Physical 

A common bivalve mussel, M. edulis possesses a smooth shell with pointed terminal beaks, edged with small fine teeth. The shell is glossy blue black, and the interior is a shade of violet. Average size is 2 to 4 inches in length.

Image by ‘Benutzer:Darkone’ on Wikimedia

Habitat

Blue Mussels range from the Arctic Circle to South Carolina in estuaries to several hundred feet offshore. Individuals form shoals by attaching themselves to any solid anchored structure.

Feeding 

Blue Mussels are filter-feeders that consume plankton in the water column.