Seen this on the news, big fish kill in a creek:
http://www.heralddemocrat.com/hd/News/2009_08-25_news_fish-kill-Sherman
And even scarier for the local lakes, zebra muscles have been found in Lake Lavon. It is the main water source for several subburbs north of Dallas, and it is only a matter of time before it is found in all of the reservoirs around here now.
http://cbs11tv.com/local/zebra.mussels.lavon.2.1143430.html

http://texaswoodlot.blogspot.com