Giant Clam
Tridacna gigas
The world's biggest bivalve, powered partly by sunshine.
Giant Clams sit in bright reef shallows with a colorful mantle spread toward the sun. Tiny algae living safely in their tissues make sugars that help these mollusks grow enormous.
Find this SeaPal in the card gallery
From field guide to game table
Bring this Giant Clam home
See which ready-to-play decks feature this SeaPal. Try one in the simulator before you buy, or explore each full deck list.
Not currently in a ready-to-play deck
You can still find this SeaPal in the card gallery while planning your own custom deck.
Quick dive
Creature passport
- Home
- Shallow Indo-Pacific coral reefs, lagoons, sand, and hard reef flats.
- Favorite foods
- Food made by partner algae plus plankton filtered from water.
- Size check
- Up to 4.25 ft (1.3 m) and about 550 lb (250 kg)
Tell-your-friends facts
Four wonderfully wild things
- 1
It is the largest living bivalve on Earth.
- 2
A settled adult stays in the same patch of reef for life.
- 3
Tiny light-sensitive eyes dot the edge of the colorful mantle.
- 4
No verified human death has ever been caused by a Giant Clam.
Ocean superpower
Built to be amazing
A partnership with sun-powered algae supplies much of its food.
Junior scientist tip
What should I look for?
Look for a deeply folded shell and a blue-green patterned mantle.
Grown-up research links
We used trusted science organizations to check this profile.