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Dear All,

Can anyone tell me whether fish (and of particular interest - perch)
form a 'membrane' around their faecal matter, and if so what is the
composition of such a membrane? Or is it just mucus from the intestinal
tract? I seem to recall when I was a kid that goldfish trailed strands
of the stuff around behind them as they circled the bowl and it seemed
to be packaged!
Any help most appreciated.

**************************
Dr Jonathan Grey
Max Planck Institute of Limnology
Dept Physiological Ecology
Postfach 165
D-24302 Plön
Germany

Tel: +49 (0)4522 763 283
Fax: +49 (0)4522 763 310

www.mpil-ploen.mpg.de/
**************************

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