The return of mass spawning of herring that paints the winter sea water white -- a phenomenon not seen for half a century. A mysterious vortex created by the resurging population of Okhotsk atka mackerel in the spring. The seafloor covered with countless scallops in early summer, a gathering the size of which is rarely seen anywhere else in the world. The latest technology in underwater filming captures nature's spectacles in the oceans of Hokkaido, the fruits of decades of fisheries management efforts by the local fishing community.
