The researchers studied how a herbicide called glyphosate affects Nile tilapia fish. They exposed the fish to different concentrations of glyphosate for 96 hours and looked at their gill, liver, and kidney tissues. They found that high concentrations of glyphosate caused 100% mortality in the fish. The fish showed changes in their gills, liver, and kidneys, like fused gill structures, abnormal liver cells, and kidney damage. These changes depended on the amount of glyphosate and how long the fish were exposed to it. The study suggests that glyphosate can be harmful to fish, so it's important to be careful when using this herbicide near fish farms or water.