Essex Rivers Hub

Information provided by the Environment Agency:

On the 7 October 2014 we reported our finding of the Quagga mussel (Dreissena rostriformis bugensis) in the Wraysbury River and Wraysbury Reservoir in Staines. Further investigations have confirmed that the Quagga mussel is also present in the Warwick East Reservoir, Warwick West Reservoir and William Girling Reservoir, all located in the Lee Valley.

The Quagga mussel is a highly invasive non-native species the arrival of which in the UK has been expected for a number of years.

Due to its filtering capacity and ability to produce dense populations, it can significantly reduce native biodiversity, and alter whole freshwater ecosystems

For more information, please follow the below link to the Non-Native Species Secretariat website to view our latest briefing note:

There is no effective control or eradication method for the Quagga mussel once it has established in a reservoir and the downstream river system. The best way to prevent the spread of the Quagga mussel is to follow the bio security measure Check, Clean, Dry. We would appreciate your support in helping us to stop the spread of the species by urging water users to implement the Check. Clean, Dry approach.

For more information on the Check, Clean, Dry approach please see the attached poster or visit:

If you would like to help us promote Check, Clean, Dry please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it. where we can arrange to send signage for you to use and help us spread the Check, Clean, Dry message.

Please also encourage water users to report any suspected sightings of the Quagga mussel by emailing This email address is being protected from spambots. You need JavaScript enabled to view it. or visiting the non-native species alert website

The Environment Agency is working with Thames Water to control the spread of the Quagga mussel. We are still carrying out investigations to identify the extent of the Quagga mussel spread.

Friday 21st November 2014.

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