A study of Maryland brook trout indicates that the disappearance of the native fish might be due to urbanization.
Researchers led by Maryland Department of Natural Resources biologist Scott A. Stranko found that brook trout have disappeared from some Baltimore County watersheds where impervious surfaces such as pavement and rooftops cover less than 4 percent of the ground.
That's much lower than the 10 percent figure generally accepted as environmentally sound for nearly 30 years.
The short answer? Don't pave the brook trout streams. Link to the article via the Charlotte Examiner
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