The Salton Sea has been in decline for years. Large scale fish die offs have become annual summer events since the late nineties. The major causes are believed to be the ever increasing salinity pollution from Mexico via the New River and agricultural runoff from the surrounding farmland on the southern end of the Sea. The pollutants include huge quantities of raw sewage industrial waste farm fertilizers and pesticides.
As an example of the scale of past fish die offs, it was estimated that 7.6 million fish died during a single-day event on August 12 1999.
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