The collapse of the groundfish stocks led to severe socioeconomic effects for those in the region who depended heavily on fisheries for their livelihood. Both effects, in fact, may have complemented each other heavy fishing pressure may have caused fish stocks to become more susceptible to environmental shifts. Coincidentally, the water temperature on the Grand Banks was abnormally low during the late 1980s and early ’90s, leading to the hypothesis that environmental conditions-and not overexploitation-led to the depleted state of the groundfish. In the early 1990s the "spawning stock biomass" of cod-i.e., the amount of fish (measured by weight) at reproductive age-was only 5 to 10 percent of the level of the early 1960s. The groundfish stocks of the Grand Banks and Labrador, particularly those of northern Atlantic cod, have been depleted primarily as a result of overfishing.
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How solid is your knowledge of all things geological? Test your knowledge by taking this quiz. The term geology refers, according to Britannica, the fields of study concerned with the solid Earth. Also in the later 1970s, the first of numerous deposits of petroleum and natural gas were discovered in the Grand Banks. Agreements between Canada and other countries accustomed to fishing within Canada’s newly extended coastal fisheries jurisdiction were concluded and limited the catch of foreign countries to certain more abundant species that were beyond Canada’s capacity to harvest. In 1977 Canada extended its seaward fishing claim to encompass all areas within 200 nautical miles (370 km) of its shores, including most of the Grand Banks. The extensive use of the area by trawler fleets from many nations in the mid-20th century created several international incidents, led to overfishing, and necessitated regulating the size of net mesh used so that the small fish could escape, thus safeguarding against depletion. The Grand Banks were first officially reported in 1498 by John Cabot, the Italian explorer leading an English-sponsored expedition.Īmong the most plentiful species of fish are cod, haddock, various flatfish, herring, and mackerel. The mingling of the cold and warm water, on the other hand, produces favourable conditions for the growth of plankton, on which fish depend directly or indirectly for their food supply. Occasional icebergs and severe storms also add to the hazards of the area. Air masses passing over these contrasting water bodies often produce heavy fogs. The cold Labrador Current and the relatively warm Gulf Stream meet in the vicinity of the Grand Banks. Depths average 180 feet (55 metres), but many places reach 600 feet (180 metres).
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Pierre and they are sometimes considered to include the submarine plateaus that extend southwestward to Georges Bank, east-southeast of Cape Cod, Mass., U.S. They consist of a number of separate banks, chief of which are Grand, Green, and St. Noted as an international fishing ground, the banks extend for 350 miles (560 km) north to south and for 420 miles (675 km) east to west. Grand Banks, portion of the North American continental shelf in the Atlantic Ocean, lying southeast of Newfoundland island, Canada.
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