The Last Century of Wild Seafood

by Richard Black, BBC

Factory Trawler

There will be virtually nothing left to fish from the seas by the middle of the century if current trends continue, according to a major scientific study. Stocks have collapsed in nearly one-third of sea fisheries, and the rate of decline is accelerating. Writing in the journal Science, the international team of researchers says fishery decline is closely tied to a broader loss of marine biodiversity. But a greater use of protected areas could safeguard existing stocks.

"The way we use the oceans is that we hope and assume there will always be another species to exploit after we've completely gone through the last one," said research leader Boris Worm, from Dalhousie University in Canada.

“This century is the last century of wild seafood. What we're highlighting is there is a finite number of stocks; we have gone through one-third, and we are going to get through the rest," said Steve Palumbi, from Stanford University in California, one of the other scientists on the project. He added: "Unless we fundamentally change the way we manage all the ocean species together, as working ecosystems, then this century is the last century of wild seafood."

This is a vast piece of research, incorporating scientists from many institutions in Europe and the Americas, and drawing on four distinctly different kinds of data. Catch records from the open sea give a picture of declining fish stocks.

In 2003, 29% of open sea fisheries were in a state of collapse, defined as a decline to less than 10% of their original yield. Bigger vessels, better nets, and new technology for spotting fish are not bringing the world's fleets bigger returns - in fact, the global catch fell by 13% between 1994 and 2003.

Historical records from coastal zones in North America, Europe and Australia also show declining yields, in step with declining species diversity; these are yields not just of fish, but of other kinds of seafood too.

Zones of biodiversity loss also tended to see more beach closures, more blooms of potentially harmful algae, and more coastal flooding.

Experiments performed in small, relatively contained ecosystems show that reductions in diversity tend to bring reductions in the size and robustness of local fish stocks. This implies that loss of biodiversity is driving the declines in fish stocks seen in the large-scale studies.

The final part of the jigsaw is data from areas where fishing has been banned or heavily restricted. These show that protection brings back biodiversity within the zone, and restores populations of fish just outside.

"The image I use to explain why biodiversity is so important is that marine life is a bit like a house of cards," said Dr Worm. "All parts of it are integral to the structure; if you remove parts, particularly at the bottom, it's detrimental to everything on top and threatens the whole structure. "

And we're learning that in the oceans, species are very strongly linked to each other - probably more so than on land."

What the study does not do is attribute damage to individual activities such as over-fishing, pollution or habitat loss; instead it paints a picture of the cumulative harm done across the board. Even so, a key implication of the research is that more of the oceans should be protected.

But the extent of protection is not the only issue, according to Carl Gustaf Lundin, head of the global marine programme at IUCN, the World Conservation Union. "The benefits of marine-protected areas are quite clear in a few cases; there's no doubt that protecting areas leads to a lot more fish and larger fish, and less vulnerability," he said. "But you also have to have good management of marine parks and good management of fisheries. Clearly, fishing should not wreck the ecosystem, bottom trawling being a good example of something which does wreck the ecosystem." But, he said, the concept of protecting fish stocks by protecting biodiversity does make sense. "This is a good compelling case; we should protect biodiversity, and it does pay off even in simple monetary terms through fisheries yield."

Protecting stocks demands the political will to act on scientific advice - something which Boris Worm finds lacking in Europe, where politicians have ignored recommendations to halt the iconic North Sea cod fishery year after year. Without a ban, scientists fear the North Sea stocks could follow the Grand Banks cod of eastern Canada into apparently terminal decline. "I'm just amazed, it's very irrational," he said. "You have scientific consensus and nothing moves. It's a sad example; and what happened in Canada should be such a warning, because now it's collapsed it's not coming back."

"So long, you've run out of all the fish."

Bioneers Conference, October 16-19, 2009, San Rafael, California, October 16-18

“Bioneers” is an odd name. It was coined by Kenny Ausubel, who along with Nina Simons founded the non-profit organization and its annual conference in 1990. The word derives from its founders’ belief that humans can work with and through nature to make our world a better place. Bioneers’ “founding perspectives" are:

Natural Medicine. Nature has a profound and profoundly mysterious ability for self-repair. The primary source of healing lies in nature. In environmental restoration as in medicine, the role of the practitioner is to support nature to heal itself. This principle became foundational to Bioneers.

Nature’s Solutions. Nature has solved all the ecological challenges we’re trying to address. Practitioners such as John Todd, Amory Lovins, Wes Jackson and Donald Hammer, as well as traditional indigenous practices, were a primary inspiration. In 1997, naturalist and author Janine Benyus gave this emerging science a name in her landmark book Biomimicry: Innovation Inspired by Nature, the same year she first spoke at Bioneers. Biomimicry has been a core focus since Bioneers’ inception.

Biocultural Diversity. In nature, diversity is the very fabric of life. Because change is the only constant in nature, diversity is the source of resilience to adapt to change in both natural and human systems. Successful adaptation requires keeping open the greatest range of biologically and culturally diverse options. Diversity is also the sacred tree of life, with intrinsic value.

The Bioneers Conference is a leading-edge forum of social and scientific innovators focused on solutions inspired by nature and human ingenuity where you may:

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