Ostorhinchus cookii

Cooks cardinalfish | Black-banded Cardinalfish | Cook's Cardinalfish | Apogon cookii
Ostorhinchus cookii
Ostorhinchus cookii, adult, Photo: Rick Stuart-Smith


Tropical Indo-Pacific


Five full dark stripes and a half stripe through top of eye, which are wider than white inter-spaces. Mid stripe ends in large black spot on tail base, which has white margin, unlike in Apogon limenus, which also has pink tinge to fins.


Max Size: 10 cm

Sea Temperature Range: N/A

Depth: 1-10m

Habitat Generalization Index: 10.49

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 (9.7% 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