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Rare Sea Slug Signals Hainan's Ocean Revival
9 Jun
Summary
- A rare leaf sheep sea slug sighting indicates improving marine ecology.
- Coral coverage in Sanya Bay increased from 23% to 41% since 2011.
- Marine robots and drones planted 32,000 coral colonies in Sanya Bay.

New signs of marine recovery have emerged off Hainan province, coinciding with the 18th United Nations World Oceans Day and China's 19th National Ocean Awareness Day. A rare leaf sheep sea slug was recently spotted, indicating improvements in water quality and a more stable reef system.
Sanya has been a leader in marine ecological restoration since 2011 with its tropical marine ranch project. This initiative has involved deploying over 80,000 cubic meters of artificial reefs and transplanting more than 50,000 coral seedlings.
These efforts have led to a notable increase in coral coverage, rising from 23 percent to 41 percent in six years, with survival rates exceeding 80 percent. Additionally, advanced methods like drones and underwater robots have been employed to plant 32,000 coral colonies in Sanya Bay.
Nearshore waters in Sanya have consistently maintained excellent water quality. Beach cleanups, involving over 100 volunteers, and expanding marine education programs in schools further demonstrate a commitment to conservation and raising awareness among youth.