which tend to be higher than in some other fish species. That includes other tuna varieties such as skipjack, which can contain as much as three times less mercury. That's mostly due to size, with ...

The Atlantic bluefin tuna is one of the largest ... Bluefins attain their enormous size by gorging themselves almost constantly on smaller fish, crustaceans, squid, and eels.

The real grades, in descending order, are 1, 2+, 2, and 3. Fish sellers grade tuna off its appearance when landed and ...

"It's very exciting that a fish of this size has been caught in Welsh waters. We now have some of the biggest tuna in the world swimming in our waters," he added. Mr Alsop, of Rhoose, Vale of ...