The Manchester Museum’s specimen of the male Chinese Mitten Crab (Eriocheir sinensis), collected from Ribble Estuary, Lancashire, in 2007.
The Chinese Mitten Crab (Eriocheir sinensis) is an accidentally imported species in the North Sea, which is considered one of the World’s 100 worst invasive species. The crab first appeared in northern Germany in 1912. It was unintentionally brought from China, apparently as a stowaway in the ballast tanks of cargo ships. Since 1912, the crab has dramatically spread over northern Europe. It was first recorded from Thames River in 1935. Now it is also established in the Rivers Humber, Medway, Tyne, Wharfe and Ouse, increasing its range throughout England and Wales by several tens of kilometres a year. See here about Mitten Crab recording project in the UK.
This crab lives both in fresh and salt waters. In autumn, adult crabs undertake a mass migration from freshwaters…
View original post 169 more words