What is agroup of mussels called?

A group of mussels is called a bed. Mussels are often found in large groups, attached to rocks or other hard surfaces in the water. They can form dense colonies, covering large areas of the seabed. Mussel beds are important habitats for a variety of marine life, providing food and shelter for other animals. They also play an important role in filtering the water, removing pollutants and suspended particles.