These are shots of my then 1yo (now 10yo) son and I visiting in 2007. Presumably, they don't let you get this close to the tuna anymore. https://www.dropbox.com/s/vjcxk2ajokxxcbd/IMG_1307.jpg https://www.dropbox.com/s/7wctwf46bekam60/IMG_1310.JPG
You can still get this close, but not in the auction. The shops who purchased some tuna then have them sitting out in their stalls sometimes.