Booming demand could drive tuna to extinction, researchers find

Massive global expansion of tuna fisheries also poses a threat to sharks and other species, says study

Scientists have warned that existing levels of tuna fishing are unsustainable after researchers found that global catches have increased more than 1,000% over the past 60 years.

A study in the journal Fisheries Research estimated that about 6m tonnes of tuna are now caught annually, a rate that "risks driving tuna populations to unsustainable levels and possible extinction".