mAg released from normal operation of the Daya Bay nuclear power plant had been assessed the critical radionuclide to the environment. Availability monitoring and assessment of environmental impacts depend upon comprehension of the environmental behaviors. The 110mAg contents in various environmental media involving seawater, sediment, and some marine organisms are measured in the West Daya Bay. Some environmental behaviors of 110mAg in the bay are discussed primarily. The result of screening biological indicator shows that the bivalvia and gastropod are probably appropriate objective for 110mAg environmental monitoring in the Bay. Sargassum is also available indicator in spring.