n. 牡蛎卵块

Cultch \Cultch\ (k?lch; 224), n. [Etymol. uncertain.]
Empty oyster shells and other substances laid down on oyster
grounds to furnish points for the attachment of the spawn of
the oyster. [Also written {cutch}.]

2. Young or seed oysters together with the shells and other
objects to which they are usually attached.
[Webster 1913 Suppl.]

3. Rubbish; d['e]bris; refuse.
[Webster 1913 Suppl.]