Blue Mussel

Scientific Name: Mytilus edulis

Category: shell

Blue Mussel

Brief Description

A medium-sized edible marine bivalve mollusk with a dark, wedge-shaped shell.

Characteristics

Smooth, wedge-shaped shell with a bluish-black to brown exterior, often showing iridescent violet colors inside. They possess strong byssal threads used for attachment to hard surfaces.

Habitat

Found in the intertidal and sublittoral zones, often forming dense beds on rocks, piers, and pilings in sheltered and exposed coastlines.

When to Find It

Visible year-round at low tide during daylight hours.

Conservation Status

Generally abundant across its range, though local populations can be affected by pollution or invasive species.

Ecological Role

Provides habitat and food for numerous marine species; helps maintain water quality through filter feeding by removing phytoplankton and suspended particles.

Easily Confused With

California Mussel (Mytilus californianus), which is larger and has more prominent radial ribs on the shell.

Observation Tips

Best observed at low tide on rocky shorelines. Avoid walking directly on mussel beds as it can crush the shells and the life within.

Interesting Facts

Mussels use specialized protein fibers called byssal threads to anchor themselves so firmly to rocks that they can withstand crashing surf and high-velocity currents.