Is Zhoushan Fishing Ground in China built upstream or downstream?

Zhoushan Fishing Ground in China is built on upwelling. Upflow can not only bring the bottom seawater to the surface, but also bring a large number of nutrients to the surface of deep water, which becomes the nutrition of phytoplankton and makes phytoplankton multiply in large numbers. These phytoplankton are the main food for fish, which will attract more fish to eat and form a fishing ground.

Most of the famous fishing grounds are built in the sea areas with obvious upwelling, such as Kuril Islands fishing ground in Russia, Peru fishing ground in Peru, Newfoundland fishing ground in Canada and Zhoushan fishing ground in China.