DOG walkers and members of the public are being urged to stay away from a lake after around 200 fish were found dead.
Those visiting Herrington Park in Penshaw, near Sunderland, have been warned to keep away from the lake area while an investigation is underway.
Shocking pictures sent to The Northern Echo show how masses of fish have washed up with evidence of algae in the background.
The likely cause - which has been identified as Blue Green Algae - can pose a small risk to human health, but a serious risk to animals if they drink or swim in affected water.
Councillor Claire Rowntree, Deputy Leader of Sunderland City Council, the council's Cabinet Member for environmental matters, said warning signs had been erected.
She said: "This blue-green algae poses risks to both public and animal health when it forms blooms and scums in freshwater during warmer summer months.
"We have posted up warning signs about the bloom and the public should please keep themselves and their dogs away from the lake until further notice.
The Environment Agency has said it is now investigating reports and has said the phenomenon, which occurs during periods of warm weather, is natural.
An Environment Agency spokesperson said: “The Environment agency is investigating reports of approximately 200 dead fish found at Herrington Country Park in Sunderland. Officers believe the deaths were caused by a blue-green algal bloom, which reduces oxygen levels in the water.
“The landowner, Sunderland City Council, has erected warning signs to warn people of the dangers of drinking or swimming in the water, especially to dogs.
“Blue Green Algae is a naturally occurring environmental phenomenon that becomes more likely during periods of warm, settled, dry weather.
To report any sightings of dead fish or fish in distress contact the Environment Agency's incident hotline on 0800 80 70 60.
For more information from the Environment Agency - click here
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