sentence: Rays are the main predator of bay scallops.
sentences_before: The main factor is the reduction in sea grasses because of the development on the coast. Bay scallop spat attach to these grasses. Another possible factor is the reduction of shark numbers. They are often fished too much. This variety of shark feeds on rays.
sentences_after: With fewer sharks, rays can freely eat scallops. This is greatly decreasing their numbers.
concept_name: ray
headings: Scallop Seafood industry Sustainability
categories: Bivalves