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Diets containing corn naturally contaminated with deoxynivalenol reduces the susceptibility of rainbow trout ( Oncorhynchus mykiss) to experimental Flavobacterium psychrophilum infection
Author(s) -
Ryerse Ian A,
Hooft Jamie M,
Bureau Dominique P,
Anthony Hayes M,
Lumsden John S
Publication year - 2016
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12537
Subject(s) - rainbow trout , biology , flavobacterium , zoology , trout , aquaculture , intraperitoneal injection , contamination , fish <actinopterygii> , microbiology and biotechnology , fishery , food science , veterinary medicine , ecology , bacteria , endocrinology , pseudomonas , medicine , genetics
The objective of this study was to determine if deoxynivalenol (DON) exposure alters the susceptibility of rainbow trout to bacterial coldwater disease caused by Flavobacterium psychrophilum . Rainbow trout were fed a nutritionally complete diet containing corn that was naturally contaminated with DON at a desired concentration of <0.5 (control and pair‐fed treatments), 4 or 6 ppm over 7 weeks to apparent satiation. After 4 weeks, fish were infected by intraperitoneal injection with F. psychrophilum (3.03x10 6 CFU mL −1 ) via intraperitoneal injection and monitored for morbidity and mortality. A significant linear reduction in feed intake was associated with increasing dietary levels of DON contamination over the initial 4 weeks. There was a significant reduction ( P < 0.05) in cumulative per cent mortality in DON‐fed groups (4.1 ppm, 11%; 5.9 ppm, 7%) in comparison to control (46%) and pair‐fed (25%) groups at 21 days post infection. Mortality of trout pair‐fed the control diet was also significantly lower ( P < 0.05) than the control group fed to apparent satiation. A replicate trial using genetically similar fish and the same experimental design produced similar results. These results suggest that DON exposure and restricted feed intake provided a protective effect for rainbow trout infected with F. psychrophilum .