Nantucket is an island 30 miles (48.3 km) south of Cape Cod, Massachusetts, in the United States. Together with the small islands of Tuckernuck and Muskeget, it constitutes the town of Nantucket, Massachusetts, and the coterminous Nantucket County, which are consolidated. Part of the town is designated the Nantucket CDP, or census designated place. The region of Surfside on Nantucket is the southernmost settlement in Massachusetts.

Nantucket is a tourist destination and summer colony. The population of the island soars from approximately 10,000 to 50,000 during the summer months, due to tourists and summer residents. According to Forbes Magazine, in 2006, Nantucket had the highest median property value of any Massachusetts zip code.

The Nantucket Historic District, comprising all of Nantucket Island, was added to the National Register of Historic Places on December 13, 1966. In doing so the National Park Service paid particular note to the settlements of Nantucket and Siasconset. The island features one of the highest concentrations of pre-Civil War structures in the United States.

Commercial fishing is the capture of fish for commercial purposes. Those who practice it must often pursue fish far into the ocean under adverse conditions. Commercial fishermen harvest almost all aquatic species, from tuna, cod and salmon to shrimp, krill, lobster, clams, squid and crab, in various fisheries for these species. Commercial fishing methods have become very efficient using large nets and sea-going processing factories. Individual fishing quotas and international treaties seek to control the species and quantities caught.

A commercial fishing enterprise may vary from one man with a small boat with hand-casting nets or a few pot traps, to a huge fleet of trawlers processing tons of fish every day.

Commercial fishing gear includes weights, nets (e.g. purse seine), seine nets (e.g. beach seine), trawls (e.g. bottom trawl), dredges, hooks and line (e.g. long line and handline), lift nets, gillnets, entangling nets and traps.

According to the Food and Agriculture Organization of the United Nations, total world capture fisheries production in 2000 was 86 million tons (FAO 2002). The top producing countries were, in order, the People's Republic of China (excluding Hong Kong and Taiwan), Peru, Japan, the United States, Chile, Indonesia, Russia, India, Thailand, Norway and Iceland. Those countries accounted for more than half of the world's production; China alone accounted for a third of the world's production. Of that production, over 90% was marine and less than 10% was inland.

A small number of species support the majority of the world’s fisheries. Some of these species are herring, cod, anchovy, tuna, flounder, mullet, squid, shrimp, salmon, crab, lobster, oyster and scallops. All except these last four provided a worldwide catch of well over a million tonnes in 1999, with herring and sardines together providing a catch of over 22 million metric tons in 1999. Many other species as well are fished in smaller numbers.