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Around 500 scientists from 44 countries have signed a letter urging a moratorium on ocean mining, an activity that researchers say could be adversely affect fisheries, in particular deep-sea catches like tuna. Scientists made the plea recently after an ocean-mining company and its host country, the Pacific island nation of Nauru, touched off a two-year rule with the International Seabed Authority (ISA), headquartered in Kingston, Jamaica.
