View of marine ranch in Sanya

Photo taken on May 28, 2020 shows fishes and sea anemone at a marine ranch in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua/Yang Guanyu)

Fishes forage around the artificial reefs at a marine ranch in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province, March 28, 2020. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua/Yang Guanyu)

Photo taken on April 28, 2020 shows corals at a marine ranch in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua/Yang Guanyu)

Photo taken on April 29, 2020 shows corals at a marine ranch in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua/Yang Guanyu)

A staff member dives in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province, April 27, 2020. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua/Yang Guanyu)

Corals are seen on a rope in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province, Jan. 12, 2020. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua/Yang Guanyu)

Staff members lay fish shelters in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province, Jan. 21, 2016. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua)

Fishes forage around artificial reefs at a marine ranch in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province, March 28, 2020. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua/Yang Guanyu)

Photo taken on Jan. 21, 2016 shows an artificial reef in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua)

Photo taken on April 29, 2020 shows the corals at a marine ranch in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua/Yang Guanyu)

A staff member patrols at a marine ranch in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province, March 28, 2020. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua/Yang Guanyu)

Fishes forage around artificial reefs at the marine ranch in the sea area of Wuzhizhou Island in Sanya, south China's Hainan Province, March 28, 2020. The marine ranch in the sea area of Wuzhizhou Island in Sanya is China's first tropical marine ranch. In recent years, the marine ranch has successively carried out artificial reef laying, marine environment restoration and coral transplantation, gradually promoting the protection and restoration of the marine ecosystem. By the end of 2019, a total of 1,526 artificial fishing reefs of various types, 21 ship reefs and a batch of volcanic rock reefs have been laid in the marine ranch off Wuzhizhou Island. (Xinhua/Yang Guanyu)