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Cytochrome P450 aromatase (CYP19) plays an important role in steroid homoeostasis by converting androgens to estrogens. To evaluate the effects of benzo(a)pyrene (BaP), a model carcinogenic PAH and AhR ligand, on aromatase mRNA expression and enzyme activity, adult Fundulus were exposed to water-borne BaP (1 and 10μg/L) for 15 days, and embryos were exposed to 10μg/L for 10 days. Effects of BaP were...