Tridacna maxima (Small giant clam)


Tridacna maxima is the most common and widespread of giant clams. It is identified by the shape of its shell, that forms concentric, wave-like patterns on the outside of the shell, following the shape of the rim. Tridacna maxima is very similar to T. squamosa and T. crocea, but is usually less embedded in the coral. Color is very variable – from blue to green and brown – and is not a pattern that can be used to identify giant clams.


Stated as lower risk/conservation dependent according to the IUCN Red list. However it is mentioned that this status is in need of an update. Out of all giant clams, this species has the widest distribution.


Indo-Pacific; from the Red Sea and Southern Africa to the Pitcairn Islands and Ogasawara, Japan to Lord Howe Island and Australia (not in the Hawaiian islands). They can be found on shallow and intertidal reef flats, in a depth range of 0-25 meters.


Embryos develop into free-swimming trocophore larvae, succeeded by the bivalve veliger, resembling a miniature clam. The larvae settle to the bottom and begin building their shell.


Up to 35cm.

Prey / Predation

Giant clams feed through filter feeding and photosynthesis by their zooaxanthallae. That is why you will find them in shallower water.

Special features