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Spisula solidissima

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Title: Spisula solidissima  
Author: World Heritage Encyclopedia
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Subject: Clam, Periostracum
Publisher: World Heritage Encyclopedia

Spisula solidissima

Atlantic surf clam
A 15 cm adult shell of Spisula solidissima from Long Beach, Long Island, New York State. Right valve at the top, left valve at the bottom.
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Veneroida
Family: Mactridae
Genus: Spisula
Species: S. solidissima
Binomial name
Spisula solidissima
(Dillwyn, 1817)

The Atlantic surf clam, also referred to as the "bar clam," "hen clam," "skimmer," or simply as the "sea clam,"[1] is a western Atlantic surf clam, a very large (20 cm), edible, saltwater clam or marine bivalve mollusk in the family Mactridae. It is a much larger relative of the eastern Atlantic surf clam.

The shell of this species is a well-known object to beach-goers in the northeastern United States. People on the beach often pick up a large empty shell of this species, either to dig in the sand with, or take home to use as a decorative dish or ashtray.

The species is exploited commercially as a food item.


This common species occurs off the east coast of the United States from Nova Scotia to South Carolina.[2]

It has also been introduced and farmed in Hokkaidō, northern Japan.


Atlantic surf clams lived buried in coarse or fine sand. They live offshore as well as in the low intertidal and surf zones.

Life habits

Surf clams that live along the New Jersey coast are believed to grow to maturity in approximately seven years, far less than previously thought, according to Rutgers research at the Haskin Shellfish Research Laboratory, in Bivalve, New Jersey .

These clams use their siphons to pull in and then filter fine particles of organic matter and plankton from the surrounding seawater, in other words, like almost all clams, they are filter feeders.

Human use

This species is a commercially exploited species, long prized for its sweet flavor. About two-thirds of a surf clam's shucked weight is viable for human consumption.[3] The meat of the clam is used as 'strips', chowder, and sushi.

The "tongue" or foot of the clam is commercially valuable because it is cut into long strips which are breaded and fried and served as "clam strips", first popularized by the Howard Johnson's franchise.

The meat that is left over is separated from the "belly" and is referred to as "salvage" within the clam industry. This meat includes the adductor muscles, which are the strong muscles that close the two halves of the shell and which tightly hold the clam's shell in the shut position. "Salvage" is typically ground up for use in chowders, sauces, and dips, and is commercially available either in cans or frozen. Locally it is available fresh.

As a side note, the substantial "belly" of the clam is used by knowledgeable fisherman as excellent bait for striped bass and other species.


  • The Long Island Shell Club, 1988. Seashells of Long Island, Long Island Shell Club Inc, New York State.

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