 The study found that the concentration of heavy metals in the Pearl River estuary was within acceptable limits except for mercury in German water. However, some aquatic organisms such as corofium sp, sparis or rata and temera stylyphora were highly susceptible to copper and zinc pollution. The study also found that the concentration of heavy metals in the Pearl River estuary was lower than the national standard for grade 2 water quality. This article was authored by Geo-A-Tang, Sinyu Liu, Xiao Junyou, and others.