The metabolism and distribution of 2, 4-dichloroaniline (2, 4-DCA), prochloraz and 4-n- nonylphenol diethoxylate (NP2EO) were investigated in vivo and in vitro in rainbow trout (Oncorhynchus mykiss). Each compound was administered po (10 mg/kg wet weight) and urine was collected during 48 h (2, 4-DCA, prochloraz) or 72 h (NP2EO). Fish were sacrificed, the gall bladder was excised and radioactivity was measured in tissues, viscera ...