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Table 1 Comparison of stage EC50 values of phorate for different embryonic stages of H. elegans (temp. 28 ± 0.2 °C, salinity 34 ± 0.1°/00, pH 8.1 ± 0.1) (stage EC50 values are expressed in ppm)

From: The toxic effects of phorate on early embryonic stages of sedentary polychaete Hydroides elegans (Haswell, 1883)

Developmental stages EC50 values of phorate Developmental stages EC50 values of phorate
FM stage 5.6146 32-cell stage 0.9501
2-cell stage 3.9352 64-cell stage 0.7143
3-cell stage 3.8298 Blastula stage 0.6164
4-cell stage 2.8989 Blastula start
rotation stage
0.3891
8-cell stage 1.3889 Blastula stop
rotation stage
0.3891
16-cell stage 0.9528 Release stage 0.2782