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Tridacna gigas   (Linnaeus, 1758)

giant clam
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Bivalvia | Veneroida | Cardiidae
Common names | Synonyms | CoL | ITIS | WoRMS

Main reference
SAUP Database. 2006. (Ref. 356)
References | Biblio | Coordinator | Collaborators

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 - 37°S, 38°E - 170°W

Indo-Pacific: from Comoros, to as far east as Kiribati, north to Japan and Hawaii, and south to Australia.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

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)