The reason why Zhoushan Fishing Ground in Zhejiang Province has become the largest fishing ground in China lies in: ① it is located on the coastal continental shelf, with abundant sunshine and strong photosynthesis; ② Yangtze River, Qiantang River and other big rivers bring rich nutrients; ③ Converging of cold and warm air currents along the coast; ④ Located in the subtropical zone, the water temperature is suitable.