Article (Scientific journals)
Isotopic half-life and enrichment factor in two species of European freshwater fish larvae: an experimental approach
Latli, Adrien; Sturaro, Nicolas; Dujardin, Nelson et al.
2017In Rapid Communications in Mass Spectrometry, 31 (8), p. 685-692
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Keywords :
isotopic turnover; fish; isotopic experiment; aquaculture
Abstract :
[en] RATIONALE: Stable isotope ratios of carbon and nitrogen are valuable tools for field ecologists to use to analyse animal diets. However, the application of these tools requires knowledge of the tissue enrichment factor (TEF) and half-life (HL). We experimentally compared TEF and HL in two freshwater fish larvae. We hypothesised that chub had a better growth/tissue replacement ratio than roach, due to the use of a food closer to their natural diet. METHODS: We determined the isotopic HL, the TEF and the contribution of growth or metabolic tissue replacement to dynamic isotopic incorporation. After yolk sac resorption, larvae were fed for 5 weeks with prey similar to their natural diet (Artemia nauplii) up to the isotopic equilibrium followed by Chironomid larvae. Stable isotope measurements were carried out using a continuous flow isotope ratio mass spectrometer coupled to an elemental analyser. RESULTS: Changes in isotopic composition strongly followed the predictions of exponential growth and time-dependent models. The isotopic HL varied between 8.2 and 12.6 days and the TEF of nitrogen and carbon ranged from 1.7 to 2.1‰ and from –0.9 to 1.2 ‰, respectively. The incorporation of dietary 13C was due more to the production of new tissue (between 56 and 79%) than to the metabolic process. Chub allocated more energy to growth than roach and the Chironomidae diet contributed more to the consumers’ growth than the Artemia diet. CONCLUSIONS: Metabolic rates seemed lower for chub than for roach, especially when they were fed with Chironomidae. A Chironomidae-based diet would be more profitable to chub, and the high associated growth rate could increase the development of the fish larvae. The HL and TEF were in the range of those reported in the literature. These results will be helpful for field-based studies, because they can help to increase the accuracy of models.
Research center :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
Disciplines :
Environmental sciences & ecology
Zoology
Aquatic sciences & oceanology
Author, co-author :
Latli, Adrien;  Université de Namur - UNamur > Research Unit in Environmental and Evolutionary Biology
Sturaro, Nicolas ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Dujardin, Nelson;  Université de Namur - UNamur > Research Unit in Environmental and Evolutionary Biology
Michel, Loïc  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Otjacques, William;  Université de Namur - UNamur > Research Unit in Environmental and Evolutionary Biology
Lepoint, Gilles  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Kestemont, Patrick;  Université de Namur - UNamur > Research Unit in Environmental and Evolutionary Biology
Language :
English
Title :
Isotopic half-life and enrichment factor in two species of European freshwater fish larvae: an experimental approach
Publication date :
30 April 2017
Journal title :
Rapid Communications in Mass Spectrometry
ISSN :
0951-4198
eISSN :
1097-0231
Publisher :
John Wiley & Sons, Chichester, United Kingdom
Volume :
31
Issue :
8
Pages :
685-692
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
SPW DG03-DGARNE - Service Public de Wallonie. Direction Générale Opérationnelle Agriculture, Ressources naturelles et Environnement [BE]
European Fisheries Fund (contract FEP 32-1109-004)
Available on ORBi :
since 15 March 2017

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