Comments: Initial large decline was due primarily to hunting that occurred through the mid-1930s and lack of population recovery has been attributed to illegal Soviet whaling in the 1960s (Clapham et al. 2004). Because this species is so long-lived, recovery, if it does happen, may not be observable for decades more.
Current potential threats include inbreeding depression and low population density effects (Allee effect), collisions with ships and entanglement in fishing gear, degradation of feeding habitat (e.g., through effects of pollution on zooplankton), human disturbance (e.g., ships and other underwater noisemakers) and climate change and resultant changes in food supply (see North Pacific Right Whale Recovery Team 2004).
No one has provided updates yet.