Tridacna gigas
giant clam
![Tridacna sp. [cf noae]](https://images.reeflifesurvey.com/1/species_9e_6695d1ce1e07f.w400.h266.jpg)
Distribution
Description
The largest of the giant clam species, attaining to 137cm long and 500kg. Usually free-living on either sand or hard reef substrata. Shell is elongate-oval to fan-shaped with a small byssal orifice. Upper shell margins exhibit distinctive elongate, triangular projections. Mantle mostly dull brown and olive green, with numerous hyaline organs along the mantle edge bordered by irridescent blue-green circles. Incurrent siphon bears no guard tentacles.
Information
Max Size: 13700 cm
Sea Temperature Range: 23.4-30.7°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: Vulnerable
Occurrence: Infrequent (7.8% 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: Jo Schmid