Environment in Toyama Bay where the Clionidae was discovered

In August 2017, Clionidae was confirmed in Toyama Bay. Toyama Prefecture is known for its rich natural environment, and it has Toyama Bay in the north and the Japan Alps in the south. However, in the study, the acid concentration of rain in Toyama Prefecture was the second highest in Japan, so we suspect the cycle system is disrupted. As a symbol of Toyama Prefecture, it is necessary to maintain the environment in which Clionidae can survive. Therefore, it is important to conduct research of the local community and to investigate changes in its environment, to reduce the environmental impact caused by local residents. The study was conducted by using a CTD observation system installed on a training ship owned by the National Institute of Technology, Toyama College, the salinity and seawater temperature in Toyama Bay was also measured by the institute. Based on the results, this paper propose some countermeasures.