Record Display for the EPA National Library Catalog


Main Title Effects of Diet Quantity on Sheepshead Minnows 'Cyprinodon variegatus' during Early Life-Stage Exposures to Chlorpyrifos.
Author Cripe, G. M. ; Hansen, D. J. ; Macauley, S. F. ; Forester, J. ;
CORP Author Environmental Research Lab., Gulf Breeze, FL.
Year Published 1985
Report Number EPA/600/D-85/117;
Stock Number PB85-210326
Additional Subjects Toxicity ; Diets ; Minnows ; Water pollution ; Chlorine organic compounds ; Tests ; Feeding stuffs ; Volume ; Growth ; Exposure ; Concentration(Composition) ; Weight(Mass) ; Tissues(Biology) ; Survival ; Cyprinodon variegatus ; Sheepshead minnows ; Chlorpyrifos ; Artemia
Library Call Number Additional Info Location Last
NTIS  PB85-210326 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 23p
The influence of food quantity on the effects of chlorpyrifos was determined in six early life-stage (ELS) toxicity tests with estuarine sheepshead minnows, Cyprinodon variegatus. Three ELS tests were conducted simultaneously, each with a different feeding density: approximately 20, 110 or 550 Artemia nauplii/fish per feeding. In the first series of three tests, growth was significantly reduced (p greater than or equal to 0.001) at nearly all feeding densities and concentrations tested (3.1 to 52 micrograms chlorpyrifos/l). Therefore, a second series of tests was conducted at lower chlorpyrifos concentrations that ranged from 0.4 to 6.8 micrograms/l and at the same feeding densities. At test termination bioconcentration factors (amount of chlorpyrifos in tissue divided by average measured water concentrations) and chlorpyrifos in whole fish at exposure concentrations greater than or equal to 3.0 micrograms/l generally increased with increasing Artemia densities and increasing chlorpyrifos concentrations.