BEIJING -- China's research vessel Kexue03 has completed an investigation of late enteromorpha green tide and returned to Qingdao, East China's Shandong province, according to China Ocean News on Wednesday.

The vessel departed Qingdao on July 19, with the mission of conducting investigation and research such as quantitative distribution, sedimentation and ecological effect on the late period of the green tide.

A total of 20 crew members took part in the investigation covering 33 hydrology, biology and chemistry stations, said the newspaper.

They analyzed the influence of enteromorpha green tide on marine ecological environment and provided data support for the observation, alarm, prevention and control of the enteromorpha green tide.