From June 1st to June 3rd, 2021, we participated in the 29th Symposium on Environmental Chemistry held at Senri Life Science Center, Toyonaka City, Osaka Prefecture.

This symposium on environmental chemistry was held by a hybrid method (presentation at the venue and online) because a state of emergency was announced due to the effects of the new coronavirus.

We made an online presentation entitled "Combined Effects of Organotin Alternative Antifouling Biocides (Sea-Nine 211, Diuron, Irgarol 1051) on Sea Urchins". It was shown that the presence of multiple organotin alternative antifouling biocides is more toxic to sea urchins than when used separately.

We will continue to conduct surveys and research on the environment and make presentations.