title: Effects of Anguillicola novaezelandiae on the levels of cortisol and hsp70 in the European eel.
abstract: The nematodes Anguillicola novaezelandiae and Anguillicola crassus are both alien parasites of the European eel with severe adverse effects on their new host. Both species differ in terms of their invasiveness and their severity of harmful effects on the European eel. The purpose of this study was to determine under laboratory conditions whether stages of A. novaezelandiae induce stress in European eels (Anguilla anguilla) and if these levels differ from stress levels induced by A. crassus. We analysed levels of plasma cortisol and hepatic hsp70 of eels experimentally infected with A. novaezelandiae and compared them to uninfected eels as well as to eels experimentally infected with A. crassus. Larval stages of A. novaezelandiae induced higher levels of plasma cortisol compared to uninfected controls, while adult parasites increased the levels of hepatic hsp70 above those of uninfected controls. The eels' cortisol response is induced by larval stages of A. novaezelandiae, while adult stages elevate levels of hepatic hsp70. Levels of stress induced by A. novaezelandiae are comparable to those induced by A. crassus.
authors.affiliation: Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitaetsstrasse 5, 45141, Essen, Germany, kerstin.dangel@uni-due.de.
authors.forename: Kerstin C
authors.initials: KC
authors.lastname: Dangel
authors.forename: M
authors.initials: M
authors.lastname: Keppel
authors.forename: K
authors.initials: K
authors.lastname: Tabujew
authors.forename: B
authors.initials: B
authors.lastname: Sures
mesh_terms: D000811:Anguilla / Q000378:metabolism / Q000469:parasitology*; D000818:Animals; D017176:Dracunculoidea / Q000254:growth & development / Q000502:physiology*; D005393:Fish Diseases / Q000378:metabolism / Q000469:parasitology*; D029941:Fish Proteins / Q000378:metabolism; D018840:HSP70 Heat-Shock Proteins / Q000097:blood*; D006854:Hydrocortisone / Q000097:blood*; D007814:Larva; D008099:Liver / Q000378:metabolism; D017205:Spirurida Infections / Q000378:metabolism / Q000469:parasitology / Q000662:veterinary*; D013312:Stress, Physiological
chemical_list: D029941:Fish Proteins; D018840:HSP70 Heat-Shock Proteins; D006854:Hydrocortisone
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