Eubalaena japonica 

Scope: Global
Language: English

Translate page into:

Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Cetartiodactyla Balaenidae

Scientific Name: Eubalaena japonica (Lacépède, 1818)
Infra-specific Taxa Assessed:
Common Name(s):
English North Pacific Right Whale
Eubalaena glacialis P.L.S. Müller, 1776
Taxonomic Notes: The taxonomy follows the view of the International Whaling Commission (IWC) Scientific Committee (IWC 2004) and the Convention on Migratory Species, which now recognize right whales in the North Atlantic, North Pacific and southern hemisphere as three distinct species in the genus Eubalaena, namely E. glacialis (North Atlantic Right Whale), E. japonica (North Pacific Right Whale) and E. australis (Southern Right Whale), based mainly on the mtDNA phylogenetic analyses of Rosenbaum et al. (2000).

In most of the scientific literature prior to 2000, including previous Red Lists (e.g. Baillie and Groombridge 1996), all northern hemisphere right whales are treated as the single species E. glacialis.

Rice (1998) classified right whales in the North Atlantic, North Pacific and southern hemisphere as the single species Balaena glacialis, in the genus Balaena along with B. mysticetus, the Bowhead Whale. While not all cetologists accept that the three right whale taxa qualify as full biological species, their clear geographical separation ensures that no practical problem arises from treating them as separate species.

Assessment Information [top]

Red List Category & Criteria: Endangered D ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Reilly, S.B., Bannister, J.L., Best, P.B., Brown, M., Brownell Jr., R.L., Butterworth, D.S., Clapham, P.J., Cooke, J., Donovan, G.P., Urbán, J. & Zerbini, A.N.
Reviewer(s): Taylor, B.L. & Notarbartolo di Sciara, G. (Cetacean Red List Authority)
In view of how little is known about this species, and in the absence of evidence of a recovering trend, it is appropriate, pending analysis of more recent data, to base the assessment on the lower end of the range of the available abundance estimates, which are ~400 for the Okhotsk Sea and ~100 for the rest of the North Pacific, which implies a total of ~500, of which approximately half (~250) may be mature. It is therefore listed as Endangered under criterion D. Accumulation of new data over the next few years may lead to improved population estimates and a re-evaluation of the listing. A separate assessment has been developed for the eastern North Pacific subpopulation.
Previously published Red List assessments:

Geographic Range [top]

Range Description:In the North Pacific, right whales occur during the summer in the Sea of Okhotsk, the southeastern Bering Sea, the Aleutian Islands, and the northern Gulf of Alaska. During the winter, they occur (or at least occurred historically) southward to the Sea of Japan [=East Sea], Taiwan Strait and the Ogasawara Gunto (Bonin Islands, Japan) in the west and to Baja California Sur (Mexico) in the east. Populations on the Asian and American sides of the Pacific are regarded as discrete (Brownell et al. 2001). Vagrants have been recorded in the Hawaiian islands (Rowntree et al. 1980, Herman et al. 1980).

Formerly abundant across much of the North Pacific in summer, mainly north of 40°N, the right whale is now regularly seen only in the Okhotsk Sea and the southeastern Bering Sea, with occasional sightings along the east coast of Japan, off the Bonin Islands, and in the Gulf of Alaska. In the 1970s there were two sightings off Hawaii (Salden and Mickelson 1999) in spring and three right whales were taken in the Yellow Sea in winter (Wang 1978, 1988). Sightings off California and Mexico are rare and there is no evidence that the western coasts of the United States and Mexico were ever highly frequented habitat for this species (Brownell et al. 2001).
Countries occurrence:
Japan; Russian Federation; United States (Alaska, California - Vagrant, Hawaiian Is. - Vagrant, Oregon - Vagrant, Washington - Vagrant)
Canada (British Columbia); China; Korea, Democratic People's Republic of; Korea, Republic of; Mexico (Baja California, Baja California Sur); Taiwan, Province of China
FAO Marine Fishing Areas:
Pacific – eastern central; Pacific – northwest; Pacific – northeast
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The right whale population in the North Pacific is only a small fraction of what it was prior to 19th century whaling. A preliminary estimate of 26,500-37,000 animals taken (including struck and lost) during the period 1839-1909 was given by Scarff (2001), of which 21,000-30,000 were taken during 1840-49 alone.

Since the start of modern whaling in the North Pacific (1911), 742 right whales are recorded taken (Brownell et al. 2001) of which about 500 were illegal catches by Soviet whaling fleets in the 1960s, that were concealed at the time (Doroshenko 2000).

