Other possibility though, which is much more interesting, is looking at bivalves, particularly mussels.

Mussels and other bivalves do tremendous amounts of water filtration.

One type of aquaculture is devoted to the farming of bivalves such as oysters and mussels, or to freshwater fish such as carp and tilapia.

"All right, sit down, my friends, and I'll teach you everything I myself have just been taught by the Englishman H. C. Sirr!"Ned and Conseil took seats on a couch, and right off the Canadian said to me:"Sir, just what is a pearl exactly?""My gallant Ned," I replied, "for poets a pearl is a tear from the sea; for Orientals it's a drop of solidified dew; for the ladies it's a jewel they can wear on their fingers, necks, and ears that's oblong in shape, glassy in luster, and formed from mother-of-pearl; for chemists it's a mixture of calcium phosphate and calcium carbonate with a little gelatin protein; and finally, for naturalists it's a simple festering secretion from the organ that produces mother-of-pearl in certain bivalves."

Bivalves in sentence

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