An unidentified man walks on the 2-mile loop trail surrounding the Sparks Marina, where all of the fish have died over the past month _ an estimated total of 100,000 trout, bass and catfish _ on Friday, Jan. 17, 2014, in Sparks, Nev. Scientists say a sudden cold spurt in December likely caused a violent ``turnover'' of the 77-acre, man-made lake's waters that sucked out almost all the oxygen and killed the fish. (AP Photo/Scott Sonner).
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