2 TO 3 INCHES WHEN FARMED, THESE MUSSELS ARE OFTEN FARM RAISED IN EUROPE AND ALONG BOTH COASTS OF NORTH AMERICA. IN PARTICULAR, MAINE AND PRINCE EDWARD ISLAND ARE LARGE PRODUCERS OF MUSSELS. WITH A RICH, SWEET TASTE THEY ARE LIKE A BLEND OF OYSTERS AND CLAMS BUT ARE LESS SOFT THAN CLAMS. THEIR SHELLS WILL CLOSE TIGHTLY LIKE A CLAM.