DIVE-SEEK field image · species photo unavailableinvertebrate · bivalve
Giant clam
Tridacna gigas
The largest bivalve on the reef, with an iridescent patterned mantle.
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Quick facts
The Giant clam (Tridacna gigas) is a marine species divers can encounter. Typical size: 80–120 cm. Usually seen at 3–20 m depth. Where to see it: Palau and Great Barrier Reef.
Summarised from DIVE-SEEK's recorded catalogue data; omitted values are not yet recorded.
Taxonomic rank
species
Typical size
80–120 cm (body_length)
Maximum size
137 cm
Typical depth
3–20 m
Maximum depth
20 m
Conservation status
Research in progress
Photography difficulty
1 /5
Activity pattern
Diurnal mantle extension.
Description
Accepted name confirmed via WoRMS (AphiaID 207670). Conservation status not populated pending a verified Red List reading.
Habitat
Shallow, well-lit coral reef flats and lagoons.
Behaviour
Sits fixed in the reef with the mantle extended, snapping shut when shaded.
Diet
Filter feeding plus sugars from symbiotic algae in the mantle.
Social behaviour
Solitary, fixed in place.
Photography notes
A stationary subject that closes when your shadow lands on it. Approach from the side, light the mantle pattern evenly.
Ask about Giant clam
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Where to see it
Destinations
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Provenance — each verified claim is linked to its source as records are published.