Management
The populations of the rainbow smelt in areas where it has been introduced, such as the Great Lakes, have been increasing in many regions, even with efforts to control its spread. Several things are being done to manage this species. Massive fish removal by over-fishing reduced the rainbow smelt populations in some lakes by the 1980s. Some people are taking a chemical approach to this growing problem, using Rotenone. Extoxnet describes Rotenone as "a slow-acting poison which interferes with the electron-transport system in the mitochondria. It acts as both a contact and stomach poison". While this is effective, it also harms other organisms and is unpopular with the public. Cox and Kitchell state that declines in smelt numbers following natural recovery or stocking of grown predator fish have been reported from lakes ranging in size from Lake Superior and Hessen found similar results in a small pond near Lillehammer, Norway in 1983. This research shows that the reintroduction of large piscivores such as walleye can help lead to the reduction of chemicals and poison needing to be used.
Read more about this topic: Rainbow Smelt
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