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Common Carp Damage Minnesota Waters
Researchers analyzed data from over 2,000 Minnesota lakes, covering three major ecoregions of Great Plains, Eastern Temperate Forests, and Northern Forests. They also conducted whole lake experiments in six lakes in which they established what the current carp populations were, surveyed plant cover and identified species richness both before and after removing carp.

Researchers found that when common carp were prolific, plant cover was reduced to less than 10 percent and species biodiversity was halved. By analyzing the impacts of other human-caused stressors, the researchers revealed that carp had a greater impact on aquatic plant biodiversity than human watershed development did (urban and agriculture).

The study also showed that removing common carp increased plant cover, species richness and water clarity.



 
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Common Aquatic Bacteria Responsible for Fish Kill - Test results from fish sampling suggest the recent Spofford Lake fish kill resulted from the presence of a common aquatic bacteria combined with a time of year when fish were stressed from spawning activity and war water temperatures. Test results showed that no virus was present in the fish tested and that the bacteria found was Aeromonas Hydrophila. According to Fish Health Center Staff, this bacteria only becomes lethal to fish when there is another stressor to the fish. In some cases, the bacteria can infect a single fish and then multiply rapidly, causing a substantial fish kill.


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