For Asian stocks, resident groups may exist in the Yellow Sea and East China Sea, and the Sea of Japan (though these populations are critically endangered and the population off China, Korea, and Japan are either near extinction or in very small numbers). Very small increases in sightings have been confirmed off Shiretoko Peninsula, Abashiri, and Kushiro in Hokkaido, Tsushima, Sado Island, off Maiduru in the Sea of Japan since in late 2000s as whales in Sea of Okhotsk might have started recolonizing into former habitats (for coastal Sakhalin, as well). Whales possibly used to migrated into Seto Inland Sea.