Chromis atrilobata

Pomacentridae
Scissortail Damselfish, Scissortail Damselfish
  • Chromis atrilobata, Galapagos Islands, Ecuador, Photo: Graham Edgar
    Chromis atrilobata, Galapagos Islands, Ecuador, Photo: Graham Edgar
  • Chromis atrilobata, Nicaragua, Photo: Rick Stuart-Smith
    Chromis atrilobata, Nicaragua, Photo: Rick Stuart-Smith
Distribution
Tropical Eastern Pacific
Description
Oval-shaped, light brown body, black scissor tail, black stripe on rear of dorsal fin, black spot at pectoral fin base, and a white spot at base of rear of dorsal fin. Forms aggregations in mid water above the reef, feeding on zooplankton.
Information
  • Max Size: 13 cm
  • Sea Temperature Range: 21.3-30.3°C
  • Depth: 1-80m
  • Habitat: Coral Reef, Rocky Reef
  • Habitat Generalisation Index: 25
    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, Exploitation
  • IUCN Threat Status: Least Concern
  • Occurrence: Widespread (60% 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: Large aggregations (387 per transect)
    Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: Joe Shields
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