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Parasitic fauna of marine molluscs. Within the phylum mollusca, trematode parthogenetic generations take place (sporocyte and rediae); these molluscs are only the intermediate hosts for these trematode parasites. Development of these stages takes place within the gonad and the digestive gland of the host. This can have devastating results upon the host species because there is a constant battle going on within the host to gain energy and resources and also for the parasite within its habitat (the host) to gain energy and recourses. A consequence of this is the parasite usually wins the battle and the host undergoes histochemical and biochemical changes. These changes can include stunted growth due to only gaining the energy and recourses that are left after the parasite has gained what it requires. Gigantism can also occur in the host whereby it undergoes rapid growth after the host gains much energy and resources after castration, thus...

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