Specimens of Say's mud crab Dyspanopeus sayi, including ovigerous females, were identified in the estuarine part of Constanţa Harbour during early September 2009. Native to the Atlantic coast of North America, until now D. sayi was introduced in Britain and in the northern Adriatic, where it became abundant and is spreading. The considered vector to the Black Sea is via shipping from the northern Adriatic (Ravenna). The crab already has a well-established population in the Romanian Black Sea and it might spread to the whole of the Black and Azov Seas and the adjacent estuaries, deltas and limans.
