Toxic effects of an organophosphate pesticide, envoy 50 SC on the histopathological, hematological, and brain acetylcholinesterase activities in stinging catfish (Heteropneustes fossilis)

The Journal of Basic and Applied Zoology

Table 1 Changes in dissolved oxygen and fish mortality during the experimental period

Pesticide (ppm)	0 day		2 days		5 days		7 days		Mortality (Total)	DO (%) change after 5 days
Pesticide (ppm)	Mortality	DO (ppm)	Mortality	DO (ppm)	Mortality	DO (ppm)	Mortality	DO (ppm)	Mortality (Total)	DO (%) change after 5 days
0.00	0	7.5 ± 1.0	0	7.35 ± 1.0	0	7.25 ± 1.0	0	7.10 ± 1.0	0	3.33
0.00375	0	7.5 ± 1.0	0	7.30 ± 1.0	0	7.15 ± 1.0	0	7.0 ± 1.0	0	4.67
0.0075	0	7.5 ± 1.0	0	7.25 ± 1.0	0	7.15 ± 1.0	0	7.0 ± 1.0	0	4.67
0.015	0	7.5 ± 1.0	0	7.18 ± 1.0	0	7.08 ± 1.0	0	6.94 ± 1.0	0	5.60
0.03	0	7.5 ± 1.0	0	7.13 ± 1.0	0	7.05 ± 1.0	0	6.90 ± 1.0	0	6.0
0.06	0	7.5 ± 1.0	01	7.0 ± 1.0	02	6.95 ± 1.0	03	6.90 ± 1.0	06	7.33
0.12	0	7.5 ± 1.0	01	7.0 ± 1.0	04	6.96 ± 1.0	06	–	11	7.20
0.24	0	7.5 ± 1.0	03	6.93 ± 1.0	07	6.89 ± 1.0	09	–	19	8.13
0.36	0	7.5 ± 1.0	03	6.90 ± 1.0	11	6.85 ± 1.0	12	–	26	8.67