1. This study is mainly carried out southern sea of Korea to determine effect of antifouling agents composed of synthetic organic insecticides.
2. The experimental result shows the fact that toxic agents are selectively effective and organic chlorine and phosphate compounds are effective to Balanus, and Formate derived from dithiocarbamate is also effective to marine animal other than Balanus.
3. Simultaneously the relationship between effect of other organic insecticides and variety in composition of varnishes is also determined.