The Cortisol Levels, Histology, and Fine Structure of Various Tissues of Fish Gambusia affinis (Baird and Girard, 1853) after Exposure to Lead

Table 1

The average concentration of lead (Pb) in water and the gills of Gambusia affinis.

Treatment	Lead in water (mg/L)	Lead in fish gills(mg/kg)
A	0.012 ± 0.001^b	0.023 ± 0.002^b
B	0.020 ± 0.001^c	0.030 ± 0.001^c
Control	0.005 ± 0.003^a	0.008 ± 0.001^a

Lowercase letters indicate statistically significant differences (a<b < c,  < 0.05), measured level of Pb in water (each data from 3 measurements), A = 0.1 mg/L PbCl₂, B = 1 mg/L PbCl₂, Control = without Pb, the sample size is N = 5, with each treatment comprising a composite of two individuals.