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Invasive Rainbow Smelt are Warmed to Death in Crystal Lake
University of Wisconsin scientists are studying how mixing the water in a lake could eliminate an invasive fish. The project is designed to eliminate invasive rainbow smelt from the small Crystal Lake in Vilas County, Wisconsin.
Rainbow smelt are highly predatory and voracious. They have really big teeth and feed on the young of other fish species. These fish only live in cold water at the bottom of the lake, which is where the mixing comes in.
Air is pumped in and out of bladders, much like giant trampolines, so it rises and falls in the water. These bladders raise and lower the depth of the lake, mixing the water and raising its temperature to where it is intolerable for the rainbow smelt.
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Armored Shore Kills Habitat
- On the banks of the Potomac River, construction cranes deliver concrete and other heavy material to workers building a large development behind a steel-and-cement wall that holds back the water. If the trend continues, numerous species in the bay will continue to decline.
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