The frequency of hatching was significantly reduced at the 100Gy irradiation of males compared to controls, with only nine neonates hatching from 15 females mated with irradiated males compared with 918 neonates produced from the crossing of females with non-irradiated males (Table 3). Moreover, no neonates hatched with the ≥ 150Gy doses and no eggs developed to the prehatch stage with ≥ 200 Gy doses.