National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The present study aimed to assess the acute toxicity effects of herbicide, glyphosate on Nile tilapia (Oreochromis niloticus). The bioassay experiments were performed in a static renewal regime with Oreochromis niloticus exposing to varying acute toxicity concentrations of glyphosate viz., 15.33, 30.67, 61.34, 122.68 and 245.36 mg/l for 96 hrs and the gill, liver and kidney tissues were dissected out. The standard histology protocol was followed to study the histological alterations. In the present study, 100 % mortality was observed in concentrations of 122.68 and 245.36 mg/l of glyphosate. The LC50 was determined to be 49.22 mg/l after 96 hrs of exposure. The histological alterations like lamellar fusion, hyperplasia and degenerated secondary lamellae were observed in the gill of fish exposed to glyphosate. Similarly, irregular nucleus, melanomacrophage formation and vacuole formation were observed in the liver of fish treated at different concentrations of glyphosate. The histological alterations like dilation of Bowman's space, glomerular shrinkage and disappearance of the shape of glomerulus was observed in the kidney exposed to glyphosate. The intensity of the histological alterations in gill, liver and kidney was found to depend on the concentration of the toxicant and duration of exposure. The histological alteration observed in the present toxicity study suggests that glyphosate can be a potential toxicant and hence the responsible use of the particular herbicide near the fish farm or in the area close to the aquatic environment should be practiced.
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