Yawancin wannan ya kasance a cikin Antarctic, wanda ya ragu zuwa mutane 360 ko kusan 0.15% na lambobin su na asali; sauran al'ummomin ba su da mummunan lalacewa. Yawan mutanen Blue Whale na Antarctic yana girma a cikin saurin sauri na kimanin 7.3% a kowace shekara, amma an farautar shi zuwa irin wannan ƙananan matakin da ya kasance a wani ɓangare na lambobin pre-whaling. Yawan mutanen duniya har yanzu yana buƙatar kariya, amma ba a cikin haɗarin haɗari ba. Tun lokacin da aka gabatar da haramtacciyar whale, nazarin ya bincika ko yawan mutanen Blue Whale na duniya yana ƙaruwa ko kuma yana da karko. A cikin Antarctic, mafi kyawun ƙididdiga ya nuna karuwar 7.3% a kowace shekara tun bayan ƙarshen harbe-harbe, amma ya kasance a ƙarƙashin 1% na yawan adadin su na asali.
arewa maso yammacin Pacific tsakanin Kamchatka da arewacin Japan