Bioaccumulation of trace metal elements and biomarker responses in caged juvenile flounder at a polluted site: Effects of fish density and time exposure

Mamadou Diop (1) , Jérôme Couteau (2, 3) , Anne Bado-Nilles (2, 3) , Eric Tavernier (1) , Baghdad Ouddane (4) , Jeremy Denis (1) , Gwendoline Duong (1) , François Gevaert (1) , Sebastien Monchy (1) , Jean Laroche (5) , Rachid Amara (1)

1 LOG - Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187
2 TOXEM
3 SEBIO - Stress Environnementaux et BIOsurveillance des milieux aquatiques
4 LASIRE - Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516
5 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)

This study investigates the effect of fish density and exposure duration on trace metal elements (TME) bioaccumulation and several biomarkers response. Juvenile flounders were caged at low, medium and high densities and exposed during 15 or 30 days in the Seine estuary. The concentrations of the TME measured in the muscle of the caged fish were all in agreement with their bioavailability percentage in the sediments. Higher concentrations of TME were found in flounders' muscle exposed for 15 days compared with those caged for 30 days. For the same exposure time, the density of fish had no effect on the accumulation of the TME in the flounders' muscle. Biomarkers responses varied according to density and duration of exposure. Special care should be taken in their interpretation. We underline that for an optimal assessment of TME pollution in the field, 15 days with low densities of fish per cage are sufficient.

Mots clés: Flounder density; Trace metal element; Caging duration; Biomonitoring; Fitness indices; Biomarkers of damage; Innate immune response; Flounder density

Domaines: Ecotoxicologie; Biodiversité et Ecologie

Mamadou Diop, Jérôme Couteau, Anne Bado-Nilles, Eric Tavernier, Baghdad Ouddane, et al.. Bioaccumulation of trace metal elements and biomarker responses in caged juvenile flounder at a polluted site: Effects of fish density and time exposure. Marine Pollution Bulletin, 2022, 185 (Part A), pp.114289. ⟨10.1016/j.marpolbul.2022.114289⟩. ⟨hal-03854496⟩