| Popis: |
Nowadays, glyphosate, and its commercial formulation (Roundup 41% SL, Bayer AG, Leverkusen, Germania), is the most widely used broad-spectrum herbicide in industrial agriculture for weed control. The massive use of this substance also affects aquatic ecosystems and water organisms around the world. The potential toxic effects of glyphosate on aquatic specimens should worry us. Indeed, animals such as grass carp are part of the human food chain, so exposure to glyphosate may cause environmental damage and harm human health. In this study, the effect of acute 96h exposure of the commercial formulation of glyphosate (Roundup) on blood biochemical indices of grass carp (Ctenopharhyngoden idella) was evaluated. Three different concentrations of glyphosate were chosen for exposure to three groups of 21 animals each. The lowest was 50mg.L-1, the intermediate concentration was 100mg.L-1, and the highest concentration was 150mg.L-1. The toxicity of the pollutant was tested using lethal concentrations and determining the LC50 (lethal concentrations for 50% of fish). Histopathological damage to the gills and liver was also evaluated, as well as the survival rate of the fish. Results showed severe gill and liver damage, with necrosis, leukocyte infiltration, hyperplasia and hypertrophy, in the group exposed to the highest concentration of glyphosate (150 mg.L-1). Many biochemical changes were also observed, confirming the toxicity hypothesized at the start of the study. |
