The Journal of Basic and Applied Zoology

Table 2 LC₅₀ of Heteropneustes fossilis

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

Conc. (ppm)	No. of dead fish	Mortality (%)	LC₅₀ (P < 0.05)	χ² value
0.00	0	0	0.151 (0.014–0.198)	15.02
0.00375	0	0
0.0075	0	0
0.015	0	0
0.03	0	0
0.06	6	20
0.12	11	36.7
0.24	19	63.3
0.36	26	86

N = 30

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