Zebra mussels © Bernd Nies
Zebra mussels: Zebra mussels (Dreissena polymorpha) on the sea ground. These mussels came from the Black Sea and spread out here like a pest and replace the endemic mussels. They stick on every solid ground even crabs and other mussels. — Nikon D200, Nikkor AF Micro 60mm, 2 x Sea&Sea YS-110α, Hergiswil, Lopper, Lake Lucerne, 29 July 2012. Nikon D200, 1/250 s, F/18.0, 60 mm, ISO 200, Sunday, July 29, 2012 09:39:28