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Thousands of Fish Dead in Nevada Marina Mystery
Scientists can only theorize what caused the drop in oxygen levels that caused a massive fish kill in the man-made lake.

An estimated 100,000 trout, bass and catfish have died over the past month in the Sparks Marina, Nevada. The man-made lake was created nearly 15 years ago and stocked fishery has flourished since then.

Scientists say a bitter cold snap could have caused oxygen-poor waters to rise from the old rock quarry's bottom to the surface, but they don't understand what sparked the massive die-off and they have been unable to detect any live fish in the 77-acre lake.

The former aggregate pit operated by Helms Construction Co. had been found to be contaminated in 1988 by pollutants leaking from an adjacent tank farm, but state environmental officials said all the pollution had been cleaned up.

 
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Federal Permit Required for use of Aquatic Pesticides - The EPA has approval of the courts to issue a National Pollutant Discharge Elimination System, which will require the filing of permits, along additional record-keeping and reporting requirements for point source discharges of biological and chemical pesticides that leave a residue. This included the operators that use pesticides for weed and algae control.


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