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Tridacna gigas   (Linnaeus, 1758)

giant clam

Native range | All suitable habitat | Point map | Year 2100
This map was computer-generated and has not yet been reviewed.
Tridacna gigas   AquaMaps   Data sources: GBIF OBIS
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Image of Tridacna gigas (giant clam)
Picture by FAO

Classification Common names | Synonyms | CoL | ITIS | WoRMS

Bivalvia | Veneroida | Cardiidae

Main reference References | Biblio | Coordinator | Collaborators

SAUP Database. 2006. (Ref. 356)

Size / Weight / Age

Max length : 137 cm SHL male/unsexed; (Ref. 99323); common length : 80.0 cm SHL male/unsexed; (Ref. 348); max. published weight: 500.0 kg (Ref. 81839)


Benthic; depth range 0 - 35 m (Ref. 75831)

Climate / Range

Tropical; 23°C - 30°C (Ref. 102835); 38°N - 29°S, 92°E - 178°W

Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions

Indo-Pacific: from Myanmar then east to Wallis and Futuna, north to Japan and south to western Australia. Introduced beyond Wallis and Futuna in the Pacific.

Short description

It is white and fan-shaped with deep radiating ribs.

Biology     Glossary (e.g. epibenthic)

Known to be the largest bivalve mollusks that exist. Exploited for its meat and shell, this species has recently become nearly extinct within an important part of its range, due to over collecting. Trials of aquaculture under progress for the restocking of reefs and local farming (Ref. 348). Facultative planktotroph. It has an established symbiotic relationship with a dinoflagellate algae (zooxanthellae) which allows them to survive. It ingests the algae at an early stage and the latter propagates in the gut (Ref. 100719). Becomes simultaneous hermaphrodite in its later years. Spawning is seasonal, based on its northern and southern limits of distribution (Ref. 100714).

IUCN Red List Status (Ref. 114614)

  Vulnerable (VU) (A2cd)

CITES status (Ref. 94142)

Threat to humans

Human uses

Fisheries: commercial; aquaculture: commercial
FAO(Aquaculture: production; | FisheriesWiki | Sea Around Us

Internet sources

BHL | BOLD Systems | Check for other websites | Check FishWatcher | CISTI | DiscoverLife | FAO(; publication : search) | GenBank (genome, nucleotide) | GOBASE | Google Books | Google Scholar | Google | ispecies | National databases | PubMed | Scirus | Sea Around Us | FishBase | Tree of Life | uBio | uBio RSS | Wikipedia (Go, Search) | Zoological Record

Estimation of some characteristics with mathematical models

Vulnerability (Ref. 71543)
Very high vulnerability (82 of 100)
Price category (Ref. 80766)