Originally arriving in the northwest mixed among pacific oyster seed that was imported to North America during the 1940s, this sweet, even cooking clam has overtaken the native little-neck clam to become the premier clam of the region. No longer do supplies come strictly from wild harvest. Since the demand for this clam has skyrocketed, clam farming has become a means for shellfish growers to assure supply. Farmed clams come to us at a consistent size of 1 1/4 to 1 1/2 in diameter.