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Brendan,
Try these two references for your questions on age validation. They
will answer many of the specifics as well as some of the pitfalls of
different validation techniques.
Campana, S.E.
2001. Accuracy, precision and quality control in age determination,
including a review of the use and abuse of age validation methods. J.
Fish Biol. 59: 197-242.
Campana, S.E.; M.C. Annand; and J.I. McMillan.
1995. Graphical and statistical methods for determining the
consistency of age determinations. Trans. Amer. Fish. Soc. 124:
131-138.
Cheers,
Chris McDonough
**Please Note New E-Mail Address**
Fisheries Biologist
Marine Resources Research Institute
South Carolina Dept. of Natural Resources
P.O. Box 12599
Charleston, SC 29422-2559
(843)953-9231 phone
(843)953-9820 fax
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-----Original Message-----
From: Scientific forum on fish and fisheries
[mailto:[log in to unmask]] On Behalf Of Brendan Galloway
Sent: Wednesday, May 11, 2005 7:01 PM
To: [log in to unmask]
Subject: age validation for length-frequency distributions
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Hi Folks,
Should scales be collected from all fish (at least 100 rainbow trout in
this case) that will be used to generate a length frequency
distribution?
For this particular stream, I am assuming that only juvenile trout are
present as adults are known to move back into the lake after spawning.
Furthermore, what proportion of the fish should be sampled for otoliths
in
order to validate the scale ages? Are there published articles dealing
with these issues? Any help would be appreciated. Thanks for your
time.
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