Marine mussels are bivalve mollusks found in oceans worldwide. They have elongated, dark shells that are typically blue-black or brown. Mussels attach themselves to rocks and other surfaces using strong threads called byssal threads, which help them withstand strong currents and waves. They are filter feeders, consuming plankton and other small particles from the water. These creatures play a vital role in their ecosystems by improving water quality and providing habitat for other marine life. Mussels are also harvested for food in many cultures, valued for their nutritional benefits and unique flavor. They are often prepared in various dishes, including soups and pasta.