The jōnai-shijō is where wholesalers process their fish and sell to restaurants. There's also a wholesale produce market, which is the part I visited. You'll know you've reached the jōnai ...

I can’t believe I actually filmed inside the world’s largest, most top-secret fish market!

Initially, the City of London Corporation planned to move the markets of both Billingsgate and the nearby Smithfield meat ...

Tsukiji ― the world's biggest fish market and a popular tourist attraction in an area packed with restaurants and shops ― moved in October to Toyosu, a former gas plant a bit further east.