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Blue green algae found at Llyn Cefni Reservoir and Llyn Coron

The Isle of Anglesey County Council has been informed by Environment Agency Wales that blue-green algae has been discovered at both Llyn Cefni Reservoir Llangefni and Llyn Coron, Bodorgan.

The Agency has asked the site owners Dwr Cymru Welsh Water and Bodorgan Estates, respectively, for water based activities to be restricted. It is recommended that activities where immersion in the water is likely should be restricted as a temporary measure.

Environment Agency Wales will continue to monitor the situation and review the sample results obtained. However, if the level of blue-green algae in these water bodies increases, there is a possibility that it may have to be closed until the algae subsides.

The build up of blue-green algae at Llyn Cefni Reservoir, Llangefni and Llyn Coron, Bodorgan is a natural occurrence which occurs from time to time during warm conditions.

The blue-green algae (cyanobacteria), in this case Gleotrichia,, occurs naturally in inland waters, estuaries and seas and cannot be removed or treated. The algae produce toxins which can cause skin rashes, nausea, vomiting, stomach pains, fever and headache if swallowed. Occasionally it can cause more serious illness such as liver and brain damage. Children are at greater risk than adults of developing problems because of their comparative lower body weight.

Visitors to these water bodies are advised to take the following precautions:

  • not to swim in the water
  • not to swallow the water
  • to avoid contact with the algae
  • not to eat fish caught in the water
  • not to allow pets or livestock to come into contact with the water
  • to observe and abide by notices positioned around the lakes

If you have any health concerns, please contact your GP or NHS Direct Wales on 0845 4647.

To report any further signs of blue green algae call Environment Agency Wales’ 24 hour hotline on 0800 807060.

ENDS 1.8.11

For further information: Gethin Jones, Press Office (01248) 752130

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Last update: 2 August 2011 Give feedback on this page
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