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http://www.webcom.com/~hurleyj/fish.html

http://www.wh.whoi.edu/homepage/faq.html

http://www.actwin.com/WWWVL-Fish.html

http://http2.sils.umich.edu/~dtorres/cats/cats.html

http://netvet.wustl.edu/cats.htm

http://www.amark.com/amark/