Fertilized eggs you will see them change in color over time. Just before the females have eggs you will notice that their heads contain some orangy (might be different color in some species) gelatinous mass. These are the eggs, which will then be stored at their pleopods. Fertilized eggs will be seen to change in color to a darker hue, mostly light brown and eye spots in the embryos can be seen just before hatching. Some species release the eggs just before they hatch while others hold on to them till they are stimulated to hatch all at the same time. I have worked with a freshwater prawn species, the berried female ate her own eggs somehow when it was just due to hatch in another day or 2. Eating of eggs could be due to broodstock hunger or maybe just a seasonality problem.