Accumulation and toxic effect of cypermethrin and chlorpyrifos on native fish Jenynsia multidentata (Anablapidae)

AMÉ, MARÍA VALERIA

Chascomús

Simposio; XVI Jornadas Anuales de la Sociedad Argentina de Biología; 2014

Sociedad Argentina de Biología

Cypermethrin (CYP) and Chlorpyrifos (CPF) are insecticides broadly used in Argentina for agriculture and domestic purposes. Both pesticides have been detected in local surface waterbodies and could have an adverse impact on the health of non-target biota. The aim of the present study was to evaluate the bioaccumulation and toxic effects of CYP and CPF when the native fish Jenynsia multidentata was exposed to these pesticides singly as well as in technical and commercial mixtures. Thus, adult female fishes were exposed over 96 h to 0.04 µg/L of CYP; 0.4 of CPF; 0.04 µg/L CYP + 0.4 µg/L CPF in a technical mixture; and 0.04 µg/L CYP + 0.4 µg/L CPF in a mixture of commercial products. Treatment-dependent tissue accumulation was observed by GC-ECD. CYP was detected in muscle after single exposure, in liver and gut after technical mix exposure and in gut and gills after commercial mix exposure. Moreover, CPF was detected in liver, gut and gills after single exposure and in liver, gut, gills and muscle after commercial mix exposure. Tested concentrations of CYP, CPF, and both technical and commercial mixtures, produced behavioral changes, oxidative stress and inhibition of brain aromatase expression in J. multidentata. Since similar levels have been detected in aquatic systems, pesticides occurrence should be monitored in natural environments to prevent biodiversity effects.