Brownell et al. (2001) listed a total of 1,965 right whale sighting records in the 20th century. Today, the main remnant population summers in the Sea of Okhotsk between Sakhalin Island and Kamchatka (Russian Federation). Based on sightings of 28 right whales in 2,688 nautical miles of Japanese-Russian cetacean surveys in the Okhotsk Sea in August and September in 1989, 1990 and 1992, Miyashita and Kato (1998) derived a preliminary population estimate of 922 whales (95% CI 404-2,108) using line-transect analysis. Additional Japanese surveys were conducted in 1999, 2000 and 2003 (Miyashita et al. 2000, 2001; Miyashita 2004). These yielded sightings of 23 right whales in 6,966 nautical miles of survey, but the data have not yet been analyzed to provide a population estimate. Given the low precision of the estimate from 1989-92, and the fact that the more recent surveys encountered relatively fewer right whales (3.3 whales per 1,000 miles in 1999-2003 compared with 10.4 whales per 1,000 miles in 1989-92), a new population estimate should be derived, using data from all the surveys to date. Sightings off Japan at other times of year may be whales migrating to or from the Okhotsk Sea.

In the eastern North Pacific, the few animals observed are usually alone and in scattered locations. The only exception is an area of the south-eastern Bering Sea where small groups of right whales have been seen in several successive years (LeDuc et al. 2001, Wade et al. 2006). No quantitative estimates of abundance outside the Okhotsk Sea are available, but the paucity of sightings suggests that right whales in the eastern North Pacific number only in the tens (Brownell et al. 2001). No confirmed sightings of calves were made in this region in the 20th century, and there have been only three thus far in the 21st (Waite et al. 2003, Wade et al. 2006).
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Little is known about habitat use by North Pacific right whales. The rarity of coastal records in winter in either historical or recent times suggest that their breeding grounds may have been offshore (Clapham et al. 2004). This is in contrast to southern right whales which form inshore breeding concentrations. There is clearly some migration northward in summer and southward in winter (Clapham et al. 2004), but the location of the wintering grounds is unknown. The historical catches show that in summer the species mainly occurred in the Bering Sea, Gulf of Alaska, Sea of Okhotsk and northern North Pacific.

Use and Trade [top]

Use and Trade: This species is no longer harvested. It was once the target of major commercial whaling.

Threats [top]

Major Threat(s): Hunting by the Japanese began as early as the late 1500s, and by Europeans and Americans in the 1830s; by 1900, the population had been reduced to a tiny fraction of its original abundance. Although legally protected by the IWC since 1946 (and by earlier agreements since 1935) illegal hunting continued into the 1960s, when Soviet whaling fleets killed 372 right whales in the eastern North Pacific, which may have been the bulk of the remaining population there (Doroshenko 2000, Brownell et al. 2001). The eastern North Pacific population is distinct and of extremely small size (fewer than 50 mature individuals); it is the subject of a separate assessment, as CR.

There is currently no direct hunting but there have been cases of known and suspected entanglements (Burdin et al. 2004) in the Okhotsk Sea and Kuril Islands, involving at least four whales including one dead. Effort is needed to ascertain the frequency of such occurrences, since the very low observer effort probably means that most deaths pass unrecorded.

As compared with the intensively studied North Atlantic right whale, the more offshore and remote distribution of the North Pacific right whale may be an advantage in terms of less intensive exposure to human impacts, but the disadvantage is that impacts that do occur are less likely to be detected and their consequences are harder to ascertain and evaluate.

Conservation Actions [top]

Conservation Actions: North Pacific right whales have been legally protected from commercial whaling since 1935 by the IWC, but this has been fully respected in practice only since the 1970s.

The species is in Appendix I of both CITES and CMS.

Classifications [top]

9. Marine Neritic -> 9.1. Marine Neritic - Pelagic
suitability:Suitable  major importance:Yes
10. Marine Oceanic -> 10.1. Marine Oceanic - Epipelagic (0-200m)
suitability:Suitable  major importance:Yes
3. Species management -> 3.2. Species recovery

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
In-Place Education
  Included in international legislation:Yes
  Subject to any international management/trade controls:Yes
4. Transportation & service corridors -> 4.3. Shipping lanes
♦ timing:Ongoing ♦ scope:Minority (<50%) ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

5. Biological resource use -> 5.4. Fishing & harvesting aquatic resources -> 5.4.2. Intentional use: (large scale) [harvest]
♦ timing:Past, Unlikely to Return ♦ scope:Whole (>90%) ♦ severity:Very Rapid Declines ⇒ Impact score:Past Impact 
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

5. Biological resource use -> 5.4. Fishing & harvesting aquatic resources -> 5.4.3. Unintentional effects: (subsistence/small scale) [harvest]
♦ timing:Ongoing ♦ scope:Unknown ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
1. Research -> 1.5. Threats
1. Research -> 1.6. Actions
3. Monitoring -> 3.1. Population trends

Bibliography [top]

Baillie, J. and Groombridge, B. (comps and eds). 1996. 1996 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland and Cambridge, UK.

Brownell Jr., R. L., Clapham, P. J., Miyashita, T. and Kasuya, T. 2001. Conservation status of North Pacific right whales. Journal of Cetacean Research and Management Special Issue 2: 269-286.

