What is the term for the shells or substrate on which oyster larvae settle?

What is the term for the shells or substrate on which oyster larvae settle?

• A. Cilia
• B. Dredge
• C. Byssus
• D. Clutch

Answer: (D)

The surface on which oyster larvae settle is called cultch. Cultch refers to the shells or other hard materials placed in the culture area to provide a suitable attachment surface for the settling spat. Providing a good cultch is essential because spat (the settled larvae) need a stable, solid surface to anchor themselves and grow into juveniles. Cilia are hairlike structures used by many larvae and aquatic organisms for movement and feeding, not for describing the settlement substrate. Byssus refers to the attachment fibers some adult bivalves produce to anchor themselves to surfaces, not the substrate themselves. A clutch is a term for a group of eggs laid by a female, not the surface on which larvae settle. Dredge is gear used for harvesting, not the substrate.

The surface on which oyster larvae settle is called cultch. Cultch refers to the shells or other hard materials placed in the culture area to provide a suitable attachment surface for the settling spat. Providing a good cultch is essential because spat (the settled larvae) need a stable, solid surface to anchor themselves and grow into juveniles.

Cilia are hairlike structures used by many larvae and aquatic organisms for movement and feeding, not for describing the settlement substrate. Byssus refers to the attachment fibers some adult bivalves produce to anchor themselves to surfaces, not the substrate themselves. A clutch is a term for a group of eggs laid by a female, not the surface on which larvae settle. Dredge is gear used for harvesting, not the substrate.