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Dear Mareike,
About forty years ago I worked on the die
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Dear Mareike,
About forty years ago I worked on the diet of wading birds. I quickly found that a lot of soft tissue was digested in the first hour or so. Hence I would watch the animal feeding before shooting (under licence) and then inject strong formalin down the throat as soon as I retrieved it and then dissect the guts out and storing them in formalin in the field. In this way, I was able to find considerable meiofauna including the cfuticles of oligochaetes and harpaticoid copepods in their diet which would not otherwise have been detected by the methods of that time.
Obviously there are better methods and H&S considerations now, but stopping digestion ASAP would seem to offer useful results.
Good luck
Doug Herdson
Marine Fish Information Services
94 Dunstone View
Plymstock
Plymouth. PL9 8QW
Email: [log in to unmask]
Telephone: +44(0)1752 405155
-----Original Message-----
From: Scientific forum on fish and fisheries
[mailto:[log in to unmask]] On Behalf Of Mareike Volkenandt
Sent: Tuesday, November 22, 2011 3:15 AM
To: [log in to unmask]
Subject: Herring stomach analysis
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Hello everyone!
I just started with my PhD-thesis. Between other things, I would like to
look at the stomach content of Herring from different size classes. It's the
first time, that I'm doing such an analysis. We weight the stomachs and
visually estimate level of fullness. We also want to identify prey species.
In a test run, I had difficulties recognizing any prey species or groups in
the stomach. It was only a big, brownish, digested mix of something...
Do you have any advise on a best method or way of handling?
Could you recommend me any identification keys or literature references that
were helpful for your work?
Thank you in advance.
Mareike
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Mareike Volkenandt
MARES Phd student
Marine Biodiversity Research Group
Marine & Freshwater Research Center
Galway - Mayo Institute of Technology
Dublin Rd
Galway, Ireland
Phone: +353(0)9174 2502
[log in to unmask]
About MARES: http://www.mares-eu.org/
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