Effect of Acute Toxicity of Glyphosate in Gold Fish Carassiusauratus

Abstract

The present study deals with the effect of herbicide glyphosate on goldfish Carassiusauratus .Fish were exposed to different concentrations of the mentioned pesticide, the percentages of mortalitywere increasing with the increase of the pesticide concentration. Median lethalconcentration (LC50) of pesticid was calculated after an acute exposure period (96) hours (14.55) ppm. The result showed that theglyphosate was observed mortality in fish during (24) hours in concentration (16, 18) ppm, whereas mortality was not observed during (24) hours in concentration (12,14) ppm. After (24) hours the percentage of mortality was increasing gradually with the increase of exposure time. It is found that the increasing of the concentration of pesticide under study correlated reflexive with (LT50) of these concentrations. The concentration (12) ppm recorded higher LT50 (562) hours , whereas the concentration (18) ppm recorded lower LT50 (33) hours. Behavioral , morphological and histological effects of various concentrations of glyphosate on gold fish Carassiusauratusinthe acute exposure (96) hours were investigated .There were behavioral and morphological changes on the exposed fishes represented by nervous symptoms , loss of equilibrium , increas in respiration rate , opening of mouth and body bend in caudal region(curvature in vertebral column).Histological changes were determined in gills after acute exposed such as hyperplasia , hemorrhage , aneurysms , separation of epithelial layer , clubbing with sickle lamellae , hypertrophy , destroyed and fusion of secondary lamellae.