Beginning on September 1st, a new rule takes effect in Texas limiting catch of alligator gar to one per day per angler.  No limit existed before the change.
 http://www.brownsvilleherald.com/news/world-100336-protection-alligator.html

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Freshwater fish at the top of the food chain may evolve more slowly than fishes at lower trophic levels:
 http://www.sciencedaily.com/releases/2009/07/090728125824.htm

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