A new book by Professor Dr. Bayram Öztürk highlights the issue of alien species in the Turkish seas, with over 900 foreign species in the Mediterranean. Most of these species enter via the Suez Canal and through ship ballast water. The increase in water temperature due to climate change facilitates the spread of these alien species, causing bio-security and biodiversity issues. Öztürk stresses the need for monitoring and regulation of ship ballast waters to prevent the introduction of harmful species. The book also emphasizes the importance of protecting native species and discussing the potential impacts of alien species on fisheries, health, tourism, and socio-economic health.