Different substrates
| Other specimens of Dreissena |
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Danube River, Ruse
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Rabisha Reservoir
Photos: Lubomir Andreev
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| Live specimens and shells of native molluscs (Unio, Anodonta, Viviparus) |
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Kovachitsa Reservoir
Photo: Lubomir Andreev
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Zhrebchevo Reservoir
Photo: M. Beshkova
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Invasive molluscs (C. fluminea, S. woodiana)
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Danube River, Sandrovo
Photo: Lubomir Andreev
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Danube River, Ruse
Photo: T. Trichkova
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Vegetation
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Veleka River
Photo: T. Trichkova
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Chepintsi Reservoir
Photo: Lubomir Andreev
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Trees and branches
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Ogosta Reservoir, low water level
Photos: T. Trichkova
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Stones
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Rabisha Reservoir
Photo: Lubomir Andreev
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Durankulak Lake
Photo: T. Trichkova
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Concrete
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Kazichene Lake
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Rabisha Reservoir - water tower
Photos: T. Trichkova
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Metal surfaces
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Danube River, Ruse
Photo: D. Kozuharov
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Vacha Reservoir
Photo: S. Cheshmedjiev
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| Plastic, rubber, etc. |
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Rabisha Reservoir
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Vacha Reservoir
Photo: S. Cheshmedjiev
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