Effects of dietary exposure to the pyrethroid pesticide esfenvalerate on medaka (Oryzias latipes).

Journal Article (Journal Article)

The pyrethroid insecticide esfenvalerate is widely used on orchard crops throughout California. In the aquatic environment, this compound is likely to accumulate in sediments, food particles and benthic organisms due to its lipophilicity and environmental persistence. This pilot project tested the hypothesis that esfenvalerate is toxic to medaka (Oryzias latipes) when taken up with the diet. For 7 days fish were fed diets, which contained esfenvalerate in three different concentrations (4, 21, 148 mg/kg, measured). Endpoints measured were mortality, fecundity, fertilization and hatching success of embryos, viability of larvae and cellular stress protein (hsp60, hsp70, hsp90) levels. The toxicity of aqueous exposure of medaka to esfenvalerate was also determined. Whereas the 96-h LC50 in the aqueous exposure was <9.4 microg/l, the dietary exposure did not cause mortality. Possible effects of dietary esfenvalerate were seen on fertilization and hatching success and the number of non-viable larvae. Expression of hsp60 and hsp90 showed a dose-dependent response pattern.

Full Text

Duke Authors

Cited Authors

  • Werner, I; Geist, J; Okihiro, M; Rosenkranz, P; Hinton, DE

Published Date

  • September 2002

Published In

Volume / Issue

  • 54 / 3-5

Start / End Page

  • 609 - 614

PubMed ID

  • 12408625

Electronic International Standard Serial Number (EISSN)

  • 1879-0291

International Standard Serial Number (ISSN)

  • 0141-1136

Digital Object Identifier (DOI)

  • 10.1016/s0141-1136(02)00151-4


  • eng