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Subject: Re: gut content analysis
From: Irene Zweimueller <[log in to unmask]>
Reply-To:Scientific forum on fish and fisheries <[log in to unmask]>
Date:Mon, 3 Nov 2008 17:46:46 +0100

text/plain (31 lines)


According to my experience, the point method is useful, when the fish
feed on a variety of different thing, or things, which are hard to quantify (like 
detritus or makrophytes). I used it with slides of gut contents from cyprinids 
by looking through the slide on a microscope.I estimated the amount of area 
within the slide covered by a certain food category.
It is essential to have only few food categories (2-4 categories with items 
occuring frequently and another 3-5 categories occuring less frequently in 
one slide).
You also have to be familiar with the remains, so that putting the remains 
into groups is no big mental exercise (otherwise you will forget your 
estimations while trying to figure out what is what).  

With some experience it is possibel to get reproducable results, especially 
when only one person is doing the analysis.
Between-person differences can be large and if several people have to do 
the work, it is useful to train them through analysing the same slides.

Hope, this helps!
kind regards
Dr. Irene Zweimüller       phone:  ++43 1 4277 54343
Inst. f. Ecology and       FAX:    ++43 1 4277 9542     
Nature Conservation  
Dept. Limnology    e-mail: [log in to unmask]
Althanstr. 14
A-1090 Vienna
Austria - Europe

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