European eels are both a food source and a predator of organisms in their ecosystem. They are consumed by birds and large predatory fish (Deelder, 1970). European eels also act as a host for the nematode Aguillicola crassus which infects the swim bladders of European eels (Deelder, 1970). European eels distribute nutrients between marine and freshwater ecosystems because they migrate between those habitats (Deelder, 1970).
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