Peculiarities and negative consequences of an anomalous algal bloom that occurred in the Sea of Marmara in the spring-summer period of 2021 were estimated based on a long time series of satellite data. It was found that the area of extensive accumulations of jelly-like aggregates of organic substances (sea slime) was 973 km~2. The most intense biogenic pollutions were found in the coastal waters off the provinces of Canakkale, Bursa, and Yalova/Kocaeli (Turkey). The set of factors that could contribute to the formation of conditions for such an anomalously intense biogenic pollution has been analyzed. It was shown that the most likely causes of its development are the increase in the temperature of the marine environment (monthly averages were 17% higher than the climatic norm) and the level of photosynthetically active radiation (the excess of the climatic norm by 27%) accompanied by atypical variability of surface wind fields in the region.
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