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- [![Unio crassus / Thick shelled river mussel](/modules/4048/images/13976_thumb.jpg)](/modules/4048/images/13976_med.jpg "Unio crassus / Thick shelled river mussel")
- [![Unio crassus / Thick shelled river mussel in natural habitat](/modules/4048/images/13979_thumb.jpg)](/modules/4048/images/13979_med.jpg "Unio crassus / Thick shelled river mussel in natural habitat")
- [![Electric fishing at the river Our](/modules/4048/images/13974_thumb.jpeg)](/modules/4048/images/13974_med.jpeg "Electric fishing at the river Our")
- [![Erosion on forest roads](/modules/4048/images/13975_thumb.jpeg)](/modules/4048/images/13975_med.jpeg "Erosion on forest roads")
- [![Unio crassis larvae (ca. 0,2 mm)](/modules/4048/images/13977_thumb.jpg)](/modules/4048/images/13977_med.jpg "Unio crassis larvae (ca. 0,2 mm)")
- [![Juvenile mussels (0,5 mm)](/modules/4048/images/13978_thumb.jpg)](/modules/4048/images/13978_med.jpg "Juvenile mussels (0,5 mm)")
- [![Phoxinus phoxinus](/modules/4048/images/13980_thumb.jpg)](/modules/4048/images/13980_med.jpg "Phoxinus phoxinus")
- [![Cottus gobio](/modules/4048/images/13981_thumb.jpg)](/modules/4048/images/13981_med.jpg "Cottus gobio")
- [![River Our valley](/modules/4048/images/13982_thumb.jpg)](/modules/4048/images/13982_med.jpg "River Our valley")
- [![River Sauer](/modules/4048/images/13983_thumb.jpg)](/modules/4048/images/13983_med.jpg "River Sauer")
- [![Erosin in agricultural area](/modules/4048/images/13984_thumb.jpg)](/modules/4048/images/13984_med.jpg "Erosin in agricultural area")
- [![Erosion in the forest](/modules/4048/images/13985_thumb.jpg)](/modules/4048/images/13985_med.jpg "Erosion in the forest")
- [![Erosion on forest roads](/modules/4048/images/13986_thumb.jpg)](/modules/4048/images/13986_med.jpg "Erosion on forest roads")
- [![Erosion on forest road](/modules/4048/images/13987_thumb.jpg)](/modules/4048/images/13987_med.jpg "Erosion on forest road")
- [![Cattle trampling](/modules/4048/images/13988_thumb.jpg)](/modules/4048/images/13988_med.jpg "Cattle trampling")
- [![Overgrazing](/modules/4048/images/13989_thumb.jpg)](/modules/4048/images/13989_med.jpg "Overgrazing")
- [![Raccoon](/modules/4048/images/13990_thumb.jpg)](/modules/4048/images/13990_med.jpg "Raccoon")
- [![Erosion damage](/modules/4048/images/13991_thumb.jpg)](/modules/4048/images/13991_med.jpg "Erosion damage")
- [![Tributary](/modules/4048/images/13992_thumb.jpg)](/modules/4048/images/13992_med.jpg "Tributary")
- [![Water evacuation grid](/modules/4048/images/13993_thumb.jpg)](/modules/4048/images/13993_med.jpg "Water evacuation grid")
- [![Cattle bridge](/modules/4048/images/13994_thumb.jpg)](/modules/4048/images/13994_med.jpg "Cattle bridge")
- [![Gravel introduction](/modules/4048/images/13995_thumb.jpg)](/modules/4048/images/13995_med.jpg "Gravel introduction")
- [![Young mussel (ca. 10 mm)](/modules/4048/images/13996_thumb.jpeg)](/modules/4048/images/13996_med.jpeg "Young mussel (ca. 10 mm)")
- [![Mussel search](/modules/4048/images/13997_thumb.jpeg)](/modules/4048/images/13997_med.jpeg "Mussel search")