Journal of Environmental Hydrology

ISSN 1058-3912

Electronic journal of the International Association for Environmental Hydrology 

On the World Wide Web at
JEH Volume 10 (2002), Paper 3, June 2002                   Posted June 30, 2002 

Laura Martinez-Tabche
Alejandro Chehue Romero
Leobardo Gómez-Oliván
Marcela Galar Martínez
Elena Olvera Hernández
Eugenia López López
Departamento de Toxicología, Sección de Graduados, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Del M. Hidalgo, D.F. Mexico

Above the Ignacio Ramirez Dam (IRD), malathion (MA) is used in agricultural activities to control pests. This compound is one of the most widely used organophosphate pesticides in Mexico. Both acute and sublethal toxicity, as well as insecticide kinetic uptake and depuration in juvenile trout (Oncorhynchus mykiss) were determined using spiked natural sediments. Lipid peroxidation level and acetylcholinesterase activity (AChE) were used as indicator param-eters of sublethal toxicity. The results of acute toxicity of MA in rainbow trout showed that 96h-LC 50 in water was 0.1164 mg/l while in sediments was 0.7650 mg/kg. All MA concentrations produce an increase in lipid peroxidation level and a decrease in AChE activity. The results of the kinetic model showed that the maximum rate of absorption was at 12 h with a rapid bioconcentration. When MA was desorbed from the sediment, the pesticide concentration was increased in the trout gill. The gills are organs with a great capacity of MA uptake in Oncorhynchus mykiss to produce a toxic effect in this organism.
Reference: Martinez-Tabche, L., A. C. Romero, L. Gómez-Oliván, M. G. Martínez, E. O. Hernández and E. L. López; Effect of Malathion in Ignacio Ramirez Dam Sediments on Rainbow Trout (
Onchorhynchus mykiss), Journal of Environmental Hydrology, Vol. 10, Paper 3, June 2002.

Laura Martinez-Tabche
Departamento de Toxicología, Sección de Graduados
Escuela Nacional de Ciencias Biológicas
Instituto Politécnico Nacional
Apartado Postal 105-314
Del M. Hidalgo,
C.P. 11340 D.F. Mexico


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