1. material (such as oyster shells) laid down on oyster beds to catch the spat
Usage: marine biology

Examples

• The oyster farmers spread cultch across the seafloor to encourage new growth.
• Old shells make excellent cultch for oyster cultivation.
• The cultch provides a hard surface for young oysters to attach to.
• Workers collected cultch from nearby beaches for the oyster beds.
• Without proper cultch, the oyster spat cannot establish successfully.