skip to content


Giant Clam

Enormous shellfish lives for 100 years


This enormous shellfish, an inhabitant of tropical seas, is the world’s largest bivalve mollusc alive today and the heaviest of all living bivalve molluscs.  Specimens grow up to 1.3 m and can weigh up to 300 kg.  Despite its large size the Giant Clam only lives for about 100 years, far less than some other molluscs. It is a bivalve mollusc, meaning it has two shells, like mussels, razor shells and scallops. It feeds on tiny floating animals and plants as well as the sugars produced by the single-celled creatures called Zooanthellae that live in the Clam's body.