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Surf Clam, Bar Clam, Hen Clam (and sometimes Sea Clam)

Spisula solida Linnaeus

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By Alan Davidson

Published 1980

  • About

Family Mactridae

REMARKS Maximum length about 16 cm. The shell is thick (hence another name ‘thick trough shell’) and smooth, creamy brown in colour with a periostracum of much the same hue. This is a species of the eastern coasts of North America and is particularly abundant off the New Jersey coast. It is of considerable commercial importance. Almost three quarters of the clams harvested in the whole of the United States are of this one species; but it is less important in Canada.

Although the species is known as surf clam, or bar clam, because the early settlers found them there, it really belongs to deeper offshore waters, whence it is often washed up on to beaches. A fisherman at Wellfleet on Cape Cod told me that after a recent hurricane large numbers of them had been washed up on the ocean side of the Cape; some as big as 20 cm across. He said that it was pathetic to see them gaping open and trying to manoeuvre themselves back into the sea. Meanwhile, the seagulls were ‘having a ball’. They are accustomed to swooping down, picking a clam off the beach and flying over to the nearest parking-lot, where they drop the creature on to the ‘black-top’. (I thought at first that he meant a motor-car with a black roof, but then realized that black-top means the surface of the parking-lot.) The effect of this is to shatter the shell of the clam, which the seagull proceeds to eat. However, on this occasion the seagulls found that they could just get the clams off the ground but could not then make it over to the parking-lot, since they were so heavy.

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