Zebra Mussel

Dreissena polymorpha

Description:
Zebra Mussel
Facts:

This species has rapidly colonised the UK since its introduction and has reduced the numbers of the native Swan mussel where it has become established. Due to its population density and its filter feeding it can make waters very clear. It may be impossible to eradicate although work is being carried out on selective pathogens for its control.

It grows to 35mm in length and lives in dense colonies that may comprise of hundreds of thousands of individuals.

Introduced:

1824
Origin:
Russia
Location:
In freshwater throughout the UK
Status:
Undergoing local declines in some areas.
Problems:
Comments:
Have altered the ecology of waters where they have become established also block water intakes.