Japan tuna is world's most expensive edible fish

A bluefin tuna has been sold for three quarters of a million dollars in Tokyo - a price almost double last year's record sale.

The bluefin tuna, prized for making the finest sushi, fetched 56.49m yen ($736,000, £472,125) at Tsukiji fish market's first auction of the year.

The winning bidder was Kiyoshi Kimura, owner of a sushi restaurant chain.

Japan is the world's biggest consumer of seafood, eating about 80% of the Atlantic and Pacific bluefins caught.

However, restrictions on catches have been tightened in recent years because of concerns about overfishing.