Tridentiger trigonocephalus

Trident Goby
Tridentiger trigonocephalus
Tridentiger trigonocephalus, adult, Victoria, Australia, Photo: Rick Stuart-Smith
Tridentiger trigonocephalus
Tridentiger trigonocephalus, Northern Honshu, Japan, Photo: Graham Edgar
Tridentiger trigonocephalus
Tridentiger trigonocephalus, adult, Geelong, Victoria, Photo: Andrew Green
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Tridentiger trigonocephalus
Tridentiger trigonocephalus
Tridentiger trigonocephalus


Temperate Australasia, Temperate northern Pacific


Large goby with blunt head, eyes well forward on head. Alternating narrow light stripes and darker wider stripes along the side. May display several roughly H-shaped dark blotches on the side. Base body colour white to light grey to yellowish. Introduced from Japan to Port Phillip Bay, Victoria (e.g. Corio Bay, Geelong area). Found in muddy / silty areas, e.g. under jetties.


Max Size: 11 cm

Sea Temperature Range: 5.7-26.1°C

Depth: N/A

Habitat Generalization Index: N/A

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 (4.5% 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: Few (2 per transect)

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

Edit by: Andrew Green