Carbon, nitrogen and phosphorus elemental stoichiometry in aquacultured and wild-caught fish and consequences for pelagic nutrient dynamics |
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Authors: | Marie Czamanski Adi Nugraha Philippe Pondaven Marine Lasbleiz Annick Masson Nicolas Caroff Robert Bellail and Paul Tréguer |
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Institution: | (1) Laboratoire des Sciences de l’Environnement Marin, Institut Universitaire Europ?en de la Mer, IUEM, Universit? Europ?enne de Bretagne, Universit? de Brest, LEMAR, UMR 6539, CNRS, IRD, Technop?le Brest Iroise, Place Nicolas Corpernic, 29280 Plouzan?, France;(2) STH/Laboratoire de Biologie Halieutique, IFREMER, Z.I. Pointe du Diable, B.P. 70, 29280 Plouzan?, France;(3) STH/Laboratoire de Biologie Halieutique, IFREMER, 8 Rue Fran?ois Toullec, 56100 Lorient, France |
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Abstract: | The elemental carbon (C), nitrogen (N) and phosphorus (P) compositions of the whole-body and gut content of wild marine fish
inhabiting the Bay of Biscay (Northeast Atlantic) were studied. Furthermore, the literature was examined for studies of aquacultured
fish, reporting the elemental composition of the whole-body fish, that of their food, and nutrient assimilation and gross
growth efficiencies (GGE). In both wild-caught and aquacultured fish, significant differences in C, N and P elemental composition
were found between species, with P being the most variable component. Differences among species in terms of C, N and P content
could be explained by varying proportions of storage compounds in whole-body fish, and varying degrees of ossification. Aquacultured
fish feces were found to be P-rich, because of a lower P assimilation efficiency, compared to C or N assimilation efficiencies.
Examination of aquacultured fish literature also revealed that C, N and P GGE and nutrient resupply ratios agreed with basic
principles of homeostatic regulation of whole-body fish elemental composition. Extrapolation of the results to broader marine
systems indicated that fish may be important for conveying nutrients toward the ocean interior. |
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