Fishery workers catch fish at the southeastern area of the Qiandao Lake in Chun'an County, east China's Zhejiang Province, Dec. 1, 2020. (Photos: Xinhua)

Photo taken on Dec. 1, 2020 shows fish harvested from the Qiandao Lake in Chun'an County, east China's Zhejiang Province.

Fishery workers catch fish at the southeastern area of the Qiandao Lake in Chun'an County, east China's Zhejiang Province, Dec. 1, 2020.

Fishery workers catch fish at the southeastern area of the Qiandao Lake in Chun'an County, east China's Zhejiang Province, Dec. 1, 2020.

Photo taken on Dec. 1, 2020 shows fish harvested from the Qiandao Lake in Chun'an County, east China's Zhejiang Province.

A fishing vessel is at work at the southeastern area of the Qiandao Lake in Chun'an County, east China's Zhejiang Province, Dec. 1, 2020.

Aerial photo shows fishery workers catching fish at the southeastern area of the Qiandao Lake in Chun'an County, east China's Zhejiang Province, Dec. 1, 2020.

Aerial photo shows fishery workers catching fish at the southeastern area of the Qiandao Lake in Chun'an County, east China's Zhejiang Province, Dec. 1, 2020.

Photo taken on Dec. 1, 2020 shows a water quality detector in the Qiandao Lake in Chun'an County, east China's Zhejiang Province.

Photo taken on Dec. 1, 2020 shows fish harvested from the Qiandao Lake in Chun'an County, east China's Zhejiang Province.

Aerial photo shows fishery workers catching fish at the southeastern area of the Qiandao Lake in Chun'an County, east China's Zhejiang Province, Dec. 1, 2020.

Fishery workers release fish fry into the Qiandao Lake in Chun'an County, east China's Zhejiang Province, Dec. 1, 2020.