Assertion: oyster | /r/HasProperty | cultivated in three ways
Facets:
Source sentences:
text: Oysters can be cultivated in three ways, growing directly on the sea bed, on trays raised off the bottom, and on trays or ropes suspended from rafts down to depths of 10 m. Oysters growing naturally on the sea bed are harvested by dredging; dredges range in size from small ones operated by hand from rowing boats to ones with a mouth opening of about 2 m towed by powered vessels.