| Abstract: | The parasite Ichthyophonus is enzootic in many marine fish populations of the northern Atlantic and Pacific Oceans. Forage fishes are a likely source of infection for higher trophic level predators; however, the processes that maintain Ichthyophonus in forage fish populations (primarily clupeids) are not well understood. Lack of an identified intermediate host has led to the convenient hypothesis that the parasite can be maintained within populations of schooling fishes by waterborne fish-to-fish transmission. To test this hypothesis we established Ichthyophonus infections in Age-1 and young-of-the-year (YOY) Pacific herring Clupea pallasii (Valenciennes) via intraperitoneal (IP) injection and cohabitated these donors with naïve conspecifics (sentinels) in the laboratory. IP injections established infection in 75 to 84% of donor herring, and this exposure led to clinical disease and mortality in the YOY cohort. However, after cohabitation for 113 d no infections were detected in naïve sentinels. These data do not preclude the possibility of fish-to-fish transmission, but they do suggest that other transmission processes are necessary to maintain Ichthyophonus in wild Pacific herring populations. |
| Genre: | Article |
| ProdID: | 70041080 |
| Citation Author: | Gregg, J.L.; Grady, C.A.; Friedman, C.S.; Hershberger, P.K. |
| Citation Contributing Office: | Western Fisheries Research Center |
| Citation Datum: | |
| Citation Day: | 13 |
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| Citation End Page: | 144 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Diseases of Aquatic Organisms |
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| Citation Month: | 6 |
| Citation No Pagination: | |
| Citation Number Of Pages: | 6 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | 6 p. |
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| Citation Public Comments: | |
| Citation Publisher: | Inter-Research |
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| Citation Search Results Text: | Inability to demonstrate fish-to-fish transmission of Ichthyophonus from laboratory infected Pacific herring Clupea pallasii to naïve conspecifics; 2012; Article; Journal; Diseases of Aquatic Organisms; Gregg, J.L.; Grady, C.A.; Friedman, C.S.; Hershberger, P.K. |
| Citation Start Page: | 139 |
| Citation Volume: | 99 |
| Citation Year: | 2012 |
| Type: | citation/reference |
| Text: | Inability to demonstrate fish-to-fish transmission of Ichthyophonus from laboratory infected Pacific herring Clupea pallasii to naïve conspecifics; 2012; Article; Journal; Diseases of Aquatic Organisms; Gregg, J.L.; Grady, C.A.; Friedman, C.S.; Hershberger, P.K. |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.3354/dao02458 |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 27 Nov 2012 00:00 -0600 |
| Publisher: | Inter-Research |
