The Broad Fish Tapeworm is also known as Diphyllobothrium latum. Adult Broad Fish Tapeworms are hermaphrodites, and are capable of self-fertilization. Some animals in this species are even known to have developed a second set of reproductive organs. Adults living in mammals produce eggs in the mammal's intestines, which exit through the mammal's feces.
This picture shows the process of a tapeworm traveling through different organisms.