Gymnosarda unicolor

Dogtooth Tuna | Dog Tuna | Peg-tooth Tuna | Scaleless Tuna | White Tuna | White-flesh Tuna
Gymnosarda unicolor
Gymnosarda unicolor, Photo: Rick Stuart-Smith
Gymnosarda unicolor
Gymnosarda unicolor, Seychelles, Photo: Rick Stuart-Smith
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Gymnosarda unicolor
Gymnosarda unicolor


Tropical Indo-Pacific


Torpedo-shaped, two-tone body, grey-blue on back and silver below. White tips on dorsal and anal fins, black tips on tail, obvious lateral line which dips down to lower body at mid body and large mouth with large teeth. Found along walls, bommies and reef passes near deep water.


Max Size: 248 cm

Sea Temperature Range: 22.3-31.4°C

Depth: 10-250 m

Habitat Generalization Index: 2.83

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: Least Concern

Occurrence: Infrequent (2.3% 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: Solitary (1 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.

Edit by: Joe Shields