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Immediate effects of acute stress on innate immunity in rainbow trout (Oncorhynchus mykiss)

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dc.contributor.advisor Bayne, Christopher J.
dc.creator Demers, Nora Egan
dc.date.accessioned 2012-10-08T18:11:15Z
dc.date.available 2012-10-08T18:11:15Z
dc.date.copyright 1996-06-11
dc.date.issued 1996-06-11
dc.identifier.uri http://hdl.handle.net/1957/34210
dc.description Graduation date: 1997 en_US
dc.description.abstract This thesis tests the hypothesis that innate immunity may be enhanced immediately following a stressful event. The experiments characterize the acute effects of the fight or flight response on some immunological and endocrine parameters in rainbow trout (Oncorhynchus mykiss). Plasma cortisol and catecholamines were elevated within seconds of the initiation of an acute handling stressor consisting of 30 seconds in the air and five, 10 or 20 minutes in a shallow bucket of water. Plasma lysozyme activity increased after stress, however, the increases were not statistically significant unless variation was reduced by serial bleeding of the same individual trout before and after stress. A more "resting" fish was achieved by use of the anesthetic 2-phenoxy-ethanol which was surreptitiously introduced into the tanks before the initial bleed. Individual fish were then revived in freshwater and stressed as before. Enhancement of lysozyme activity was evident although levels of plasma stress hormones in fish that were anesthetized, revived and stressed were less than when fish were similarly stressed without anesthetic. Levels of cortisol and catecholamines increased within seconds of capture and aerial exposure, returned to near pre-stress levels after the fish had been placed in a shallow bucket of water for 30 seconds, then increased again. Evaluation of the influence of acute stress on survival following challenge with the pathogen Vibrio anguillarum yielded equivocal data. Results presented here suggest that enhancement of innate defenses as part of the fight or flight response merits further evaluation. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Rainbow trout -- Effect of stress on en_US
dc.subject.lcsh Natural immunity -- Effect of stress on en_US
dc.subject.lcsh Rainbow trout -- Immunology en_US
dc.title Immediate effects of acute stress on innate immunity in rainbow trout (Oncorhynchus mykiss) en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Doctor of Philosophy (Ph. D.) in Zoology en_US
dc.degree.level Doctoral en_US
dc.degree.discipline Science en_US
dc.degree.grantor Oregon State University en_US
dc.description.digitization File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. en_US
dc.description.peerreview no en_us

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