Aerial photo taken on March 10, 2020 shows people unloading fish from the fishing boats at the Yazhou central fishing port in Sanya, south China's Hainan Province. More than 400 fishing boats in the port have started to work as the province's fishing industry resumed operation. (Xinhua/Guo Cheng)

Aerial photo taken on March 10, 2020 shows fishing boats mooring at the Yazhou central fishing port in Sanya, south China's Hainan Province. More than 400 fishing boats in the port have started to work as the province's fishing industry resumed operation. (Xinhua/Guo Cheng)

Fishermen unload fish at the Yazhou central fishing port in Sanya, south China's Hainan Province, March 10, 2020. More than 400 fishing boats in the port have started to work as the province's fishing industry resumed operation. (Xinhua/Guo Cheng)

People trade fish at a fish market of the Yazhou central fishing port in Sanya, south China's Hainan Province, March 10, 2020. More than 400 fishing boats in the port have started to work as the province's fishing industry resumed operation. (Xinhua/Guo Cheng)

Workers load fish at the Yazhou central fishing port in Sanya, south China's Hainan Province, March 10, 2020. More than 400 fishing boats in the port have started to work as the province's fishing industry resumed operation. (Xinhua/Guo Cheng)