The Environment Agency has been called out to Diss Mere today to tackle a major oxygen level drop which is threatening its fish stocks.
The agency received a call this morning after members of the public reported seeing fish in distress. Some reports said the fish were gasping for air.
A spokesman for the Environment Agency said: “Within an hour our team had arrived on site and monitoring showed that the problems were due to low dissolved oxygen levels.
“In response we deployed aerators, and the water quickly showed signs of improvement. We will keep them in place overnight and will reassess the situation in the morning.”
Diss Town Council is responsible for the Mere, and its clerk, Deborah Sarson, said that unfortunately one or two fish had already been pulled from the water dead.
She said the problem was the blue green algae outbreak on the Mere. Because of low light levels recently, all the algae has suddenly died and caused a huge drop in dissolved oxygen levels.
Mr Sarson said: “We responded immediately to the situation. We are working with the Environment Agency to try to avoid any further loss of fish.”
The Environment Agency has recorded just five per cent oxygen levels. The spokesman said in any situation they would seek to act if the levels dropped to below 40 per cent.
Agency staff have not seen any dead fish themselves.
Many fish died about ten years ago, when Diss Mere suffered a huge oxygen level drop.