The report brings together the tuna stock records from each of the major Regional Fisheries Management Organizations, serving as a single resource for comprehensive information.<\/p>\n
The report uses a colour rating system to grade three areas \u2013 stock abundance, fishing mortality and environment.<\/p>\n
Notable changes in rating include an improvement in biomass rating from orange to green for Eastern Pacific bigeye tuna.<\/p>\n
However, Atlantic Ocean bigeye tuna had a negative biomass rating change from green to orange, and a similarly negative change in fishing mortality from yellow to orange.<\/p>\n
In accordance with ISSF guidelines, purse seine on tuna-dolphin associations changed from green to yellow. In the absence of data more recent than 2006, status of these populations in the eastern Pacific Ocean are uncertain.<\/p>\n
Despite improvements in multiple fisheries, there is continued evidence that several stocks, notably Pacific Bluefin tuna, Atlantic Ocean bigeye and Western and Central Pacific bigeye continue to be overfished.<\/p>\n
Globally 52% of stocks are at a healthy level of abundance, 35% are overfished and 13% are at an intermediate level. In terms of exploitation 52% of the stocks are experiencing a low fishing mortality rate and 13% need stronger management to end overfishing.<\/p>\n
In terms of total catch, 87% comes from healthy stocks, owing to the fact that skipjack stocks contribute more than one half of the global catch and they are all in a healthy situation.<\/p>\n