EA initial test results suggest Golden Algae is to blame, Prymnesium Parvum, very rare but often the cause of deaths in lakes close to the sea.
"We have now received preliminary results from our water quality and algae samples that were taken from the fishery last week. The water quality and chemistry results show nothing out of the ordinary or anything that would suggest that there has been any polluting matter introduced to the lake that could result in a fish mortality.
Analysis of the algal sample found a high algal abundance with some spiky form diatoms present and also golden algae and dinophytes. The latter two have been associated with unexplained fish kills in very low abundance. That coupled with an overall high algal abundance will most likely be causing dissolved oxygen fluctuations which can also result in fish kills occurring.
Our visual checks of the fish also suggest that the most likely cause of the mortality was the algae present in the lake at the time. As we receive final confirmation of all results we will let you know.
Kind regards,"