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dc.contributor.authorBurford, MA
dc.contributor.authorPreston, NP
dc.contributor.authorTruong, HM
dc.contributor.authorTran, TTH
dc.contributor.authorBunn, SE
dc.contributor.authorFry, VM
dc.description.abstractStable isotope analysis was used to determine the sources of dietary nitrogen (N) and carbon (C) for shrimp during the rearing phase in extensive rice-shrimp ponds in My Xuyen and Gia Rai districts, Vietnam. Farm-made feed was added as a food source in shrimp ponds in My Xuyen district, and based on stable isotope analyses, was generally a poor dietary source. The commercial formulated feed used in Gia Rai also appeared to contribute little directly to the nutritional needs of the shrimp. In contrast, the natural biota in all ponds appeared to contribute substantially. In particular, biota from beam trawls and benthic organic matter were the most likely sources of nutrition in My Xuyen ponds, while benthic organic matter was the main source in Gia Rai ponds. δ15N ratios in the natural biota in My Xuyen farms decreased over the growing season, suggesting increased N fixation in the case of the benthic organic matter reaching values as low as 1‰. This suggests N-limitation in the ponds and that natural biota become increasingly dependent on N fixed by algae and/or other microorganisms. There is the potential to promote the growth of the plankton and hence, the other natural biota, by the judicious addition of fertilizer.
dc.publisherBlackwell Publishing Ltd.
dc.publisher.placeUnited Kingdom
dc.relation.ispartofjournalAquaculture Research
dc.subject.fieldofresearchFisheries Sciences
dc.titleDominant sources of dietary carbon and nitrogen for shrimp reared in extensive rice-shrimp ponds.
dc.typeJournal article
dc.type.descriptionC1 - Articles
gro.facultyFaculty of Environmental Sciences
gro.rights.copyrightCopyright 2004 Blackwell Publishing. The definitive version is available at []
gro.hasfulltextNo Full Text
gro.griffith.authorBunn, Stuart E.
gro.griffith.authorFry, Vanessa M.
gro.griffith.authorBurford, Michele A.

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