Hello Felicia,

For this type of analysis with shrimp, one normally
uses individual total and carapace length in
millimetres and, individual weight in grams.  I still
haven’t read similar publications related with
seashells but I’m sure there are at least a few. Any
way I suspect that the essential data you will need is
the total height and width (e.g. for a Cypraea).
Knowing which individuals are mature or immature is
relevant but not essential. If you measure a large
quantity of individuals that represent all sizes of
the existing stock, FISAT will give you more details
on the parameters you are seeking for. What you must
find out thought is the longevity for the specie or
species you are working with, for comparison. If now
works exist, consider yours as a first contribute;
sure more will come out after woods :-).

I suggest you contact CSIRO Marine Laboratories. PO
Box 120. Cleveland. 4163. Australia. They have some
pretty good publications with microcomputer programs,
like FISAT, for local shrimp stocks. They might also
have some publications related with shellfish; it’s
worth trying for.

Also try to acquire, Sparre, P. & Venema, S. C.,
(1998) – Introduction to tropical fish stock
assessment. FAO FISHERIES TECHNICAL PAPER 306/1. Part
1: Manual, Rev.2. FAO. Rome, 407 p. This publication
might also help you out with these and other dough’s
for your work.

Wish you the best of luck with your work and hope you
find good results so that one day you can tell us all
about them, her on the list.
The best of regards,
Carlos Afonso from South Portugal






--- Felicia Zahida <[log in to unmask]> wrote:
> Dear All,
>
> I do interest to do some stock analysis on shells,
> since there is a tendency to harvest shells as much
> as
> possible in our beaches areas.
>
> My surfing resulting in the availability of stock
> analysis program called FISAT 2000 (FAO-ICLARM Stock
> Analaysis Tools) released by FAO and ICLARM. This
> program originally designed to fishes and lobsters.
>
> Please respond me immediatelly if you do have an
> experience in this case of study. My question is
> what
> shells character(s) should I use to determine
> whether
> my shells is mature or young ? Is the aperture width
> ?
> or what ? Shells width? shells lengths?
>
> Thank you for your kind response in advance.
>
> Felicia Zahida
> Faculty of Biology
> Atma Jaya Yogyakarta University
> Jl. Babarsari 44
> Yogyakarta 55281 Indonesia
> [log in to unmask]
> [log in to unmask]
>
>
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