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An enhanced humoral immune response against the swimbladder nematode, Anguillicola crassus, in the Japanese eel, Anguilla japonica, compared with the European eel, A. anguilla

Published online by Cambridge University Press:  11 April 2024

M.E. Nielsen*
Affiliation:
Marine Biological Laboratory, University of Copenhagen, 5 Strandpromenaden, DK-3000 Helsingør, Denmark
*
*Address for correspondence: The Royal Veterinary and Agricultural University, Department of Veterinary Microbiology, Section of Fish Diseases, Bü lowsvej 13, DK-1870 Denmark. Fax: +45 35 28 27 11 E-mail: [email protected]
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Abstract

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The humoral immune response in the two eel species, Anguilla japonica and Anguilla anguilla against two fractions of antigens in Anguillicola crassus were studied.Within species, both eel species showed significantly elevated titres compared with controls when immunized with antigens from Anguillicola crassus.In interspecific comparison, Anguilla japonicashowed significantly elevated titres in comparison with Anguilla anguilla. Immunization of Anguilla anguillacaused a significantly decrease in the plasma levels of protein in comparison with control fish and all groups of Anguilla japonica. In contrast, Anguilla japonica showed significantly lower plasma levels of Ig in all groups compared with Anguilla anguilla.The different susceptibilities to Anguillicola crassus between the natural host, Anguilla japonica, and the naı¨ve, Anguilla anguilla, is partly due to differences in the ability of the two eel species to mount a humoral immune response.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1999

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