I've made a trip to Dnestrovk to see the local invasive animals. As strange as it sounds, an estuary here is home to a Chinese Mitten Crab (Eriocheir sinensis), a Giant Oriental River Prawn (Macrobrachium nipponense), and an American Harris Mud Crab (Rhithropanopeus harrisii). I've also heard reports of blue crabs showing up. Just goes to show that invasives are a threat wordwide.
The mitten crab, also known as a Shanghai hairy crab is a serious threat to native species.