Document Detail

Feeding level and diet quality influence trophic shift of C and N isotopes in Nile tilapia (Oreochromis niloticus (L.)).
MedLine Citation:
PMID:  12872804     Owner:  NLM     Status:  MEDLINE    
Many scientists use naturally occurring stable isotopes to reconstruct the diets of animals. However, isotopic ratios may be affected not only by the composition of the diet but also by the amount of food consumed. Thus, an experiment using tilapia (Oreochromis niloticus) was carried out to test the influence of feeding level on delta13C and delta15N of fish given a semi-synthetic wheat gluten/wheat starch based diet. In addition, the effect of diet quality was tested by comparing tilapia given this feed with tilapia fed a fish meal/wheat meal based diet. Forty-four tilapia were reared individually. After a prefeeding phase, fish were randomly assigned to five groups, four on the semi-synthetic diet at different feeding levels and one group on the fish meal/wheat meal based diet fed at the equivalent of the highest level of the semi-synthetic diet. The experiment lasted eight weeks. Proximate composition, gross energy content and delta13C and delta15N values were determined in feed and fish, for delta13C separately in the lipids and the lipid-free matter. Delta13C in the lipids and the lipid-free matter and delta15N of tilapia fed the semi-synthetic diet decreased significantly with increasing feeding rate. The absolute values of the trophic shift in fish fed the semi-synthetic wheat based diet were significantly higher than in fish fed the fish meal/wheat meal based diet. The different delta13C and delta15N values in tilapia fed the same diet at different feeding levels and the influence of feed quality on the trophic shift add to the uncertainty involved in the use of stable isotopes in ecological research.
J Gaye-Siessegger; U Focken; H J Abel; K Becker
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Isotopes in environmental and health studies     Volume:  39     ISSN:  1025-6016     ISO Abbreviation:  Isotopes Environ Health Stud     Publication Date:  2003 Jun 
Date Detail:
Created Date:  2003-07-22     Completed Date:  2003-10-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9602611     Medline TA:  Isotopes Environ Health Stud     Country:  England    
Other Details:
Languages:  eng     Pagination:  125-34     Citation Subset:  IM    
Department of Aquaculture Systems and Animal Nutrition in the Tropics and Stubtropics, University of Hohenheim (480b), Fruwirthstr. 12, 70599 Stuttgart, Germany.
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MeSH Terms
Animal Feed
Carbon Isotopes / analysis
Environmental Monitoring / methods
Food Chain*
Nitrogen Isotopes / analysis
Tissue Distribution
Reg. No./Substance:
0/Carbon Isotopes; 0/Nitrogen Isotopes

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