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Home > Fish and Wildlife Service News >
Iowa Department of Natural Resources
Fish Kill On The Iowa River Probably Due To Natural CausesIowa Department of Natural Resources — 8/8/2006Following a report of dead fish and a call about the water color, the DNR checked the stream on Tuesday. "We found predominately larger dead fish," said Jeff Vansteenburg, supervisor of the Mason City DNR field office. "The daytime dissolved oxygen level in the stream is high and the ammonia level is low," he added. "However, our investigators found an extensive algal bloom near the dam where the dead fish were found." The city has had recent high rains and hot temperatures, the ideal conditions to produce algae. The brown color and scum that people have seen are also consistent with a brown-pigmented algae. "People think they are seeing something really awful," he said. "But with high temperatures algae that were located on the bottom often float to the surface, giving an unappealing appearance to the water." As the algae decompose, there is sometimes a sag in dissolved oxygen levels, commonly occurring at night. At dawn, the local wastewater operator will do oxygen tests and the DNR fisheries biologists will return to confirm nighttime oxygen sags as the cause of the fish kill. "Given the time of year and river conditions, it's certainly likely that algae decomposition is the cause," said Vansteenburg.
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