Asexual reproduction generates offsprings that are genetically identical to that of the parent. Having an offspring genetically identical to the parent does not allow for variation within the Daphnia population. Therefore, all the Daphnia fish will look exactly the same with not much differences between them. So, allowing the Daphnia fishes to reproduce sexually allows for a variety of offsprings. For the fact that, not all the offsprings will be created identical. Furthermore, those offsprings can then, in turn, reproduce sexually again and produce even more diversity within the Daphnia
