Abstract
Population of the spotted seal Phoca largha in Peter the Great Bay of the Sea of Japan is in a state of unstable equilibrium, ensuring the maintenance of population number at extremely low level of 2.5 thousand individuals. The current status of the largha seal population and its biocenotic significance in the bay are considered, and threat to seal stable existence under increasing anthropogenic pressure are analyzed. Because of the eco-ethological features (coastal breeding, specific social organization) and strongly pronounced isolation of reproductive grouping of the spotted seals in Peter the Great Bay, probability of recovery after a possible reduction in population numbers due to immigration is negligible, and the resumption by the internal potential may be impossible.
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