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OLS Field Name OLS Field Data
Main Title Comparative Acute Sensitivities of Early Life Stages of Atherinid Fishes to Chlorpyrifos and Thiobencarb.
Author Borthwick, P. W. ; Patrick, J. M. ; Middaugh, D. P. ;
CORP Author Environmental Research Lab., Gulf Breeze, FL.
Year Published 1985
Report Number EPA/600/J-85/122;
Stock Number PB86-100278
Additional Subjects Toxicology ; Fishes ; Reprints ; Leuresthes tenuis ; Menidia Menidia ; Menidia peninsulae ; Chlorpyrifos ; Carbamate herbicides ; Thiobencarb
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Status
NTIS  PB86-100278 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 11p
Abstract
Sensitivity, expressed as the 96-h LC50 derived from acute lethality tests, was compared for four ages (day-of-hatch, 7-d, 14-d, and 28-d) of three atherinid fishes: Leuresthes tenuis (California grunion), Menidia menidia (Atlantic silverside), and Menidia peninsulae (tidewater silverside). Responses of each age-species combination exposed to the organophosphate insecticide, chlorpyrifos, and the carbamate herbicide, thiobencarb, were compared in both static and flowing seawater toxicity tests. Chlorpyrifos was highly toxic to all atherinids (96-h LC50's ranged from 0.4 to 6.7 micrograms/L); toxicity of thiobencarb was approximately two orders of magnitude lower (LC50 values from 199 to 1405 micrograms/L). Acute lethal responses to each pesticide were similar among the three species. Sensitivity was generally highest for 7-d and 14-d age groups, and flowing-water tests were more sensitive measures of toxicity than static tests, especially for chlorpyrifos.