Hi Christian,
    I do not know if you try this method, I saw it in one of the FAO
Publications about fish marking. The method is very simple you just cut a
piece of adipose fine or other other fin. You will easily differentiate the
marked fishes because the new growing part of the fin mostly grown in
different color and you can easily detect the trace of cutting.

Best regards

Hasan Orek.

Middle East Technical Univ.
Inst.of Marine Sciences Dept.: marine Biology and Fisheries
Erdemli/ Icel Turkey


Christian Holm wrote:

> Hello everybody,
>
> Maybe someone has gained some experience in this and can help me out:
>
> How can I mark tiny salmon fry (around 30-40 mm long or even smaller)
> for a flume experiment?
>
> I observe a small number (1-6) of these small fish by eye from the side
> at ranges up to 1 metre and sometimes reduced visibility by water
> coloration. Experiments last around a week and the fish are wild caught.
>
> The marking should permit me to identify the individual during my
> observations. (and ideally there are no side-effects for the health and
> behaviour of the fish...)
>
> excuse cross-posting
>
> and thanks a lot in advance for all suggestions, hints and links!
>
> please reply directly to me:
>
> *       Christian Holm
> *
> *       Dept. of Environmental Science
> *       Stirling University
> *       Stirling
> *       FK9 4 LA
> *       Scotland
> *       Tel: 44/1786-46 6544
> *       Fax:""""""""""""" 7843
> *       e-mail: [log in to unmask]
>
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