Lethal and sublethal effects of esfenvalerate and diazinon on splittail larvae

Swee J Teh, Guo H. Zhang, Tom Kimball, Foo C. Teh

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Runoff from dormant spray applications to orchards can contain the insecticides diazinon and esfenvalerate, which may affect the health of the threatened splittail Pogonichthys macrolepidotus. To examine the potential effects of these two insecticides, splittail larvae were exposed to diazinon, esfenvalerate, and a mixture of the two insecticides in static renewal 96-h acute toxicity tests. Surviving fish were transferred to clean water for an additional 14 d (18 d total). Mortality, morphological anomalies, histopathology, and growth determinations were made to assess lethal and sublethal effects. The combination of diazinon and esfenvalerate produced less than additive (independent) toxicity. Diazinon (singly and in combination with esfenvalerate) produced latent toxicity after the 96-h exposure, as demonstrated by reduced growth and increased spinal deformities. Metabolic dysfunction in the liver and inflammation of the pancreas were likely related to slower growth of diazinon-exposed fish. These symptoms were almost absent from esfenvalerate-exposed fish. The use of 14-d EC50 values and the measurement of biomarkers may more accurately describe the effects of 96-h short-term exposure to these insecticides than traditional 96-h LC50 values.

Original languageEnglish (US)
Pages (from-to)243-253
Number of pages11
JournalAmerican Fisheries Society Symposium
Volume2004
Issue number39
StatePublished - 2004

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esfenvalerate
diazinon
sublethal effect
sublethal effects
insecticide
larva
insecticides
larvae
toxicity
growth determination
fish
histopathology
acute toxicity
toxicity testing
toxicity test
orchard
pancreas
lethal concentration 50
spray
signs and symptoms (animals and humans)

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Lethal and sublethal effects of esfenvalerate and diazinon on splittail larvae. / Teh, Swee J; Zhang, Guo H.; Kimball, Tom; Teh, Foo C.

In: American Fisheries Society Symposium, Vol. 2004, No. 39, 2004, p. 243-253.

Research output: Contribution to journalArticle

Teh, Swee J ; Zhang, Guo H. ; Kimball, Tom ; Teh, Foo C. / Lethal and sublethal effects of esfenvalerate and diazinon on splittail larvae. In: American Fisheries Society Symposium. 2004 ; Vol. 2004, No. 39. pp. 243-253.
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