I came across this article on cnn.com. A report was released that contends that our earliest ancestors overfished the ocean to such an extent that their relatively small population upset the ecology of the ocean.
http://www.cnn.com/2001/TECH/science/07/26/ancient.fishing/index.html

[ 07-26-2001: Message edited by: RPetzold ]
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Ryan S. Petzold
aka
'Sparkey' and/or 'Special'