed New Holland
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