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Pacific and Greenland Halibut populations

The Pacific Halibut and Greenland Halibut have not had this level of fragmentation, and their population is far larger in the United States' waters, with North Pacific Halibut and groundfish fisheries extracting the largest volume of catch out of all United States fishery areas. Sometimes the California Halibut is mistaken for a subspecies, but they are not, and are not even a true Halibut species. In the North Atlantic, observation of migration indicates that there are only two major populations of Greenland Halibut that both stretch vast distances. Those populations being the Northeast one stretching from the Kara Sea to Greenland, and the Northwest one stretching from Newfoundland to Baffin Bay. These stocks had been previously thought to be four different populations, but migration has indicated that they are only two different populations, and that fishing has not fragmented them. New research also indicates that the Greenland halibut originally came from the Pacific Ocean and spread into the Arctic Basin when the Bering Strait opened for a second time around 3 million years ago, and thus the Pacific halibut is its closest living relative.