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No-Catch Zone 4-Times Bigger Than California Has Led to Increased Tuna Catch in Hawai’i’s Fisheries



Fishing boats off Hawai’i – SWNS

No-fishing zones are successfully restoring tuna while at the same time boosting the fishing industry, according to new research.

It’s well-known no-fishing zones can help sedentary marine life such as coral or lobster, and now scientists at University of Hawai’i at Mānoa have shown for the first time that they are also helping migrating fish travelling long distances.

Previously it was assumed no marine protected area (MPA) could be large enough to protect species that travel long distances, such as tuna.

But Papahānaumokuākea Marine National Monument is almost four times the size of California, and the world’s largest no-fishing zone.

Scientists aboard fishing boats nearby but outside the area observed 54% more yellowfin tuna were caught, 12% more bigeye tuna and the catch rate for all other species increased by 8%.

There are huge economic benefits to the zones too—globally the tuna fishing industry generates nearly $40 billion a year and supports millions of jobs across the world.

RELATED: After Decades of Federal Protection, Hawaiian Coral Reefs Are Returning to Their Former Glory

Writing in the journal Nature, the team put the positive results down to tuna actually being homebodies, mostly living their lives in the same place.

“Over the past 30 years, we have learned that tunas do not venture as far away from home as we once thought,” said Professor Jennifer Raynor at the Univ. of Wisconsin and co-author of the paper. “The Hawai’ian Islands are a nursery for baby yellowfin tuna, and it turns out that many of these fish stay in the region.”

The zones have a cultural impact too because yellowfin tuna and bigeye tuna, otherwise known as ‘ahi, have historically been central to Hawai’i’s culture and diet.

“Being born and raised in Hawaii, I know how important ʻahi is to the community here,” co-author Sarah Medoff, at the Univ. of Hawai’i Mānoa. “It’s not just something eaten in fancy sushi restaurants, it’s the focal point of family gatherings, weddings, birthdays, graduation ceremonies and New Year’s Eve parties.”

READ MORE: Hawaii’s State Bird Soars Back From Brink of Extinction After Only 30 Birds Left on Islands

“It’s reassuring to know that the monument is protecting this resource for my own children and for future generations.”

Papahānaumokuākea was not created to generate benefits to the local tuna fishery when it was created in 2006 and expanded in 2016—it was always intended to protect biological and cultural resources.

The area is sacred to Native Hawai’ians who co-manage the monument alongside the state of Hawai’i and the federal government.

Professor Kekuewa Kikiloi from the Kamakakūokalani Center for Hawaiian Studies at the University of Hawaii at Mānoa, who was not involved in the study, said the research demonstrates just how important the protected areas in the Pacific are.

“This research by Medoff et al. reaffirms the value of large scale marine protected areas in the Pacific,” he noted. “The protections that were fought for by Native Hawai’ians and other stakeholders for Papahānaumokuākea serve to benefit everyone, including fishing interests.”

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