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Bioconcentration and effects of hexabromocyclododecane exposure in crucian carp (Carassius auratus)

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Abstract

As a cycloaliphatic brominated flame retardant, hexabromocyclododecane (HBCD) has been widely used in building thermal insulation and fireproof materials. However, there is little information on the bioconcentration as well as effects with respect to HBCD exposure in the aquatic environment. To investigate the bioconcentration of HBCD in tissues (muscle and liver) and its biochemical and behavioural effects, juvenile crucian carp (Carassius auratus) were exposed to different concentrations of technical HBCD (nominal concentrations, 2, 20, 200 μg/L) for 7 days, using a flow-through exposure system. HBCD was found to concentrate in the liver and muscle with a terminal concentration of 0.60 ± 0.22 μg/g lw (lipid weight) and 0.18 ± 0.02 μg/g lw, respectively, at an environmentally-relevant concentration (2 μg/L). The total thyroxine and total triiodothyronine in the fish plasma were lowered as a result of exposure to the HBCD. Acetylcholinesterase activity in the brain was increased, while swimming activity was inhibited and shoaling inclination was enhanced after exposure to 200 μg/L HBCD. Feeding rate was suppressed in the 20 and 200 μg/L treatment groups. In summary, HBCD concentrations 10–100× higher than the current environmentally-relevant exposures induced adverse effects in the fish species tested in this study. These results suggest that increasing environmental concentrations and/or species with higher sensitivity than carp might be adversely affected by HBCD.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant 51769034, 51509071), the National Science Funds for Creative Research Groups of China (Grant 51421006), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Correspondence to Guanghua Lu.

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The authors declare that they have no conflict of interest.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. This article does not contain any studies with human participants performed by any of the authors.

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It was obtained from all individual participants included in the study.

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Dong, H., Lu, G., Yan, Z. et al. Bioconcentration and effects of hexabromocyclododecane exposure in crucian carp (Carassius auratus). Ecotoxicology 27, 313–324 (2018). https://doi.org/10.1007/s10646-018-1896-6

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  • DOI: https://doi.org/10.1007/s10646-018-1896-6

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