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Aquatic invasive species, those not native to the region, have caused "biological pollution" to Lake Michigan and the other Great Lakes since the 1800s. Subsequent to European settlement, well over 100 exotic aquatic organisms have become established in the Great Lakes.
As human activity has increased, the rate of introduction has increased. More than one-third of these aquatic invasive species were introduced in the past 30 years, a major increase coinciding with the opening of the St. Lawrence Seaway. Many aquatic invasive species pose an economic or ecological threat to Lake Michigan and other waters of Indiana and neighboring states.
The Department of Natural Resources maintains a website, which provides a comprehensive review of invasive species. You may also find information regarding aquatic invasives species at the following links:
If you think you have seen an aquatic invasive species and want to report it, click here.