Toxicity assessment assays in Greece

In this study the results of toxicity assessment assays in the area of Thes saloniki in Greece are presented. Daphnia magna tests were used for the ass essment of freshwater and wastewater and Artemia salina tests for the asses sment of seawater. There was increased toxicity in the seawater of inner Th ermaikos gulf as well as in the freshwater of Koronia lake. Measures,taken to prevent toxic shock of the activated sludge microorganisms of Thessaloni ki municipal wastewater treatment plant,are also presented in this study.