Balaenoptera musculus ssp. musculus (North Pacific stock)


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Balaenoptera musculus ssp. musculus (North Pacific stock)
Parent Species:
Common Name(s):
English Blue Whale

Assessment Information [top]

Red List Category & Criteria: Lower Risk/conservation dependent ver 2.3
Year Published: 1996
Date Assessed: 1996-08-01
Needs updating
Assessor(s): Cetacean Specialist Group
Extract from Reeves et al. (2003, p. 36): "The North Pacific stock was classified as Lower Risk/Conservation Dependent, mainly because the population was estimated at about 2000 in the early 1990s and evidence suggested an increase off California."

Geographic Range [top]

Range Description: Range "..during the summer in the immediate offshore waters from the Sanriku coast of Honshu, northward and eastward along the Kurilskiye Ostrova (but not into the Sea of Okhotsk) and the southern side of the Aleutian Islands, around the Gulf of Alaska, and southeastward as far as central Baja California. They do not go north of the Aleutian Islands, except rarely in the far southeastern corner of the Bering Sea. In the winter they are found regularly from southern Honshu south to Ogasawara Gunto [=Bonin Islands], Ryukyu Retto, and Taiwan, in the western Pacific, and south at least to Nayarit, Mexico, on the eastern side; there are a few records that season in the tropical mid-ocean waters." (Rice 1998)
Canada (British Columbia); Japan; Korea, Democratic People's Republic of; Korea, Republic of; Mexico (Baja California, Baja California Sur); Russian Federation (Kuril Is.); Taiwan, Province of China; United States (Alaska, Aleutian Is., California, Washington)
FAO Marine Fishing Areas:
Pacific – eastern central; Pacific – northeast; Pacific – northwest; Pacific – western central
Range Map: Click here to open the map viewer and explore range.

Habitat and Ecology [top]

Systems: Marine

Citation: Cetacean Specialist Group 1996. Balaenoptera musculus ssp. musculus (North Pacific stock). The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 30 March 2015.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please provide us with feedback so that we can correct or extend the information provided