From the Ichthypundit

ABCNEWS.com : Fish Return to Kentucky Streams

Two years ago, aquatic life in the streams was wiped out by a "deluge" of coal sludge. But they've been recolonized from unaffected streams and are recovering more quickly than expected.

(I'd like to point out that the Bush Administration thinks coal sludge is just dandy. I know it's not relevant, but I just like to point it out.)