Hello Robert - I have used MIX software from Ichthus Data Systems in Canada to fit fish length frequency data to Von Bertallanfy growth curves. This program is available for IBM's and clones (and I believe UNIX boxes) as well as Macintosh (which I use). I'm not sure if anyone has ever used it for turtle data. The authors (Peter McDonald is one that I remember off hand) offer to help people use the program, for free.
Since I am at home now, I don't have the complete reference and address available. I could get it to you on the 7th of Jan. when I return to work if you still need it.
Good luck,
--Craig Lilyestrom Marine Resources Division P.R. DNER, San Juan, Puerto Rico
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