The main feeding habitat of this subpopulation is the shallow (5-15 m depth) shelf of northeastern SakhalinIsland, particularly off the southern portion of Piltun Lagoon, where the main prey species appear to be amphipods and isopods (Weller et al., 1999). In some years the whales have also used an offshore feeding ground in 30-35m depth southeast of ChayvoBay where benthic amphipods and cumaceans are the main prey species (Fadeev 2003). Some gray whales have also been seen off western Kamchatka but to date all whales photographed there are also known from the Piltun area (Reeves et al. 2005). Recently whales have also been seen, apparently feeding, in SevernayaBay on the north coast of Sakhalin (IUCN 2006).