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Main Title Field Confirmation of a Laboratory-Derived Hazard Assessment of the Acute Toxicity of Fenthion to Pink Shrimp, 'Penaeus duorarum'.
Author Borthwick, P. W. ; Clark, J. R. ; Montgomery, R. M. ; Patrick, J. M. ; Lores, E. M. ;
CORP Author Environmental Research Lab., Gulf Breeze, FL. ;University of West Florida, Pensacola.
Year Published 1985
Report Number EPA/600/D-85/033;
Stock Number PB85-169613
Additional Subjects Toxicity ; Shrimps ; Water pollution ; Pesticides ; Hazards ; Mortality ; Sampling ; Exposure ; Field tests ; Concentration ; Sea water ; Culicidae ; Spraying ; Chemical analysis ; Minnows ; Survival ; Penaeus duorarum ; Fenthion ; Salt marshes
Library Call Number Additional Info Location Last
NTIS  PB85-169613 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 27p
Abstract Field studies were conducted to determine if laboratory protocols accurately predict shrimp mortality under field conditions. Fenthion, a mosquitocide, was applied to coastal marshes in several truck-mounted ultra-low volume (ULV) adulticide operations, and by direct application at the larvicide rate. Pink shrimp (Penaeus duorarum) were deployed in floating cages and observed for mortality. Water samples characterized the exposure regime and fate of fenthion at the field sites. The acute flow-through 96-h LC50 of 0.11 micrograms/l was used as a conservative estimate of the expected toxicity in field exposures. An exposure profile based on measured field concentrations was used for laboratory pulse-exposures: fenthion was metered for 2 h to specified maximum concentrations, then flushed with seawater to cause a 6 to 8 h exposure, yielding a no-observed-effect concentration (NOEC) of 0.84 micrograms/l. Four ULV sprays produced water concentrations less than NOEC and no fenthion-induced shrimp mortality. However, the direct application's water concentrations ranged from 15 to 20 micrograms/l (less than NOEC) and caused extensive mortality (90 to 100%). Field observations confirmed our hypothesis that if peak fenthion concentrations were lower than the laboratory NOEC, then no mortality would occur, whereas if maximum concentrations exceeded the NOEC, mortality would occur. These laboratory toxicity tests can predict the range of lethal and non-lethal acute field exposures to fenthion for pink shrimp when exposure regimes are similar.
Supplementary Notes Prepared in cooperation with University of West Florida, Pensacola.
PUB Date Free Form Feb 85
Category Codes 8A; 6T; 6F; 7B; 68D; 47D; 57Y; 57P
NTIS Prices PC A03/MF A01
Primary Description 600/04
Document Type NT
Cataloging Source NTIS/MT
Control Number 514424044
Origin NTIS
Type CAT