What is more, marine biologists recently warned that our seafood is in terminal decline. According to research published in Science last November, stocks of all the fish and shellfish that we currently eat will collapse before 2050. Or at least that’s how the media reported it.

B   However the scientist who led the study has said that the main conclusion of his research has been buried beneath the headlines. While the danger to our seafood supply is real enough, says Boris Worm, assistant professor of marine conservation biology at Dalhousie University, Canada, there is a more serious point: that the way in which we manage the oceans is not only threatening the survival of individual species, it’s upsetting the delicate balance of marine communities and thus causing the collapse of entire ecosystems. Research has shown that the number of ecosystems where all higher forms of life are extinct, so-called dead zones is increasing.

The point that many reports failed to highlight, says Worm, is that we have to revolutionise the way our marine resources are run, changing the focus from stocks and quotas to biodiversity and ecosystem protection. And to do that, we must change the way the debate about our marine resources is conducted in the public domain.

C   Around 7,500 years ago, shrinking glaciers and the resulting higher water levels led to the development of what’s called the Wadden Sea, a 13,500-square-kilometre area of the North Sea. During the first 5,000 years or so, the sea pulsated with life. There was a high level of biodiversity on the seabed too, and the salt marshes and mud flats on the coast supported millions of birds. This continued until around 2,000 years ago, when human pressure began to affect it. Research has shown that some of the larger creatures disappeared more than 500 years ago