In Nagasaki, Japan, some highly prized fresh fish are tagged with QR Codes after landing. The video (below) shows Gon-Aji (Golden Belly Horse Mackerel) being tagged prior to sale. The QR Code resolves to a mobile site where consumers can read more information about the fish. In this case that it is wild rather than farmed and was caught in the Goto-nada sea just off the Nagasaki area coastline.
Thanks to Nagoyankee on JapanForum.com for translation help.