People have been warned to beware after the discovery of potentially harmful algae in Yeadon Tarn.
The presence of the blue-green algae species Anabaena has been confirmed by the Environment Agency.
The tiny organ-isms are capable of producing toxic neurotoxins, which can harm anyone coming into contact with them.
The discovery has prompted the Parks and Countryside Department of Leeds City Council to put up notices around the Tarn warning the public of the danger and advising them to keep away from the water.
Groups using the Tarn have been told to ensure members know the procedures to follow to safe-guard their health.
People can become exposed to the neurotoxins by swal-lowing contamin-ated water, or by absorbing them through their skin. The toxins can also be swallowed by eating contaminated fish. A health alert was issued at the Tarn two years ago when traces of blue-green algae were found there.
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