Experimental infection of brown trout, Salmo trutta L., using a Finnish Yersinia ruckeri isolate
Identifieur interne : 000981 ( Istex/Corpus ); précédent : 000980; suivant : 000982Experimental infection of brown trout, Salmo trutta L., using a Finnish Yersinia ruckeri isolate
Auteurs : Jaana Hietala ; E. Tellervo Valtonen ; Tuula AaltonenSource :
- Aquaculture [ 0044-8486 ] ; 1995.
Abstract
The pathogenicity of a Finnish Yersinia ruckeri isolate to 1-year-old brown trout was tested using both immersion and injection mode of infection. The occurrence of bacteria and antibody production were monitored for up to 25 days. No disease signs or mortality due to Y. ruckeri occurred in the immersion experiment where the fish were further stressed with Ichthyophthirius multifiliis, but Y. ruckeri was isolated from certain organs in half of the fish. The intestine, kidney and spleen were the most favoured sites of infection, only one fish having bacteria in the liver. The injection of brown trout caused 100% Y. ruckeri infection and some mortality was recorded during the first week post infection. All dead fish exhibited signs of bacterial infection but none had inflammation around the mouth. Antibodies against Y. ruckeri were produced in both the groups subjected to immersion and that subjected to injection but the production was higher in the injected fish. These results confirm earlier findings that the Finnish Y. ruckeri is less pathogenic than, for example, Y. ruckeri in USA, and indicate that more experimental studies are needed to examine the significance of geographical variation of Y. ruckeri strains in terms of their pathogenicity.
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DOI: 10.1016/0044-8486(95)01047-5
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<front><div type="abstract" xml:lang="en">The pathogenicity of a Finnish Yersinia ruckeri isolate to 1-year-old brown trout was tested using both immersion and injection mode of infection. The occurrence of bacteria and antibody production were monitored for up to 25 days. No disease signs or mortality due to Y. ruckeri occurred in the immersion experiment where the fish were further stressed with Ichthyophthirius multifiliis, but Y. ruckeri was isolated from certain organs in half of the fish. The intestine, kidney and spleen were the most favoured sites of infection, only one fish having bacteria in the liver. The injection of brown trout caused 100% Y. ruckeri infection and some mortality was recorded during the first week post infection. All dead fish exhibited signs of bacterial infection but none had inflammation around the mouth. Antibodies against Y. ruckeri were produced in both the groups subjected to immersion and that subjected to injection but the production was higher in the injected fish. These results confirm earlier findings that the Finnish Y. ruckeri is less pathogenic than, for example, Y. ruckeri in USA, and indicate that more experimental studies are needed to examine the significance of geographical variation of Y. ruckeri strains in terms of their pathogenicity.</div>
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<head><ce:title>Experimental infection of brown trout, <ce:italic>Salmo trutta</ce:italic>
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