Big eye tuna

They found that mercury concentrations in yellowfin tuna increased about 5.5 percent per year between 1998 and 2008.

Levels in bigeye tuna increased about 3.9 percent per year from 2002 to 2008. Mercury concentrations tended to be greater in bigeye tuna than in yellowfin tuna.
 
The work was reported in a study scheduled for online publication March 6 in the journal Environmental Toxicology and Chemistry.

Of particular concern are the movements of the heavily fished big eye tuna species which made up 75 percent of the 2,135 fish tagged during the 36 day expedition.

A Very little tagging of big eye tuna has been carried out in the Western Pacific in the past.

The expedition covered parts of the Exclusive Economic Zones of the Marshall Islands, Federated States of Micronesia, Nauru, Solomon Islands and Tuvalu.