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Subject: Re: non-invasive marking of small fish
From: Bill Macfarlane <[log in to unmask]>
Reply-To:Scientific forum on fish and fisheries <[log in to unmask]>
Date:Wed, 16 Aug 2000 16:08:26 +1000

text/plain (52 lines) , Bill.Macfarlane.vcf (16 lines)

Hi Charlotte,
                    Have you considered clipping the anal fin in such a way so
as to minimise any physical/visual impacts whilst providing a unique code for
each individual or pair, or is this too invasive.

R C Marelius wrote:

> I want to mark young breeding pairs of cichlids (Heros appendiculatus, F1)
> in a large tank with several others of their own kind and size.  I do not
> have tagging equipment and would hesitate to use it on such a small fish
> anyway (4 -5" SL).  Due to their aggressive nature, I cannot pull the pairs
> from the group, as all their energy would be concentrated on each other
> then, rather than dispersed harmlessly among the crowd.
> It takes them a few spawnings before their pair bond is secure enough to
> prevent them from damaging each other once they are removed to a tank of
> their own, but once they have formed a pair at all, they don't do well when
> it is broken.   I can isolate them to catch them and mark them (with any
> luck) now that they're busy preparing a nest site, but I can't keep them
> isolated.  And they look just like everybody else, of course, when they are
> all darting away from a net and trying to look like gravel.
> Is there a glue I could use to place a metal or plastic dot on their dorsal
> or caudal fin, or perhaps a dab of paint that would dry instantly on the
> moist surface of a fin?  Can something be placed on the body surface
> itself, given their excellent slime coat and the small size of their scales
> (1 to 1.5 mm exposed)?  Has anyone some suggestions.
> Charlotte Marelius
> Just a hobbyist
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Bill Macfarlane
Senior Conservation Officer
Water Resource Environmental Planning
Queensland Environmental Protection Agency
Maryborough District Office
Tel: (07) 4121 1818  Fax: (07) 4121 1650
Mail: PO Box 101, Maryborough 4650
Email: [log in to unmask]
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