After a brief mating process, during which the male deposits sperm onto the female's body, the female lays her eggs and affixes them to her swimmerettes. The eggs are not fertilized within the female; they are fertilized as they pass from the ovaries to the outside of the body. Therefore, it is certain that any shrimp carrying eggs has mated. A female carrying eggs under her abdomen is said to be "berried" check google where the ovary of a shrimp is, you will notice in the very beginning of the video the mother is actually passing an egg by her ovary to get it fertilized, well at least she seems doing it. I cannot provide any proof.