Fish life-history traits are affected after chronic dietary exposure to an environmentally realistic marine mixture of PCBs and PBDEs
|Author(s)||Horri Khaled1, 7, Alfonso Sebastien2, Cousin Xavier3, 4, Munschy Catherine5, Loizeau Veronique6, Aroua Salima7, Begout Marie-Laure2, Ernande Bruno1|
|Affiliation(s)||1 : IFREMER, Ctr Manche Mer Nord, Lab Ressources Halieut, 150 Quai Gambetta, F-62200 Boulogne, France.
2 : IFREMER, Stn Rochelle, Lab Ressources Halieut, Pl Gaby Coll,BP7, F-17137 Lhoumeau, France.
3 : IFREMER, Lab Adaptat & Adaptabilites Animaux & Syst, UMR MARBEC, CNRS,IRD,UM2, Route Maguelone, F-34250 Palavas Les Flots, France.
4 : Univ Paris Saclay, INRA, UMR GABI, AgroParisTech, I-78350 Jouy En Josas, France.
5 : IFREMER, Ctr Atlantique, Lab Biogeochim Contaminants Organ, Rue Ile Yeu,BP 21105, F-44311 Nantes 3, France.
6 : IFREMER, Ctr Bretagne, Lab Biogeochim Contaminants Organ, ZI Pointe Diable, CS 10070, F-29280 Plouzane, France.
7 : Univ Le Havre Normandie, FR CNRS Scale 3730, UMR SEBIO 102, CIRCA,INERIS,URCA,ULH,Unite Stress Environm & BIO, F-76063 Le Havre, France.
|Source||Science Of The Total Environment (0048-9697) (Elsevier Science Bv), 2018-01 , Vol. 610-611 , P. 531-545|
|WOS© Times Cited||36|
|Keyword(s)||Contaminants, Body length, Condition, Fertilization rate, Energy allocation, Trade-off|
Polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants that have been shown to affect fish life-history traits such as reproductive success, growth and survival. At the individual level, their toxicity and underlying mechanisms of action have been studied through experimental exposure. However, the number of experimental studies approaching marine environmental situations is scarce, i.e., in most cases, individuals are exposed to either single congeners, or single types of molecules, or high concentrations, so that results can hardly be transposed to natural populations. In the present study, we evaluated the effect of chronic dietary exposure to an environmentally realistic marine mixture of PCB and PBDE congeners on zebrafish life-history traits from larval to adult stage. Exposure was conducted through diet from the first meal and throughout the life cycle of the fish. The mixture was composed so as to approach environmentally relevant marine conditions in terms of both congener composition and concentrations. Life-history traits of exposed fish were compared to those of control individuals using several replicate populations in each treatment. We found evidence of slower body growth, but to a larger asymptotic length, and delayed spawning probability in exposed fish. In addition, offspring issued from early spawning events of exposed fish exhibited a lower larval survival under starvation condition. Given their strong dependency on life-history traits, marine fish population dynamics and associated fisheries productivity for commercial species could be affected by such individual-level effects of PCBs and PBDEs on somatic growth, spawning probability and larval survival.