Daniel Pauly at the University of British Columbia in Canada led the study. He noted that a huge amount of some catches is thrown away.
"For example, shrimp trawlers (小虾拖捞船) retain only the shrimp and the fish that they catch – often eight to 10 times as much as the shrimp – gets thrown away."
Pauly told VOA that better estimates of the actual global catch will help ensure there will be enough fish in the future.
"...But our figures suggest that since 1996 a rapid decrease is happening. And if you project this forward you end up in a few decades having much less catch, literally no catch. So that is potentially dangerous."
Researchers also found ways of the world’s fisheries are changing. They found that fishing fleets of larger nations are catching fish in the waters of developing countries more and more.
Pauly said he was surprised by the amount of fishing done by foreign fleets in competition with local fishers.
"In West Africa, the figure that was most astonishing is the enormous role of foreign fishing – of European and Asian vessels fishing legally or illegally – and competing against local fishers. On the other hand for the U.S., Australia and some developing countries, such as the Bahamas, what was apparent is the enormous contribution of recreational fisheries, which also never get reported to the FAO."
Researchers say inaccurate data also harms the development and supervision of effective policy and management measures.
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