Mammals
Spotted Seal
Phoca largha · also called spotted seals, larga seal
Nursing a newborn pup directly on a stable stretch of pack ice, a spotted seal times its entire breeding season around exactly this kind of ice forming reliably each year, a dependence that ties its reproductive success closely to seasonal conditions across the North Pacific.
Overview
The spotted seal, Phoca largha, is a distinctively patterned true seal native to ice-covered and coastal waters across the North Pacific and adjacent Arctic Ocean, including the Bering Sea, Sea of Okhotsk, and Yellow Sea. Its close dependence on stable pack ice for pupping, striking spotted coat pattern, and strong resemblance to the harbor seal make it one of the more ecologically specific and visually distinctive seal species found in the North Pacific.
A birth carefully timed to the ice
Rather than giving birth at any point during the year, the spotted seal has synchronised its entire reproductive cycle with the seasonal arrival of stable pack ice, a dependence that makes ice timing and extent directly consequential for the species’ reproductive success.
Status
Least Concern, widespread and stable across suitable ice-covered and coastal habitat throughout the North Pacific and adjacent Arctic Ocean, though a Yellow Sea and Bohai Sea population segment remains more vulnerable.
Spotted Seal: common questions
Why does the spotted seal need stable pack ice specifically?
This species times its breeding and pupping season closely with the seasonal formation of stable pack ice, giving birth directly on the ice rather than in the water, meaning suitable ice conditions during this specific window are especially important for successful reproduction and pup survival.
How can you tell a spotted seal from a harbor seal?
This species closely resembles the harbor seal in overall body shape and size, with the two distinguished mainly through subtle differences in skull structure and genetics rather than obvious external features, making range and specific habitat context often more useful for identification than appearance alone.
Why is the spotted seal considered more vulnerable in some regions?
A distinct population segment of this species in the Yellow Sea and Bohai Sea region is considered more vulnerable and is separately monitored due to greater exposure to human activity, coastal development, and pollution compared with populations in less disturbed parts of the North Pacific and Arctic.
Does the spotted seal eat while caring for its pup?
Like several other seal species, this species can fast for extended periods during the breeding and nursing season, relying on stored fat reserves while focused on caring for its pup rather than actively foraging during this critical early period.