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Re: Analysis of stomach content.


Lionel Dabbadie <[log in to unmask]>


Academic forum on fisheries ecology and related topics <[log in to unmask]>


Fri, 29 Aug 1997 12:01:55 +0200





text/plain (1 lines)

Dear Johansen,

Your problem is quite similar to the one I encountered with tilapia
Oreochromis niloticus, an omnivorous-detritivorous fish. I believe it's a
most general problem in fish feeding behavior studies. The way I solved it
was inspired using enclosed bibliography. I considered stomach content
being composed of two components. A particulate one that can be easily
identified by optical microscopy, and an unparticulate component, which
remains indetermined.

If you need qualitative composition of the indeterminate componant, you can
use immunoassays as described by Feller. I didn't use these techniques,
because I couldn't (I was working in Africa, without equipment), but it
should be valuable.

Bowen adapted classical nutrition technics. I considered two indicators of
food quality : energy content, and amino acids. In short, you can convert
your optical measurements into energy or AA, using biovolume/energy and
biovolume/AA ratios. You also can measure this parameters on the stomac
content in its whole. By substracting the values for the stomach content in
its whole to values for the particulate components, you get as estimate of
the composition of the unparticulate component. Then, you can compare this
value to the natural feeds in the environment and to the fish growth.

With all these results you are able to take into account this undetermined
component of the food content, whose feeding importance may be very high.

Your's cordialy

Lionel Dabbadie

Ahlgren M.O., 1990 (a). Nutritional significance of
  facultative detritivory to the juvenile white sucker
  (Catostomus commersoni). Can. J. Fish. Aquat. Sci. 47 :

Ahlgren M.O., 1990 (b). Diet selection and the contribution
  of detritus to the diet of the juvenile white sucker
  (Catostomus commersoni). Can. J. Fish. Aquat. Sci. 47 :

Ahlgren M.O., Bowen S.H., 1991. Growth and survival of
 tadpoles (Bufo americanus) fed amorphous detritus derived
 from natural waters. Hydrobiologia 218 : 49-51.

Ahlgren M.O., Bowen S.H., 1992. Comparison of quantitative
  light microscopy techniques used in diet studies of
  detritus-consuming omnivores. Hydrobiologia 239 : 79-83.

Bowen S.H., Lutz E.V., Ahlgren M.O., 1995. Dietary protein
  and energy as determinants of food quality : trophic
  strategies compared. Ecology 76 (3) : 899-907.

Dabbadie L., 1996. Etude de la viabilite d'une pisciculture
  rurale a faible niveau d'intrant dans le Centre-Ouest de la
  Côte d'Ivoire : approche du reseau trophique. These doct.,
  Univ. Pierre et Marie Curie, Paris 6, France : 208 p.

Feller R.J., 1984. Serological tracers of meiofaunal food
  webs. In : Heip C. (ed). Developments in hydrobiology, vol.
  26. Biology of meiofauna. Actes coll., Ghent, Belgique,
  16-20 août 1983. Dr W. Junk (Publ.), Dordrecht, Netherlands
  : 119-126.

Feller R.J., 1992. Potential applications of immunoassays
  in studies of flatfish recruitment. Netherlands J. sea
  res. 29 (1/3) : 1-5.

Feller R.J., Ferguson R.B., 1988. Quantifying stomach
  contents using immunoassays a critique. In : Yentsch,
  C.M., Mague F.C. et Horan P.K. (eds). Lecture notes on
  coastal and estuarine studies, 25. Immunochemical
  approaches to coastal, estuarine and oceanographic
  questions. Actes coll., Portland, USA, 5-7 octobre 1986.
  Springer-Verlag (Publ.), New York, Etats Unis (399 p) :

Getachew T., Bowen S.H., Abebe E., Tadesse Z., soumis
  pour publication. Seasonal effects on diet quality for
  phytoplanktivorous Oreochromis niloticus in Lake Tana,
  Ethiopia. J. Environ. Fish. Biol. : 18 p.

                  -(@ @)-
* *
* Lionel Dabbadie *
* 6, rue des noyers *
* 42160 Andrezieux-Boutheon *
* France *
* *
* Tel / Fax : (33) [0] 4 77 55 66 21 *
* Email : [log in to unmask] *
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