Poster3 XB

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Published on September 14, 2007

Author: Eagle

Source: authorstream.com

Modelling the PCB bioaccumulation in the hake (Merluccius merluccius) from the Gulf of Lions (Mediterranean sea):  Modelling the PCB bioaccumulation in the hake (Merluccius merluccius) from the Gulf of Lions (Mediterranean sea) X. Bodiguel1, V. Loizeau1, C. Mellon2, F. Ferraton2 1IFREMER, BP 70, 29280 Plouzané, France ; 2IFREMER, B.P. 171, Av. J. Monnet 34203 Sète Cedex France Objectives To evaluate the PCB contamination in hakes from the Gulf of Lions. To establish the bases of a bioaccumulation model of PCBs in a female hake. Polychlorinated Biphenyls (PCBs), are characterized by a high persistence in the environment, bioaccumulation by the marine organisms and potentially toxic character. Bioaccumulation depends on physical and chemical properties of the compounds and biological factors like feeding, growth and reproduction. At the top of a complex trophic web, the Mediterranean hake (Merluccius merluccius; L, 1758) is potentially exposed to these contaminants and it is significant to evaluate its contamination level and contamination mechanisms. Conclusions 44 liver analyses (individuals from 10 to 34 cm) 17 PCBs congeners (CBs) by GC – ECD. Major occurrence of CB153 and CB138 Important presence of DDE (metabolite of DDT) Evaluate the fate of PCBs in hakes from the gulf of Lions. Modelling the PCB bioaccumulation (Dynamic Energy Budget approach) Introduction Future model development: Taking into account bio-transformation. Validation for other PCB congeners and other contaminants (Hg). Extension to male hakes. Extension to the hake population and its trophic web. Contribution of contamination by water during breathing. Quantify the contribution and elimination of CB 153 during all the life of a female hake. Uptake : food Losses : excretion, spawning, dilution by growth. The comparison between growth model outputs and hake weight and length measurements validates the growth model during the whole life of a female hake. The PCB bioaccumulation simulation seems to be acceptable compared to the few analysis results. Results Principle Objective Results PCB Analysis Study area Conceptual diagram PCB chromatogram in a male hake liver of 34 cm. Mediterranean hakes are significantly contaminated by PCBs. This contamination seems to be correlated according to growth, probably with the diet evolution and maturation degree. The bioaccumulation model simulates rather well the growth and contamination of an immature hake female. xbodigue@ifremer.fr Growth model Food contained energy is assimilated proportionally to the hake surface area and stocked in the energy storage compartment (constant efficiency). Stored energy is allocated to the soma and for maturity (for juvenils) or reproduction (for adults). Maintenance is proportional to the amount of structure Adults spawn one time each year, at a fixed date. Starvation during winter Initial condition: - Egg energy content Forcing variables: - Water temperature - No limiting food Coupled contaminant model PCB allocation is described likely and proportionally to the fixed energy allocation PCB food content varying with hake diet Stored PCB are allocated to somatic and gonadic compartments, proportionally to the energy flow to biovolume and gonads respectively. PCB mobilisation from reserves is function to the PCB storage concentration. PCBs are expulsed during the annual spawning. Forcing variable : - PCB prey concentration - Energy prey value. CB153 : 230 to 1700 ng.g-1 DW (for a juvenile hake of 11,5 cm and a male adult of 34 cm) Concentrations 5 to 8 times higher than in hakes from the Bay of Biscay No influence of the Rhone river between the two studied areas High inter-individual variability, probably due to their physiological properties. Assumptions explaining the variations: Hake lenght (growth) Hake sex Sexual maturation degree Diet evolution CB 153 concentration in the hake livers function of their length

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