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I would also like to see an authoritative answer to this. For salmon I have heard some people say that the faeces are pellets that fall according to Stoke's Law, while others have observed the faecal matter coming out in the form of mucosoid strings. It makes a big difference if you are trying to figure out where the faeces reach the bottom.
It may depend on the fish feed too. In any case, it would be nice to see whether there is any kind of consensus about this.
Bill Silvert
Dr Jonathan Grey wrote:
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!
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