NematodesMany species of nematodes are known to occur worldwide and some species of marine fish act as secondary hosts. Among the nematodes of most concern are Anisakis spp., Capillaria spp., Gnathostoma spp. and Pseudoteranova spp., which can be found in the liver, belly cavity and flesh of marine fish. An example of a nematode causing disease in human beings is Anisakis simplex; the infective stage of the parasite is killed by heating (60 °C for one minute) and by freezing (-20 °C for 24 hours) of the fish core.
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