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Around the world, there is a growing scientific consensus that our oceans are in crisis. Decades of destructive fishing practices and mismanagement have taken their toll on many of our fisheries. Three-quarters of all commercially valuable fish stocks are now exploited, overexploited or depleted. Worldwide, up to 90% of stocks of large predatory fish such as halibut, sharks, tuna and swordfish already have been fished away. According to a new study published this month in the journal Science, 96% of the world’s oceans have been damaged by human activity. Researchers predict that global fisheries could collapse by the middle of this century.