PCB congeners to monitor with caged juvenile fish in the upper Hudson river

A distinct pattern of consistently most abundant PCB congeners is identified in caged juvenile fish during a developmental monitoring study of bioaccumulation in the upper Hudson River, 1985. An identical qualitative congener pattern is recognized in juvenile fish after 28-d exposures in the late spring, summer and fall, even though each period is characterized by a different temperature and flow regime in the river. The same congener pattern is evident after only 3 d of exposure and persists until at least 42 d. Due to their physicochemical properties, biological half-life in fish and site-specific abundance in the upper Hudson River sediments, 1 tri-CB, 13 tetra-CBs and 3 penta-CBs (3,4,4′; 2,2′,3,4′; 2,2′,3,5′; 2,2′,4,4′; 2,2′,4,5; 2,2′,4,5′; 2,2′,5,5′; 2,3,3′,6; 2,3,4,5; 2,3′,4,4′; 2,3′,4′,5; 2,3′,5′,6; 2,4,4′,6; 2′,3,4,5; 2,2′,3,5,6; 2,2′,3,5′,6; and 2,2′,4,6,6′) are the congeners to monitor over the short term.