Table 1.

Mean number of erythrocytic nuclear abnormalities (ENA) in zebrafish exposed to three sub-lethal concentrations (0.8, 1.6 and, 3.2 mg/L, i.e., 10 %, 20 %, and 40 % of LC₅₀, respectively) of fenitrothion and the respective controls at each period of exposure (1, 3 and 7 days) and recovery for similar intervals.

Abnormalities	Dose (% of LC50)	Exposure period		Recovery period	Recovery rate (%)	Exposure period	Recovery period	Recovery rate (%)	Exposure period	Recovery period	Recovery rate (%)
		Control	1 day	1 day		3 day	3 day		7 day	7 day
Micronuclei	10	0.33 ± 0.10 ax	0.48 ± 0.02a	0.40 ± 0.01x	16.66	1.50 ± 0.11b	1.12 ± 0.30y	25.33	4.18 ± 0.22c	1.68 ± 0.13z	59.80
	20		0.68 ± 0.03 a	0.60 ± 0.01 x	11.76	1.71 ± 0.13 b	1.40 ± 0.18 y	18.12	4.84 ± 0.13 c	2.12 ± 0.05z	56.19
	40		0.87 ± 0.12 a	0.74 ± 0.11 x	14.94	1.80 ± 0.20 b	1.50 ± 0.17 y	16.66	5.79 ± 0.21 c	3.21 ± 0.20 z	44.55
Binucleated	10	0.29 ± 0.03 ax	0.51 ± 0.14ab	0.45 ± 0.11 x	11.76	0.33 ± 0.13 a	0.25 ± 0.09y	24..24	0.84 ± 0.02 b	0.55 ± 0.11 x	34.52
	20		0.73 ± 0.05 a	0.64 ± 0.19 x	12.32	0.69 ± 0.21 a	0.57 ± 0.15 x	17.39	1.15 ± 0.13 b	0.78 ± 0.09 x	32.17
	40		0.48 ± 0.14 a	0.44 ± 0.05 x	8.33	0.62 ± 0.16 b	0.50 ± 0.21 x	19.35	1.18 ± 0.14 c	0.82 ± 0.05 y	30.50
Blebbed nuclei	10	0.35 ± 0.11 ax	0.77 ± 0.05 a	0.65 ± 0.14 x	15.58	1.20 ± 0.05 b	0.86 ± 0.07 y	28.33	1.95 ± 0.12 c	1.12 ± 0.09 z	42.56
	20		0.96 ± 0.16 a	0.84 ± 0.13 x	12.50	1.57 ± 0.05 b	1.00 ± 0.06 y	26.75	2.10 ± 0.23 c	1.30 ± 0.11 y	38.09
	40		1.13 ± 0.04 b	1.00 ± 0.11 x	11.50	1.55 ± 0.06 b	1.25 ± 0.10 x	19.35	2.55 ± 0.25 c	1.60 ± 0.20 y	37.25
Notched nuclei	10	0.15 ± 0.05 ax	0.29 ± 0.04 a	0.25 ± 0.08 x	13.79	0.93 ± 0.12 b	0.78 ± 0.20 y	16.12	1.76 ± 0.3 c	0.89 ± 0.18 y	49.43
	20		0.56 ± 0.06 a	0.49 ± 0.09 x	12.50	1.03 ± 0.12 b	0.85 ± 0.13 y	17.47	2.69 ± 0.42 c	1.59 ± 0.10 z	40.08
	40		0.70 ± 0.03 a	0.62 ± 0.16 x	11.42	1.40 ± 0.12 b	1.18 ± 0.36 y	15.71	3.96 ± 1.09 c	2.60 ± 0.10 z	34.34
Nuclear bridge	10	0.18 ± 0.02 ax	0.27 ± 0.08 a	0.22 ± 0.08 x	18.51	1.57 ± 0.08 b	0.98 ± 0.27 y	37.57	1.90 ± 0.07 c	0.90 ± 0.02 y	52.63
	20		0.25 ± 0.02 a	0.21 ± 0.08 x	16.00	1.25 ± 0.12 b	1.00 ± 0.08 y	20.00	2.46 ± 0.27 c	1.50 ± 0.17 z	39.02
	40		0.37 ± 0.11 a	0.33 ± 0.06 x	10.81	1.40 ± 0.14 b	1.06 ± 0.11 y	24.28	3.33 ± 0.19 c	2.21 ± 0.15 z	33.63
Nuclear bud	10	0.10 ± 0. ± 01ax	0.13 ± 0.07 a	0.11 ± 0.06 x	15.38	0.40 ± 0.04ab	0.29 ± 0.06 x	27.50	0.75 ± 0.04 b	0.44 ± 0.05 y	41.33
	20		0.20 ± 0.05 a	0.18 ± 0.06 x	10.00	0.50 ± 0.09ab	0.37 ± 0.14 x	26.00	0.94 ± 0.05 b	0.68 ± 0.08 y	27.65
	40		0.30 ± 0.11 a	0.26 ± 0.01 x	13.33	0.68 ± 0.25 b	0.52 ± 0.13x	23.52	1.00 ± 0.04 c	0.74 ± 0.05 y	26.00

Values with different alphabet superscripts in the same row differ significantly (p < 0.05) between exposure and recovery periods, respectively in ENA cells. All values are expressed as mean±SD.