Herbicides toxicity to fish: histopathological effects
1997
Poleksic, V. (University of Belgrade, Belgrade - Zemun (Yugoslavia). Faculty of Agriculture) | Karan, V. | Dulic, Z. | Elezovic, I. | Neskovic, N.
In order to investigate the effects of herbicides used for aquatic weed control on fishes, toxicity tests were performed, with subacute concentrations of four herbicides: atrazine, dichlobenil, 2,4-D and glyphosate. Pathomorphological effects on carp gills, liver and kidney were examined. Carp (Cyprinus carpio L.), 51.0-58.0 g in body weight and 13.0-18.2 cm in body length, were used. The concentrations ranged from 10 to 90 percent LC-50, depending on the herbicide tested. The results showed that the herbicides investigated induced changes on carp organs which were not specific for the type of herbicide. Only the severity of gill alterations was strongly related to herbicide concentration for all the herbicide tested, permitting the categorization of gill changes. In the atrazine and dichlobenil test gill changes were related with epithelial hyperplasia, while in the case of 2,4-D and glyphosate, lesions such as subepithelial oedema and lifting of the epithelium in the highest concentration predominated. Effects on liver and kidney structure were found mainly in the highest concentrations. Vacuolation of hepatocytes in the liver, and tubular epithelial cell degeneration in the kidney were the changes commonly recorded, except in the case of glyphosate.
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