Trawling the seabed for fish is an environmental disaster; it wrecks ecosystems, destroys fish stocks and leaves behind a marine desert. But there is growing evidence that the effect is sometimes very different, with trawling increasing fish stocks from the North Sea to the California coast. A new modelling study may for the first time have demonstrated why.

Trawlers attach large nets to a metal beam dragged across the seabed to catch bottom-dwelling fish. Greenpeace likens it to "driving a huge bulldozer through a forest", leaving a flat, featureless desert on the seabed.

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