Kyphosus bigibbus
Grey drummer | Brown Chub | Darkfin Drummer | Gray Chub | Gray Rudderfish | Grey Sea Chub | Insular Rudderfish | Rudderfish | Sea Chub | Silvery-Grey Perch | Southern Drummer | Stone Bream | Topsail Drummer
Distribution
Temperate Africa, Temperate Australasia, Temperate northern Pacific, Tropical Indo-Pacific
Description
Dark tail and fins, pectoral fin base with small black spot below. Difficult to identify among the drummers, but is best distinguished from K. sectatrix by the rear margin of the anal fin and the leading margin of the top tail lobe being approximately in line (due to a shorter anal fin lobe than on K. sectatrix), and from K. sydneyanus by smaller scales and all-dark tail. Can occur in large mixed schools with other drummers.
Information
Max Size: 75 cm
Sea Temperature Range: 19-29.4°C
Depth: 2-40 m
Habitat Generalization Index: 15.12
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: Infrequent (5.7% 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: Many (13 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