More than half of the world’s ocean-going sharks are at risk of extinction, a new analysis concludes.

Specialists with IUCN (formerly the World Conservation Union) found that 11 species are on the high-risk list, with five more showing signs of decline.

Sharks are particularly affected by over-fishing as they reproduce slowly.

The scientists are calling for global catch limits, an end to the practice of removing fins, and measures to minimise incidental catches (bycatch).