New
study maps how ocean currents connect the world's fisheries
University of Delaware
A new study published in the journal Science finds that the world's marine fisheries form a single network, with over $10 billion worth of fish each year being caught in a country other than the one in which it spawned.
While fisheries are
traditionally managed at the national level, the study reveals the degree to
which each country's fishing economy relies on the health of its neighbors'
spawning grounds, highlighting the need for greater international cooperation.
Led by researchers at the University of California, Berkeley, the London School of Economics, and the University of Delaware, the study used a particle tracking computer simulation to map the flow of fish larvae across national boundaries.
It is the first to estimate the extent of larval transport globally, putting fishery management in a new perspective by identifying hotspots of regional interdependence where cooperative management is needed most.
"Now we have a
map of how the world's fisheries are interconnected, and where international
cooperation is needed most urgently to conserve a natural resource that
hundreds of millions of people rely on," said co-author Kimberly Oremus,
assistant professor at the University of Delaware's School of Marine Science
and Policy.
The vast majority of
the world's wild-caught marine fish, an estimated 90%, are caught within 200
miles of shore, within national jurisdictions. Yet even these fish can be carried
far from their spawning grounds by currents in their larval stage, before
they're able to swim.
This means that while countries have set national maritime boundaries, the ocean is made up of highly interconnected networks where most countries depend on their neighbors to properly manage their own fisheries.
Understanding the nature of this network is an important step toward more effective fishery management, and is essential for countries whose economies and food security are reliant on fish born elsewhere.
This means that while countries have set national maritime boundaries, the ocean is made up of highly interconnected networks where most countries depend on their neighbors to properly manage their own fisheries.
Understanding the nature of this network is an important step toward more effective fishery management, and is essential for countries whose economies and food security are reliant on fish born elsewhere.
The authors brought
together their expertise in oceanography, fish biology, and economics to make
progress on this complex problem.
"Data from a wide
range of scientific fields needed to come together to make this study
possible," said lead author Nandini Ramesh, a post-doctoral researcher in
the Department of Earth and Planetary Science at the University of California,
Berkeley.
"We needed to look at patterns of fish spawning, the life cycles of different species, ocean currents, and how these vary with the seasons in order to begin to understand this system."
The study combined data from satellites, ocean moorings, ecological field observations, and marine catch records, to build a computer model of how eggs and larvae of over 700 species of fish all over the world are transported by ocean currents.
"We needed to look at patterns of fish spawning, the life cycles of different species, ocean currents, and how these vary with the seasons in order to begin to understand this system."
The study combined data from satellites, ocean moorings, ecological field observations, and marine catch records, to build a computer model of how eggs and larvae of over 700 species of fish all over the world are transported by ocean currents.
The research shows that ocean regions are connected to each other in what's known as a "small world network," the same phenomenon that allows strangers to be linked by six degrees of separation. That adds a potential new risk: threats in one part of the world could result in a cascade of stresses, affecting one region after another.
"We are all
dependent on the oceans," said co-author James Rising, assistant
professorial research fellow at the Grantham Research Institute in the London
School of Economics. "When fisheries are mismanaged or breeding grounds
are not protected, it could affect food security half a world away."
A surprising finding of the study was how interconnected national fisheries are, across the globe.
"This is something of a double-edged sword," explained lead author Ramesh, "On one hand, it implies that mismanagement of a fishery can have negative effects that easily propagate to other countries; on the other hand, it implies that multiple countries can benefit by targeting conservation and/or management efforts in just a few regions."
"By modeling
dispersal by species, we could connect this ecosystem service to the value of
catch, marine fishing jobs, food security and gross domestic product,"
Oremus added.
"This allowed us to talk about how vulnerable a nation is to the management of fisheries in neighboring countries."
"This allowed us to talk about how vulnerable a nation is to the management of fisheries in neighboring countries."
They found that the
tropics are especially vulnerable to this larval movement -- particularly when
it comes to food security and jobs.
"Our hope is that
this study will be a stepping stone for policy makers to study their own
regions more closely to determine their interdependencies," said Ramesh.
"This is an important first step. This is not something people have
examined before at this scale."