The mating process of Brachionus calyciflorus may be seperated into five phases.There was no significant effect of sex ratio of female to male between 1∶1 and 6∶1 on the percent fertilization,except that the percent fertilizations were all 100% when the sex ratio was 1∶3 and 1∶2.The percentage of mictic females that could be fertilized and males that were capable of fertilization declined with their aging.All mictic females were susceptible to fertilization until age 4h.Susceptibility declined non line...