Tridacna maxima   (R├╢ding, 1798)

elongate giant clam

Native range
Reviewed map
Tridacna maxima   AquaMaps   Data sources: GBIF OBIS
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Tridacna maxima
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Classification / Names Common names | Synonyms | CoL | ITIS | WoRMS

Bivalvia | Veneroida | Cardiidae

Environment: milieu / climate zone / depth range / distribution range Ecology

Reef-associated; brackish; depth range 0 - 35 m (Ref. 348).  Tropical; 23°C - 30°C (Ref. 102835); 28°N - 37°S, 31°E - 128°W

Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions

Indo-Pacific: Egypt to Pitcairn Islands and Ogasawara, Japan to Lord Howe Island.

Length at first maturity / Size / Weight / Age

Maturity: Lm ?, range 6 - 13 cm Max length : 41.7 cm SHL male/unsexed; (Ref. 117184); common length : 25.0 cm SHL male/unsexed; (Ref. 348)

Short description Morphology

The mantle color is highly variable, ranging from bright blue to brown.

Biology     Glossary (e.g. epibenthic)

Collected for food and for the shell trade. Aquaculture trials have been done in 1998 (Ref. 348). Maximum depth from Ref. 75831. Found in coral reef flats in shallow areas (Ref. 799), reef areas of lagoons (Ref. 97298) and in intertidal areas (Ref. 75831). Mixotrophic - filter feeds and photosynthesizes via its zooxanthellae (Ref. 105208). Tridacnids derive their nutrition from uptake of dissolved matter through their epidermis and from their symbiotic zooanthella Symbiodinium microadriaticum (Ref. 107098). Life cycle: Embryos develop into free-swimming trocophore larvae, succeeded by the bivalve veliger, resembling a miniature clam (Ref. 833).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Life cycle: Embryos develop into free-swimming trocophore larvae, succeeded by the bivalve veliger, resembling a miniature clam (Ref. 833).

Main reference References | Coordinator | Collaborators

SAUP Database. 2006. (Ref. 356)

IUCN Red List Status (Ref. 115185)

CITES status (Ref. 108899)

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Human uses

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

Internet sources

BHL | BOLD Systems | CISTI | DiscoverLife | FAO(; publication : search) | GenBank (genome, nucleotide) | GloBI | GOBASE | Google Books | Google Scholar | Google | ispecies | PubMed | Scirus | Tree of Life | uBio | uBio RSS | Wikipedia (Go, Search) | Zoological Record

Estimates of some properties based on models

Preferred temperature (Ref. 115969): 24.8 - 29.3, mean 28.4 (based on 3421 cells).
Vulnerability (Ref. 71543)
Low vulnerability (25 of 100)
Price category (Ref. 80766)
Unknown