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Tridacna gigas contain marine algae which are a food source for many of the fish species eaten by humans.

The lab would switch from raising the colorful species to growing the biggest of the 12 species of giant clams, Tridacna gigas.

So, they returned to Palau to take detailed measurements of light inside the clams — Tridacna derasa, T. maxima and T. crocea — with the help of a fiber-optic probe.

Tridacna, trī-dak′na, n. a genus of bivalves, the giant clam, without the shell weighing 20 lb., with the shell so much even as 500 lb.

The Tridacnidæ, whose sole genus Tridacna contains the largest specimen of the whole class of bivalves, the shells sometimes measuring two feet and more across.