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A huge marine reserve in the Pacific Ocean has led to the recovery of tuna and other migratory fish around its borders, according to a study. The Papahānaumokuākea Marine National Monument in Hawaii is almost four times the size of California. Fishing is banned inside the zone, but a spillover effect has boosted tuna stocks in nearby waters, scientists have found. Marine protected areas, or MPAs, act as sanctuaries for marine life.
