Table 1. Percentage mortality (± SD) of freshwater snails at different developmental stages.

		Concentration (ppm)
Age	Stage	350.0	175.0	87.5	43.75	21.88	Control
1 day	Egg (blastula)	4.9 ±2.12	20.0 ± 2.83	3.2 ± 1.41	6.5 ±0.00	3.2 ± 1.41	0.0
7 days	Egg (hippo)	25.6 ±7.78	0.0 ± 0.0	40.5 ± 6.36	0.0 ± 0.0	47.5 ± 20.50	0.0
<1 week	Juvenile	100.0 ±8.49	97.7 ± 2.12	88.6 ± 3.54	82. 2 ± 2.12	93.3 ± 19.80	0.0
1–2 weeks	Juvenile	50.0 ±1.41	45.0 ± 2.12	25 ± 0.71	20.0 ± 1.41	25 ± 0.71	0.0
5–6 weeks	Adult	70.0 ±0.00	20 ± 0.00	70 ± 0.00	60.0 ± 0.00	50 ± 1.41	0.0