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Why is the Sea of Okhotsk one of the world’s most biologically productive seas?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Vertical physical map showing the seas of Japan and Okhotsk, highlighting underwater basins, trenches, and ridges, as well as the coastlines and boundaries of Russia, China, North Korea, South Korea, and Japan. Major cities, islands, and peninsulas such as Vladivostok, Tokyo, Hokkaido, Sakhalin, Kamchatka Peninsula, and the Kuril Islands are labeled. Water depths are indicated with color shading, and an inset locator map shows the region's position in East Asia.
Sea of Okhotsk

The Sea of Okhotsk is considered one of the world’s most biologically productive seas due to a combination of favorable environmental factors that support marine life.1

Its high productivity is primarily driven by the following processes:

  • Nutrient Enrichment: The sea benefits from significant river drainage, which introduces essential nutrients into the water.1
  • Water Circulation: The intense intermingling of waters, facilitated by the surrounding straits and wind patterns, helps distribute nutrients throughout the sea.1
  • Upwelling: The upwelling of deep, nutrient-laden ocean waters provides a constant supply of resources that fuel the rapid growth of marine organisms during warmer months.1

These conditions create a thriving ecosystem that supports a diverse range of flora, such as algae and seaweed, and fauna, including various fish species like salmon, herring, and pollack, as well as marine mammals.1