RESUMEN Este estudio describe insecticidas organoclorados en peces Cyptinus cnrpio y Tihpia sp. colectados durante 1985-86 en las aguas de los canales y drenes del valle agrfcola de Mexicali, situado en Baja California, México. Las concentracionesde DDTfueron significativas en todas las muestras colectadas. No se detectaron niveles importantes de otros compuestos orgánicos sint6ticos. De las dos especies de peces examinadas, C. carpio mostró concentraciones mayores de DDT. Se discuten los resultados en relación a la contaminación temporal y geográfica. También, los resultados no indican una contaminación por DDT en estas especies que amenace a la salud pública. Especies de peces similares que fueron capturados en el Valle Imperial, EUA (aledaño al Valle de Mexicali), presentaron concentracionesmayores de DDT en el músculo axial que los peces capturados al sur en Baja California, M6xico. This study describes organochlorine insecticides in fishes Cyprinus Carpio and Tilapia sp. collected during 1985-86 from freshwater drainage and irrigation canals of the agricultura1 Mexicali Valley of Baja California, Mexico. DDT concentrations were significant at all sampling sites. Important levels of other synthetic organic compounds were not detected. Of the two species examined, C. Carpio exhibited the highest DDT concentrations. The results are discussed in relation to temporal and geographical pollution. Also, the results indicate no major threat to public health from DDT in these species. Similar species of fish caught in Imperial Valley, USA (near the Mexicali Valley), had higher DDT concentrations in the axial muscle tissue than specimens caught to the south in Baja California, Mexico. INTRODUCCION INTRODUCIION A partir de la década de los años 40, As of the 194O's, the pesticides most los pesticidas mayormente aplicados en varios used in severa1 countries were those of the palses fueron los del tipo clorados. Con el chlorinated type. With time, thesc have been tiempo, estos han sido sustituidos por produc-replaced by products with different physico-1
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.