Concentracao SePM (g/L) Gill histopathological index 0 0.75 0 0.94 0 1.06 0 1.19 0 0.75 0 0.75 0.01 1.44 0.01 1.63 0.01 2.00 0.01 2.00 0.01 2.00 0.01 2.00 0.1 3.50 0.1 3.50 0.1 3.38 0.1 3.38 0.1 3.38 0.1 3.38 1 4.63 1 4.63 1 4.69 1 4.63 1 4.38 1 4.38