Environmental Science and Biotechnology Research Unit

Chennai, India

Environmental Science and Biotechnology Research Unit

Chennai, India
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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.


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.


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.


PubMed | Environmental Science and Biotechnology Research Unit
Type: Journal Article | Journal: Environmental technology | Year: 2010

Gill, liver and kidney of Clarias gariepinus were examined histologically after exposure to sublethal concentrations (10.05, 20.10 and 30.15 microg/L) of cypermethrin for 10 days. Histological recovery was also studied by maintaining the pesticide-exposed fish in a fresh water system for an additional 10 days. Epithelial hypertrophy and hyperplasia, epithelial lifting, oedema, fusion of secondary lamellae, necrosis and desquamation were histopathological changes in the gills of fish exposed to cypermethrin. Hepatic lesions in the liver tissues of fish were characterized by cloudy swelling of hepatocytes, lipoid vacuoles, pycnotic nuclei and focal necrosis. Epithelial hypertrophy, narrowing of the tubular lumen, atrophy of the glomerulus, broader Bowmans capsule, necrosis in the epithelial cells and pycnosis in the hematopoietic tissue were observed in kidney tissues of fish. These lesions grew with increasing concentration. Although some of the changes were reversible, the rest were less pronounced after a recovery period; a period of 10 days was not long enough for complete recovery.


PubMed | Environmental Science and Biotechnology Research Unit
Type: Journal Article | Journal: Environmental toxicology and pharmacology | Year: 2011

The histopathology of lambda-cyhalothrin, a synthetic pyrethroid pesticide, on the gill, liver, intestine and kidney tissues in fish, mrigal (Cirrhinus mrigala), which is one of Indian major carp species were determined by light microscopy. The fish were experimentally exposed to sub-lethal concentrations (0.3ppb and 0.6ppb) of lambda-cyhalothrin for 10 days. Tissues were normal in the control group. Epithelial hyperplasia, aneurism, epithelial necrosis, desquamation, epithelial lifting, oedema, shortening of secondary lamellae and lamellar fusion were observed in gill tissues exposed to lambda-cyhalothrin. Necrosis of tubular epithelium, cloudy swelling of epithelial cells of renal tubules, narrowing of the tubular lumen, contraction of the glomerulus and expansion of space inside the Bowmans capsule were observed in the kidney tissues of fish after exposure. Hepatic lesions in fish exposed to lambda-cyhalothrin were characterized by hypertrophy of hepatocytes, cloudy degeneration, congestion, karyolysis, karyohexis, dilatation of sinusoids and focal necrosis. The intestinal lesions included infiltration of eosinophils into the lamina propria and atrophy of epithelial cells. The present study proves its toxic potential in terms of the damages induced by lambda-cyhalothrin in organ level. In natural condition lambda-cyhalothrin will be less than the present study, but continuous usage of the pesticide might lead to the concentration that was used in the experimental condition.

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