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They are hermaphrodites. Refer to shrimp as "it" or i guess he/she. They cannot self fertilize but if you have two - then one or the other will always be gravid with eggs.
the shrimp are indeed hermaphrodites.. they posses both organs but as soon as they molt reproduction can occur. When one molts the other will use the opportunity to mate with it and seeing that every time they lay eggs they molt you see how the cycle goes.. Yes one can be carrying fertilized eggs while the other one is molting and fertilize its eggs giving you two shrimps with eggs.. This will probably be a never ending cycle for your shrimp until there is only one or none of them left.