Fig. 30: Spawn from perches (Perca fluviatilis) and some freshwater polyps (hydra vulgaris). These seem to be from a different species than in the previous picture. — Nikon D200, Nikkor AF Micro 60mm, Lake Zug, Restaurant Baumgarten, 19 May 2013 — EXIF: Nikon D200; Δt=1/250 s; f=60 mm; f/22.0; ISO 200; 2013-05-19 10:43:24