Burdin, A. M., Nikulin, S., Jacobs Soauding, M. and Brownell Jr., R. L. 2004. Incidental entanglement of Okhotsk Sea right whales: a future conservation issue? International Whaling Commission Scientific Committee.

Clapham, P. J., Good, C., Quinn, S. E., Reeves, R. R., Scarff, R. R. and Brownell Jr., R. L. 2004. Distribution of North Pacific right whales (Eubalaena japonica) as shown by 19th and 20th century whaling catch and sighting records. Journal of Cetacean Research and Management 6(1): 1-6.

Doroshenko, N. V. 2000. Soviet Whaling for blue, gray, bowhead and right whales in the North Pacific Ocean, 1961-1979. Soviet Whaling Data (1949-1979), pp. 96-103. Center for Russian Environmental Policy, Moscow, Russia.

Herman, L. M., Baker, C. S., Forestell, P. H. and Antinoja, R. C. 1980. Right whale Balaena glacialis sightings near Hawaii: a clue to the wintering grounds? Marine Ecology Progress Series 2: 271-275.

International Whaling Commission. 2004. Classification of the order Cetacea. Journal of Cetcaean Research and Management 6(1): xi-xii.

Leduc, R. G., Perryman, W. L., Gilpatrick, J. W., Hyde, J., Stinchcomb, C., Carretta, J. V. and Brownell Jr., R. L. 2001. A note on recent surveys for right whales in the southeastern Bering Sea. Journal of Cetacean Research and Management 2: 287-289.

Miyahsita, T. 2004. Cruise report of the common minke whale sighting surveys in the Sea of Okhotsk in 2003. International Whaling Commission Scientific Committee, Sorrento, Italy.

Miyashita T. and Kato H. 1998. Recent data on the status of right whales in the NW Pacific Ocean. IWC Scientific Committee doc. SC/M98/RW11.

Miyashita, T., Nishiwaki, S., Vladimirov, V. A. and Doroshenko, N. V. 2001. Cruise report on the minke whale sighting surveys in the Sea of Okhotsk, 2000. International Whaling Commission Scientific Committee, London, UK.

Miyashita, T., Okamura, H., Vladimirov, V. A. and Doroshenko, N. V. 2000. Cruise report of the Japan-Russia joint sighting survey in the Sea of Okhotsk in 1999. International Whaling Commission Scientific Committee, Adelaide, Australia.

Rice, D.W. 1998. Marine Mammals of the World: Systematics and Distribution. Society for Marine Mammalogy, Lawrence, Kansas.

Rosenbaum, H. C., Brownell Jr., R. L., Brown, M. W., Scaeff, S. C., Portway, V., White, B. N., Malik, S. and Pastene, L. A. 2000. World-wide genetic differentiation of Eubalaena: Questioning the number of right whale species. Molecular Ecology 9: 1793-1802.

Rowntree, V., Darling, J., Silber, G. and Ferrari, M. 1980. Rare sighting of a right whale (Eubalaena glacialis) in Hawaii. Canadian Journal of Zoology 58: 309-312.

Salden, D. R. and Mickelsen, J. 1999. Rare sighting of a North Pacific right whale (Eubalaena glacialis) in Hawai'i. Pacific Science 53: 341-345.

Scarff, J. E. 2001. Preliminary estimates of whaling-induced mortality in the 10th century North Pacific right whale (Eubalaena janonicus) fishery, adjusting for struck-but-lost whale and non-American whaling. Journal of Cetacean Research and Management 2: 261-268.

Wade, P. R., Heide-Jorgensen, M. P., Shelden, K. E. W., Barlow, J., Carretta, J., Durban, J. W., Leduc, R. G., Munger, L., Rankin, S., Sauter, A. and Stinchcomb, C. 2006. Acoustic detection and satellite-tracking leads to discovery or rare concentration of endangered North Pacific right whales. Biology Letters.

Waite, J. M., Wynne, K. and Mellinger, D. K. 2003. Documented sightings of a North Pacific right whale in the Gulf of Alaska and post-sighting acoustic monitoring. Northwestern Naturalist 84: 38-43.

Wang, P. 1978. Studies on the baleen whales in the Yellow Sea. Acta Zoologica Sinica 24: 269-277.

Wang, P. 1988. Cetacea. In: Z. Xiao (ed.), Fauna Liaoningica, pp. P. 342. Liaoning Science and Technology Press, Shenyang, China.

Citation: Reilly, S.B., Bannister, J.L., Best, P.B., Brown, M., Brownell Jr., R.L., Butterworth, D.S., Clapham, P.J., Cooke, J., Donovan, G.P., Urbán, J. & Zerbini, A.N. 2008. Eubalaena japonica. In: . The IUCN Red List of Threatened Species 2008: e.T41711A10540463. . Downloaded on 21 June 2018.
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