Salmon and shad were once abundant in the rivers of Connecticut, and a variety of other fish and shellfish were once taken from the coastal waters. The annual fish catch declined after the late 19th century, partly because of the increasing water pollution of the rivers and coastal waters. Since the early 1970s Connecticut has successfully followed a program that improved both coastal water quality and shellfish production. Water quality management, habitat improvement, and the seeding of shellfish has revived the industry, and large amounts of coastal waters are leased to private shellfish farmers. The eastern oyster and the hard-shell clam have been the focus of the program, although soft-shell clams and bay oysters have also benefited. The principal fish caught in Connecticut are bluefish and striped bass. Lobster and oysters are the leading shellfish.
Lumbering now plays only a minor role in the state’s economy. During the 18th and 19th centuries, lumber was cut for use in Connecticut’s shipbuilding industry and was also the major fuel used in buildings, lime kilns, and brass mills. Hardwood trees, principally white oak, American basswood, and hop hornbeam, provide most of the cut lumber.
Connecticut has only a few known mineral deposits of commercial worth. Copper and lead were mined in colonial times and used in making household utensils. Iron was also mined, and during the American Revolution, Connecticut supplied iron for the manufacture of weapons, ammunition, and other military equipment for the colonial forces. However, nonmetals now account for all of the state’s mineral production. Traprock, which is used in road-building, and sand and gravel are the state’s most valuable minerals. "Connecticut" © Emmanuel BUCHOT, Encarta, Wikipedia
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