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Joaquin,
If you get stuck on that, you might try downloading some software
that I developed some time ago and remains available at no cost from
my web site (http://www4.ncsu.edu/~tkwak). While Pop/Pro software
was developed to estimate fish production rates and variances
(instantaneous growth rate or increment summation methods), it
includes modules to estimate fish populations (density and biomass,
size stratified, including variance and confidence intervals) using a
single-census, mark-recapture method or a multiple-pass removal
method (maximum-likelihood), like the one to which you refer below.
There are Mac and DOS versions of Pop/Pro available, and all the
estimation algorithms and references are given in the associated
documentation. Furthermore, you know where to contact me now, if you
have a question on its use. Hope this helps.
Regards,
Tom Kwak
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>Fish Folks-
>
> I've started using the DOS-based MicroFish 3.0 (1989) program to estimate
>fish numbers based on multiple pass electrofishing. In addition to the
>population estimate, the program also creates upper and lower confidence
>intervals. However, neither the program nor the manual give any specific
>information about which confidence intervals are given (i.e, 90%, 95%, 99%,
>or some other %). I have not been able to track down the program's
>authors, John S. Van Deventer and William S. Platts, to ask them directly.
>
> I'd appreciate it greatly if you had any information regarding which
>confidence intervals the program uses, contact information for the authors,
>and/or information on more current MicroFish versions or other free
>software that does the same thing.
>
> Please reply to me directly at: [log in to unmask]
>
> Thanks in advance.
>
> - Joaquin Feliciano
--
--
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Tom Kwak ([log in to unmask])
NC Cooperative Research Unit
Box 7617, NC State University
Raleigh, NC 27695-7617, USA
919/513-2696
http://www4.ncsu.edu/~tkwak
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