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► The toxic effects of triclosan on swordtail were assessed via a multi-biomarker approach. ► The expression levels of CYP1A, CYP3A, GST and P-gp are related to triclosan exposure. ► mRNA expression levels are more sensitive than their corresponding enzymatic activities. ► The male fish displayed higher gene expression levels and more dramatic changes in enzyme activities than the females.
The toxic effects of triclosan (TCS) on the swordtail fish (Xiphophorus helleri) were assessed based on various biomarkers including enzymatic activities of ethoxyresorufin O-deethylase (EROD), erythromycin N-demethylase (ERND) and glutathione-s-transferase (GST) and mRNA expression levels of CYP1A, CYP3A, glutathione S-transferase (GST) and P-glycoprotein (P-gp). The acute toxicity test showed the LC50 value of 1.47mgL−1 for TCS. The mRNA expressions of CYP1A, CYP3A, GST and P-gp showed dose–effect relationships in female swordtail fish when exposed to TCS, These mRNA expression levels were found more sensitive to TCS exposure than the enzymatic activities of EROD, ERND and GST do. In addition, the male fish displayed higher gene expression levels and more dramatic changes in enzyme activities than the females did. Our data further demonstrated that TCS was a typical inducer to Phase I and Phase II metabolism enzymes and genes, suggesting it is a potential ecotoxicological risk to aquatic ecosystems.