The sea is a big place. Most fish are small. So it stands to reason that it is difficult to work out with any degree of accuracy just how many fish live in the sea. One way is to measure how many fish we pull out of it. But is that the best way? Or even an accurate way? In two Comment pieces this week, starting on page 303, fisheries scientists debate the issue. It is a crucial one. Worldwide, more than US$200 billion offish were caught or farmed in 2010.
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