How are oysters harvested?

Wikipedia told me this:

"In one method the spat or seed oysters are distributed over existing oyster beds and left to mature naturally. ... Oysters cultivated in this manner may be harvested by lifting the bags or racks to the surface and removing mature oysters, or simply retrieving the larger oysters when the enclosure is exposed at low tide."

Explanation:

answeranovulation;

answerreferred pain;