A huge marine reserve in the Pacific Ocean has led to the recovery of tuna and other migratory fish.
The Papahnaumokukea Marine National Monument is larger than California.
Scientists have found that the ban on fishing in the zone has boosted tuna stocks.
MPAs are sanctuaries for marine life.
The marine protections put in place had boosted tuna species just outside the marine reserve.
According to the research published in the journal, Science, the catch rates for all fish species had increased by 8%.
They believe that the size of the protected area and the homing behavior of some tuna species played a part in the positive effects observed.
Professor JohnLynham from the University of Hawaii at Mnoa said that the protected area was not created to protect tuna.
The fish benefit was an accident of the initial intent to protect the environment.
Papahnaumokukea protects biological and cultural resources.
The state of Hawaii and the US federal government co-manage the monument.
30% of the world's oceans will be protected by the year 2030.
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