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According to recent tests, two large fish kills below Ozark Dam on the Arkansas River were likely caused by increases in atmospheric oxygen and nitrogen in the water after spillway gates were opened.
About 83,000 freshwater drum and 800 yellow bass died Dec. 29 after 10 spillway gates were open for 10 hours. About 500 drum died Jan. 28 shortly after seven gates were open for two hours.
Bob Limbird, an AGFC district fisheries supervisor; Frank Leone, an AGFC fisheries management biologist; Kelly Winningham, an AGFC fish pathologist, and Andy Goodwin of the University of Arkansas at Pine Blu