Induction of gene responses in St. Lawrence River northern pike (Esox lucius) environmentally exposed to perfluorinated compounds

► Municipal effluent may be a source of PFCs in the St. Lawrence River. ► PFECHS is detected in St. Lawrence northern pike tissues. ► Gene expression is higher in northern pike captured downstream a municipal effluent. ► Possible links may exist between PFCs, Vtg gene expression and Vtg protein activity.