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1,2,5,6,9,10-hexabromocyclododecane (HBCD), a widely used flame retardant, is an ubiquitous contaminant in
the environment. Still, only little is known about the distribution and behavior in the environment such as
bioaccumulation or biotransformation of HBCD stereoisomers. In order to investigate enrichment and possible
bioisomerization of HBCD stereoisomers, Mirror Carps were exposed to pure (+)- and (-)-γ-HBCD, randomly
sampled after a predefined specific period and subjected to enantiomer-specific determination of α-, β-, and γ-
HBCD. No evidence for the isomerization of HBCD stereoisomers was observed in Mirror Carp fillets.