ABSTRACT
Water used for vessel ballasting dumped in the port of loading appears to be dangerous for coastal ecosystems. Alien species introductions caused by ballast waters exchange may result in excessive development of the organisms in the new environment and become risk to the local fauna and flora as well as they limit the diversity of living organisms in the coastal basins and river estuaries susceptible for alien species introductions (Doblin and other 2001). In the paper the risk assessment of port waters and coastal ecosystems pollution due to ballast waters dumped into the ĝwinoujĞcie harbour has been undertaken.
