Fig. 68: Immigrated Zebra mussels (Dreissena polymorpha) on the ground. They came from the black sea and spread here in all lakes. — Nikon D200, Nikkor AF Micro 60mm, 2 x Sea&Sea YS-110α, Hergiswil, Lopper, Lake Lucerne, 29 July 2012 — EXIF: Nikon D200; Δt=1/250 s; f=60 mm; f/16.0; ISO 200; 2012-07-29 9:52:49
