7 Oct 2019 - 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”.
“Tuna fisheries have expanded into every region that we can possibly exploit. There are no new fishing grounds to explore and we are catching fish at the highest rate we can,” said Angie Coulter, a researcher with the Sea Around Us initiative at the University of British Columbia.
The global study is the first to estimate the volume of tuna taken out of the ocean, where the fish are being caught and the amount of bycatch – tuna caught unintentionally and discarded into the sea.