"The twilight of Tokyo's legendary fish market"

As tuna stocks continue to decline, a key Japanese fish market works to stay current.

"TOKYO -- The Tsukiji fish market is probably the rudest place in Japan.

If you've got an image in your mind of cheery fish mongers bowing and wishing you the Japanese equivalent of "top of the morning", forget it.

You get pushed and shoved, told "you're in the way!" At every step you're nearly run down by a three-wheeled electric cart careening through the tiny alleyways.

The message is clear - if you don't work here you're not really welcome."

Rupert Wingfield-Hayes reports for BBC News January 18, 2017.