Clam

Clam is a common name for several species of bivalve mollusc. These animals have two shells of equal size connected by muscles. They also have a foot that helps them dig. Clams live both in freshwater and in the ocean. They like to hide halfway buried in the sand or mud of the sea floor or riverbeds.

Unlike oysters and mussels, which stick to surfaces, and scallops, which stay near the bottom, clams dig into the sediment. This makes them popular for clam digging. People also use clams to make tasty soups like clam chowder. Some clams, such as palourde clams, have round or triangle-shaped shells. Others, like razor clams, have long, narrow shells.

Clams are filter feeders. This means they eat by taking small food particles from the water. Their lives can be different lengths. Some live only one year, while at least one species has lived for more than 500 years. All clams have two shell halves joined by a flexible ligament. This helps protect them from predators.

Anatomy

A clam's shell has two parts called valves. These valves are linked by a hinge and a special ligament that lets them open and close. Inside, clams have simple body parts such as kidneys, a heart, a mouth, and a stomach. Many clams also have a siphon to help them eat.

Food source and ecology

Clams are important for many animals that live in the sea and near the shore. They help keep water clean because they eat tiny particles. This makes the water clearer. Many animals, like walrus, harbour seals, sea lions, and California sea lion, eat clams. Birds such as roseate spoonbills, Eurasian oystercatcher, whooping crane, common crane, American flamingo, and common sandpiper also eat clams when they are near the water. Some octopuses, including the large Giant Pacific octopus, eat clams too.

Culinary

People all over the world enjoy eating clams. In North America, especially along the eastern coast of the United States and parts of Canada, "clam" usually means the hard clam, Mercenaria mercenaria, but also includes other edible types like the soft-shell clam and the ocean quahog. On the West Coast, people have eaten clams for thousands of years. Popular types include the butter clam, Pacific razor clam, and geoduck clam. Clams can be prepared in many ways, such as raw, steamed, boiled, baked, fried, or made into dishes like clam chowder, clam cakes, and New England clam bake.

In Asia, clams are especially enjoyed in coastal areas of India and Japan. In India, they are used in curries and fried dishes, particularly in regions like Kerala and Karnataka. In Japan, clams are common in mixed seafood dishes, hot pot, miso soup, and tsukudani. The most used varieties are Shijimi, Asari, and Hamaguri. In Europe, Great Britain and Italy both have traditional uses for clams. In Britain, the razorfish and common cockle are popular, while in Italy, clams like the vongola are often served with pasta.

Religion

In Islam, clams are considered halal in three Sunni madhhabs, but not in Hanafi. This is because only fish are allowed in Hanafi jurisprudence. In Judaism, clams are not kosher.

As currency

Some types of clams, like Mercenaria mercenaria, were used long ago by the Algonquians of Eastern North America. They made special sacred jewellery called wampum. They also made shell money from these clams.

Species

Clams are a group of bivalve mollusks, and many kinds are eaten by people. Some popular edible clams include the Ark clams, Atlantic jackknife clam, Atlantic surf clam, Geoduck, Hard clam, and Ocean quahog. Each of these clams has its own special name and home.

Other clams, like Nut clams and Duck clams, are usually not eaten. The Giant clam can also be eaten but is best avoided because it grows very slowly.