It’s estimated illegal fishing now accounts for the capture of one in every five fish worldwide. It’s a massive problem. But the biggest threat to fish stocks comes not from illegal activity, but from mainstream fishing industries. In particular, the large national fishing fleets that traverse our oceans. A major international study of marine species has found over 33 per cent of fish species are being over-exploited. 60 per cent are being fished to their maximum level. So, can we bring over-fishing under control, before the oceans are emptied of marine life?