The capture of the blue crab (Callinectes sapidus, Decapoda, Crustacea) in the Russian sector of the Black Sea.

The case of alien blue crab (Callinectes sapidus Rathbum, 1896) capture in the Russian sector of the Black Sea is described. All known cases of detection of this species in the Black Sea and Sea of Azov are listed. The degree, probability, and possible consequences of blue crab naturalization in the Azov-Black Sea basin are analyzed.