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Linking Stress to Increased Mortality of Channel Catfish at Varying Concentrations of Edwardsiella ictaluri

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Author(s): Todd D. Sink | J. Strange Richard | G. Kattesh Henry | G. Mathew Alan

Journal: Journal of Animal and Veterinary Advances
ISSN 1680-5593

Volume: 5;
Issue: 3;
Start page: 208;
Date: 2006;
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Keywords: Stress | Edwardsiella ictaluri | disease | cortisol | challenge

ABSTRACT
This study examined the effects of stress and pathogen concentration on ESC susceptibility in juvenile catfish. Three stress/disease challenges were conducted at concentrations of 1.4, 0.7 and 0.4 Log colony forming units/L of Edwardsiella ictaluri. Twenty-five fingerling catfish per tank were confined to plastic nets for 30 or 60 min, while unstressed fish remained free swimming. Blood samples were taken for cortisol analysis and the pathogen was administered at the conclusion of the stress period. Mortalities were monitored for 21 d. Cortisol concentrations differed (p
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