Oyster colony in Farmstead World — animal in the game, and what it is on a real farm.
Oysters are bivalve shellfish that pump seawater through themselves and filter out plankton, so a farmed oyster needs no feed at all — the water does the feeding.
They are grown in bags, trays or on string in sheltered coastal water and take one to three years to reach plate size, anchoring a bed for its whole life.
Farm facts about oyster colony
Oysters are filter feeders: a single adult can filter about 190 litres (50 gallons) of water a day, so a farmed bed is fed by the sea alone. (en.wikipedia.org)
Oyster spat attach themselves to shell or rock and grow in place for one to three years, which is why a bed once seeded keeps producing on its own. (en.wikipedia.org)