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Hai,
I am a fish researcher from India (tropical country). I worked on Indian Freshwater fishes. In tropics, we also followed the Point method by Hynes. In tropical fishes, pharyngeal teeths are present for surface feeders, bottom dwellers and grazers too. Here Point method is widely used to analyse the gut contents. Not only cyprinids, other families also have the same characters. By the gut content analysis and field observation the niches are segregated.
But I am unsure, how far my point of view fit to temperate fishes. If you are interested, I am ready to share few more points/references in this aspect.
Dr. Sankaranarayanan
--- On Thu, 10/23/08, [log in to unmask] <[log in to unmask]> wrote:
> From: [log in to unmask] <[log in to unmask]>
> Subject: Re: gut content analysis
> To: [log in to unmask]
> Date: Thursday, October 23, 2008, 5:56 PM
> Hello, to you Stefano and everybody else on the list:
>
> I failed to get feedback on your request regardin cyprinds
> trophic determinations, but since we have a similar
> situation regarding Characinds. Of course no pharyngial
> teeth.
> The case is for a microphagous stream inhabitant species
> for which cuantification of food must be atempted. The size
> range is minow like. The gut content of próximal part of
> tract is not macerated.
> Hope to get some repplies.
> Cheers,
>
> Eduardo Sendra
> Institute of Limnology of La Plata
> Argentina
>
> Quoting stefano mariani <[log in to unmask]>:
>
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> >
> > Dear folks,
> > we are working on the feeding habits of some targeted
> cyprinid species
> > in temperate European waters, and we are of course
> finding a high
> > degree of maceration in the gut content (as a result
> of the efficiency
> > of pharyngeal teeth!).
> > We intend to apply Haynes' (1950) "point
> method", then using some
> > modification.
> > Can anyone explain what is the best (standardised?)
> way to assign the
> > values to the different food items?
> >
> > Thank you very much in advance for any help!
> >
> >
> > Dr Stefano Mariani
> > MARine Biodiversity, Ecology & Evolution
> > UCD School of Biology & Environmental Science
> > Science and Education Research Centre (West)
> > University College Dublin
> > Belfield
> > Dublin 4
> > Republic of Ireland
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> > fax. +353.1.716.1152
> > http://www.ucd.ie/zoology/marbee/stefano_mariani.html
> >
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