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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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Invasive Species Reintroduce Toxic Chemicals to Green Bay Food Web
- Although , polychlorinated biphenyls, also known as PCBs, have been buried in the sediments, two invasive species – the quagga mussel and round goby – can allow a group of toxic chemicals deposited more than 45 years ago to reenter the food web, passing them to predatory fish and possibly people.
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