the nematode's reproductive system is sexual. female vinegar eels have ovaries and produce eggs. their reproductive system is in the form of a tube. the females also have a short sac-like seminal receptacle that stores sperm. a fertilized egg hatches in the uterus before leaving the womb. vinegar eels give birth to as many as 45 babies every 8-10 days. a male vinegar eels’ reproductive system is smaller than the female’s. they have testis and a vas deferens. the testes open into a wide sperm duct and then into a muscular duct which can push out the sperm. the duct empties into a cloaca.