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Velmurugan B.,Environmental Science and Biotechnology Research Unit | Selvanayagam M.,Environmental Science and Biotechnology Research Unit | Cengiz E.I.,Dicle University | Ugurlu P.,Dicle University
Toxicological and Environmental Chemistry | Year: 2015

The present study was undertaken to assess the toxicity of sublethal concentrations (125, 250, and 375 µg L−1) of chlorpyrifos on Anabas testudineus for 21 days. The morphological changes on the gills, scales, and erythrocytes of A. testudineus were observed using scanning electron microscopy. Gill alterations included highly active mucous cells, epithelial hyperplasia, and fusion of secondary lamellae. The scales showed damaged lepidonts. Oozed out cytoplasmic content and lobopodial projections were observed in the erythrocytes after exposure to chlorpyrifos. © 2015 Taylor & Francis. Source


Babu V.,Environmental Science and Biotechnology Research Unit | Mariadoss S.,Environmental Science and Biotechnology Research Unit | Ipek C.E.,Dicle University | Serbest B.,Dicle University | Ali S.,Dicle University
Environmental Toxicology and Pharmacology | Year: 2014

The present study was undertaken to assess the toxicity of sublethal concentrations (0.015, 0.030 and 0.045. ppm) of cypermethrin on the gills, scales and erythrocytes of Anabas testudineus for 21 days. The morphological changes on the gills, scales and erythrocytes of the A. testudineus were observed using scanning electron microscope (SEM). The SEM studies on all the three treated groups revealed several kinds of gills, scales and erythrocytes alterations and modifications with abnormal morphology. Gill alterations included highly active mucous cells, epithelial hyperplasia, fusion of secondary lamellae and epithelial lifting. The scales showed damaged lepidonts. Abnormal erythrocytes (shrunken cells), oozed out cytoplasmic content and lobopodial projections were observed in the erythrocytes of fish after exposure to cypermethrin. © 2014. Source


Raja V.,Environmental Science and Biotechnology Research Unit | Velmurugan B.,Environmental Science and Biotechnology Research Unit | Selvanayagam M.,Environmental Science and Biotechnology Research Unit | Ambrose T.,Environmental Science and Biotechnology Research Unit
Pollution Research | Year: 2010

Acute toxicity of synthetic pyrethroid fenvalerate in fish common carp Cyprinus caprio investigated in the present study. The static renewal test method of acute toxicity was used. The experiments were repeated 3 times and the 96-h LC50 was determined for the Cyprinus carpio. The data obtained from the acute toxicity test were evaluated using the probit analysis statistical method, developed by USEPA. The 96-h LC50 value for fenvalerate in fish Cyprinus carpio was found to be 3.059 ppb. Fenvalerate was found to be more toxic to the fish Cyprinus carpio. Behavioural changes were studied during the exposure period. Copyright © EM International. Source

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