Organochlorines, organophosphates, and pyrethroids in channel catfish, rainbow trout, and red swamp crayfish from aquaculture facilities

Channel catfish (Ictalurus punctatus), rainbow trout (Oncorhynchus mykiss), and red swamp crayfish (Procambarus clarkii) were collected from 8 souther n states in the United States and analyzed for 34 organochlorine, organopho sphate, and pyrethroid compounds. Approximately 45% of catfish, 72% of trou t, and 92% of crayfish contained no detectable residues. Most residues dete cted were well below action limits for fish. Chlorpyrifos, for which there is no established tolerance, was detected in catfish; however, residues of this pesticide were not detected in samples collected after the 1st year of the study. The data collected during this study further support the safety of aquaculture products.