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Aquaculture Environment Interactions

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AEI - Vol. 2 - Feature article
Wild and farmed cod were sampled at Øksfjord, Norway. Insets: ectoparasites Trichodina sp. (left) and Caligus sp. (right). Photos: Erik Sterud, Ken MacKenzie

Heuch PA, Jansen PA, Hansen H, Sterud E, MacKenzie K, Haugen P, Hemmingson W


Parasite faunas of farmed cod and adjacent wild cod populations in Norway: a comparison


Atlantic cod Gadus morhua is host to >120 species of protozoan and metazoan parasites. Heuch and co-authors investigated parasite interactions between farmed and wild cod from 4 locations in Norway. A total of 48 parasite taxa were recorded from 343 cod. Transmission between wild and farmed cod is most likely in the case of ectoparasites with direct single-host life cycles, and a few such species were identified; the monogenean Gyrodactylus marinus and ciliate protozoans Trichodina spp. are expected to be the most problematic in the mariculture of cold-water marine fishes. Two parasitic copepods that have been widely predicted to pose serious threats to cod farming, Caligus spp. and Lernaeocera branchialis, were rarely found on farmed cod.


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