A reddish “blanket”, known as the “red tide” phenomenon -- created by minute marine protozoans that are chief constituents of plankton -- has covered most of the Thermaikos Bay bordering Thessaloniki, in northern Greece.
“The specific phenomenon appears every spring and fall and lasts 3-4 weeks”, Aristotle University of Thessaloniki chemistry professor Konstantinos Fitianos told ANA-MPA. Among the negative consequences of the phenomenon is an intense foul smell.