Aquaculture & Fisheries

Climate Change Increases Risk of Fisheries Conflict


Climate change is affecting the ocean environment, and the changing conditions will likely result in increased fisheries-related conflicts and create new challenges in the management of global fish stocks. (istock)

A team of fisheries scientists and marine policy experts, led by a University of Rhode Island researcher, examined how climate change is affecting the ocean environment and found that the changing conditions will likely result in increased fisheries-related conflicts and create new challenges in the management of global fish stocks.

The team’s research was recently published in the journal Marine Policy.

Elizabeth Mendenhall, URI assistant professor of marine affairs, said that ocean warming, acidification, and sea-level rise that are a direct result of climate change are causing populations of fish to shift, making fish increasingly scarce, shifting the boundaries of where nations can legally fish, and increasing the intensity of fishing pressure around the world. The result will be growing conflicts between individual fishermen, fishing communities, fishing nations, and fishery managers, according to the team’s research.

“These conflicts exist at multiple scales,” said Mendenhall, who is writing a book about geopolitics and ocean governance. “Some of it is one boat versus another, sometimes it’s one country versus another, and it can get very complicated. It isn’t just about overfishing any more. There are other drivers and other dynamics involved.”

As warming temperatures shift fish populations to different areas, for instance, the bulk of those stocks may cross the borders of a nations’ 200-mile exclusive economic zone, making it illegal for those who have fished those stocks for many years to pursue them any longer.

“We’re seeing examples of fishermen crossing borders more often now because the stocks they feel they have a right to have shifted across the border,” Mendenhall said.

Among the more challenging questions that climate change is raising for fishing nations is what happens when sea-level rise submerges an island. Does that change the nation’s maritime boundaries?

“It’s an ongoing debate about whether you keep your maritime claim even though you have no land base to manage it from,” Mendenhall said. “Or does your claim go away? There are a lot of nations that fish over long distances that are ready to exploit those areas if national boundaries no longer exist.”

The tiny Japanese atoll of Okinotorishima is one such case. Located in the southernmost archipelago of Japan, its submergence is raising questions about whether Taiwan and China may legally fish in the area claimed by Japan.

“I argue that as sea level rises, Japan’s argument gets weaker,” said Mendenhall, noting that the countries haven’t challenged the boundaries based on the island’s submergence yet. “The rules on where you can make your maritime claim are based on where the land is.

“The same problem applies to coastlines. Low-lying countries like Bangladesh and Vietnam could lose a lot of maritime territory as sea level rises. The outer edge of their claim could move closer to their coastline.”

Members of the research team made a series of recommendations based on their findings designed to improve global fishery management. They recommend greater multilateral fishery monitoring, similar to what is in place off East Africa to combat piracy, which can help deter or catch illegal fishers, thereby reducing the chance that individual fishing boats will take matters into their own hands.

“We also suggest that marine protected areas be used, but it’s critical that the area protected is one where habitats are still thriving despite climate change,” Mendenhall said. “There is concern, however, that when you protect one area, it may displace the fishers to somewhere else and make the problem worse elsewhere. We need to think about the dynamics that protected areas may cause and account for that in the site selection process.”

The researchers also recommend strengthening the global fisheries management regime by taking into account climate change and the new sources of fishery conflict. The boundaries of many fish stocks were drawn decades ago, and some parts of the open ocean aren’t managed at all because no productive fish stocks were there many years ago, yet there may be fish stocks there in the future.

Most importantly, they suggest that regional fishery management organizations work together to develop coordinated governance systems to better manage fisheries as environmental conditions change and greater conflicts arise.

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  1. This movement of fish stocks also has an impact on where to build off-shore wind farms. How do you plan for a 25 year life span of the farm?

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