Chronic toxic effects of the organophosphorus insecticide chlorpyrifos (dursban) on the spawning, reproductive behavior, and early life stages of the cichlid fish tilapia | ||
Journal of Pest Control and Environmental Sciences | ||
Volume 2, Issue 1, 1990, Pages 103-109 PDF (624.53 K) | ||
Document Type: Original Article | ||
DOI: 10.21608/jpces.1990.460680 | ||
Author | ||
Mohamed M. Shereif* | ||
Department of plant protection, faculty of agriculture, University of Ain shams, Egypt | ||
Abstract | ||
The fish Tilapia zillii was exposed to sublethal concentrations of the organophosphorus insecticide chlorpyrifos (Dursban) using the continuous flow-through system to evaluate its chronic toxic effects on spawning, reproductive behavior, and early life stages of the fish. Chlorpyrifos affected spawning and reproductive behavior at concentrations as small as 3.6 ug/1. Also, survival of early life stages of T. zillii was reduced significantly at the concentration of 3.6 ug/L than at 1.7 ug/L of the control. The maximum acceptable toxicant concentration (MATC), or "no effect" level, was estimated to be between 1.7 and 3.6 ug/L and the application factor (AF) was in the range of 0.007 and 0.015, and the chronic value was 2.474 ug/1. | ||
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