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In recent decades, there have been some changes in the salinity, quality, and average temperature of the Black Sea water. Among other modifications, there was a significant decrease in the dolphin population on the Romanian coast. The decrease in the number of species Tursios trucantus ponticus, Delphinus delphis ponticus, and Phoococena phocoena relicata species found in this area required more detailed research to obtain information about their living conditions and migration. Located at the top of the ecologica...