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Journal of Helminthology Journal of Helminthology

Article contents

Increased susceptibility of Atlantic salmon Salmo salar to infections with Gyrodactylus derjavini induced by dexamethasone bath treatment

Published online by Cambridge University Press:  22 February 2007

C.V. Nielsen  and
K. Buchmann
C.V. Nielsen*
Affiliation:
Department of Veterinary Microbiology, Section of Fish Diseases, Royal Veterinary and Agricultural University, Stigbøjlen 4, DK-1870, Frederiksberg C, Denmark
K. Buchmann
Affiliation:
Department of Veterinary Microbiology, Section of Fish Diseases, Royal Veterinary and Agricultural University, Stigbøjlen 4, DK-1870, Frederiksberg C, Denmark
*
*Author for correspondence Fax: +45 35 28 27 11 Email: cvn@kvl.dk
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Abstract

Dexamethasone, a known immunosuppressant, was administered by bath or injection to Atlantic salmon Salmo salar (Conon stock) to study if this treatment could affect the susceptibility of fish to infections with a Danish strain of Gyrodactylus derjavini (Monogenea). Three groups of S. salar (Conon stock) were immersion treated either with 10, 60 or 240 μg dexamethasone l-1 water, respectively. In addition, one group (positive control) was treated intraperitoneally with 200 μg dexamethasone per fish and one negative control group was kept untreated. A single G. derjavini parasite was placed on the anal fin of each fish and the infection was subsequently monitored weekly for 6 weeks. An increase in parasite populations on the salmon was positively correlated with the amount of immunosuppressant used. Infection levels in the group immersion treated with dexamethasone (240 μg l-1 water) and in the i.p. treated positive control group were significantly higher compared to the untreated control group.

Type
Review Article
Information
Journal of Helminthology , Volume 77 , Issue 1 , March 2003 , pp. 65 - 68
Copyright
Cambridge University Press 2003

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