an IslandsBering Sea GOAAIBS stock and the west coast stock which ranges from southeast Alaska to California AT1 is considered a depleted stock it was affected by the Exxon Valdez oil spill and declined from 22 individuals to eight between 1989 and 2004 The GOAAIBS stock may number around 500 whales while the west coast transients number over 320 orcas with over 200 along southeast Alaska， British Columbia and Washington and over 100 orcas off California California transients do not appear to intermingle much with those further north and west coast transients may be divided into subcommunities

Offshore A third population of orcas in the northeast Pacific was discovered in 1988， when a humpback whale researcher observed them in open water As their name suggests， they travel far from shore and feed primarily on schooling fish However， because they have large， scarred and nicked dorsal fins resembling those of mammalhunting transients， it may be that they also eat mammals and sharks They have mostly been encountered off the west coast of Vancouver Island and near Haida Gwaii Offshores typically congregate in groups of 20–75， with occasional sightings of larger groups of up to 200 Little is known about their habits， but they are genetically distinct from residents and transients Offshores appear to be smaller than the others， and females are characterized by dorsal fin tips that are continuously rounded

Separate fisheating and mammaleating orca communities also exist off the coast of the Russian Far East and Hokkaido， Japan Russian orcas are commonly seen around the Kamchatka Peninsula and Commander Islands Over 2，000 individual residentlike orcas and 130 transientlike orcas have been identified off Russia At least 195 individual orcas have been cataloged in the