Those three include skipjack and yellowfin ... the North Atlantic tuna, carries very similar traits in terms of size, coloration, and swim speed. However, only about 1 percent of this northern ...

Very old mercury lurks deep in the ocean and wells up into the waters where the tuna swim, experts say ... bigeye and yellowfin, which together account for 94% of global tuna catches.

Tuna stocks in some areas remain of concern, such as bluefin tuna in western parts of the Atlantic and yellowfin in the Indian Ocean. "The take home message for the general public is that things ...