Michel Roggo / Watermilfoil (Myriophyllum spicatum) with some stems supporting clusters of Zebra mussel (Dreissena polymorpha) Lake Neuchatel, Switzerland. Highly commended in the Plants category of the Wildlife Pho...

Alex Mustard / 2020VISION / Colony of Zebra mussels (Dreissena polymorpha) in flooded quarry, a non-native, invasive species, Stoney Cove, Stoney Stratford, Leicestershire, UK, December

Robert Thompson / Zebra Mussels {Dreissena polymorpha} Lower Lough Erne, County Fermanagh, Northern Ireland, UK

Robert Thompson / Zebra Mussels {Dreissena polymorpha} Lower Lough Erne, County Fermanagh, Northern Ireland, UK

Willem Kolvoort / Moss animals (Cristatella mucedo), Zebra mussel (Dreissena polymorpha) and Ramshorn snail (Planorbidae), all on submerged branch, peat bog lake, Holland

Willem Kolvoort / Underwater mass of Zebra mussels (Dreissena polymorpha) in sand winning pit, Holland

Willem Kolvoort / A big Zebra mussel (Dreissena polymorpha) with a lot of young mussels around it, maybe offspring, sand winning pit, Holland

Willem Kolvoort / Underwater branches covered in Zebra mussels (Dreissena polymorpha) sand winning pit, Holland

Willem Kolvoort / Swan mussel (Anodonta cygnaea) with Zebra mussel (Dreissena polymorpha) attached to left side, sand winning pit, Holland

Willem Kolvoort / Zebra mussels (Dreissena polymorpha) feeding in a canal, Zwolle, Holland

Willem Kolvoort / Zebra mussels {Dreissena polymorpha} attached to aquatic plants, Lough Keye, Republic of Ireland

Willem Kolvoort / Zebra mussels {Dreissena polymorpha} one adult and several young filter feeding, Holland.