Life history traits; AngHV-1; Phenotypic sex; Organic pollutants; Restocking; European eel
Abstract :
[en] By combining field research and careful laboratory analysis of samples over the course of an eight-year study, we
met the challenge of assessing the life history traits and health status of eels restocked in freshwater ecosystems.
We found that restocked eels exhibited good growth performance; moreover, the stocks were femaledominated,
showed a good Fulton's condition factor (K) and lipid stores and had high survival probability estimated
using the best model of Jolly-Seber stock assessment method for open populations. A necropsy revealed
the absence of internal lesions. A swimbladder examination revealed the absence of the parasite Anguillicola crassus.
Polymerase chain reaction (PCR) analyses revealed an increase of Anguillid herpesvirus-1 (AngHV-1) prevalence
throughout the study. Most positive subjects expressed viral loads compatible with a latent infection and
correlated positively with K. All restocked eels were contaminated by at least one of the organic pollutant congeners
studied, but the pollution loads corresponded to the lowest range of pollutant concentrations reported in the
available literature for European eels and did not exceed the maximum residue and contaminant limits in food
and feed of several national and international regulations. Pollutant loads were negatively correlated with K,
lipid content and eel density for polychlorinated biphenyls PCB 138, 153 and 180 and K for pesticides p.p’-
DDE, p.p’-DDD, p.p’-DDT and PBDE47. This study highlights the potential role played by upland aquaticecosystems in enhancing riverine silver eel production from the perspective of species conservation. To be successful,
restocking must be accompanied by improved ecosystem quality and migration routes for eels in inland
freshwaters. We also provide some recommendations for future research to improve the management of
restocking programmes.
Research Center/Unit :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège FARAH - Fundamental and Applied Research for Animals and Health - ULiège
Disciplines :
Environmental sciences & ecology
Author, co-author :
Nzau Matondo, Billy ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Gestion des ressources aquatiques et aquaculture
Delrez, Natacha ; Université de Liège - ULiège > Département des maladies infectieuses et parasitaires (DMI)
Joaquim-Justo, Célia ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Ecologie animale et écotoxicologie
Rives, Jacques; INRAe
Benitez, Jean-Philippe ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Gestion des ressources aquatiques et aquaculture
Dierckx, Arnaud ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Département de Biologie, Ecologie et Evolution
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