Environmental Impact
Many states in the US are beginning to ban certain types of waders, specifically those with porous, felt soles. These kinds of soles easily host various types of invasive species that could be carried from one water source to another. The invasive organisms and plants pose a threat to fish stocks and important fish habitats. For example, effective March 1, 2012, most counties in Missouri ban these kinds of waders while sport fishing in fresh water. And in all of Alaska, as of January 1, 2012, the same law applies.
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—Walter Bagehot (1826–1877)