oyster bed

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A place where oysters breed or are raised.

from The Century Dictionary.

• noun An oyster-bank; a place where oysters breed or are bred; a place prepared and sown or planted with spat.
• noun A bed, layer, or stratum containing fossil oysters.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A place on the seabed where oysters are grown to be harvested

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a workplace where oysters are bred and grown