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Still Waters

Mystery surrounds death of 25,000 fish

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Mystery surrounds the death of 25,000 fish in a showpiece ornamental lake, which are thought to have died of mass suffocation.

Theories for the deaths include thunderstorms and a deadly form of algae, after environment officials found oxygen levels in the lake at Pittville Park, Cheltenham, were unusually low.

http://www.telegraph...ental-lake.html

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Sounds to me like a simple lake turnover. We have those here from time to time. Generally in the early fall. After a large thunderstorm with large amounts of rain, that rain runs off into a pond or lake. With the rain water being cooler than the lake water things turnover and oxygen gets depleted in certain areas causing fish kills. Another reason could be too much dying vegetation in the lake for one reason or another. Maybe a thunderstorm blew large amounts of debris into the water, maybe a few trees were blown down into the water. The vegetation starts dying and releasing large amounts of tanic acid. This depletes oxygen levels and kills fish.

Mike

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Something like this happened by where I live at redondo pier. Thousands of fish were found dead and floating, covering the entire pier. It was after a thunderstorm too so it was mass suffocation as the fish all swam to where the water was calmer yet got overcrowded. Guess there wasnt enough oxygen to go around

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