Hard clam

Hard Clam also known as Mercenaria mercenaria, is a species of bivalve mollusc that can be found along the eastern shores of North America, from Prince Edward Island to the Yucatán Peninsula. It is one of many unrelated edible bivalves that in the United States are frequently referred to as clams, a category that also includes the soft-shell clam.

Description

The hard clam has many alternative common names. It is also known as the Northern quahog, round clam, or chowder clam. In fish markets, there are specialist names for different sizes of this species of clam. The smallest legally harvestable clams are called countnecks, next size up are littlenecks, then topnecks. Above that are the cherrystones, and the largest are called quahogs or chowder clams.

Habitat

The hard clam is quite variable in its habitat. It is found intertidally and subtidally and can survive significant periods of exposure. The hard clam is found in a variety of bottom types, including coarse to fine sands, firm muds, and areas with rock rubble.

Reproduction

The hard clam is a broadcast spawner, and fertilization occurs in the water column. Larvae are planktonic and are transported by the currents. The larvae undergo metamorphosis into a juvenile stage, which includes the formation of a shell and the loss of the velum. This metamorphosis usually occurs before the juvenile clam is 1 mm long.

Economic Importance

The hard clam is one of the most important commercial and recreational shellfish species in the mid-Atlantic region. In many areas, hard clam populations have been severely reduced due to overfishing, habitat loss, and pollution.

Conservation

Efforts are being made to conserve the hard clam populations. These include the establishment of marine protected areas, restrictions on harvesting, and the development of aquaculture.

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