DAO 109:15-22 (2014)  -  DOI: https://doi.org/10.3354/dao02716

White bass Morone chrysops is less susceptible than its hybrid to experimental infection with Flavobacterium columnare 

S. Adam Fuller*, Bradley D. Farmer, Benjamin H. Beck

US Department of Agriculture, Agricultural Research Service, Harry K. Dupree Stuttgart National Aquaculture Research Center, PO Box 1050, Stuttgart, Arkansas 72160, USA
*Corresponding author:

ABSTRACT: Hybrid striped bass (HSB) and white bass (WB) were evaluated for their susceptibility to Flavobacterium columnare, the causative agent of columnaris disease, in 3 fundamental studies. In the first experiment, we determined whether columnaris disease could be developed by experimental challenge in HSB. This challenge consisted of 3 levels of F. columnare (10, 30, and 60 ml volumes) determined to be 2.25 × 107, 6.75 × 107, and 1.35 × 108 CFU ml-1, respectively. Each treatment group exhibited significantly different survival rates: 0, 3.3, and 13.3% in the 60, 30, and 10 ml groups, respectively. In Expt 2, using the 30 ml dose, both HSB and WB had a 0% survival rate, with WB taking significantly longer to reach 100% mortality. In Expt 3, using the 10 ml dose, no HSB survived, whereas 33% of WB survived (p < 0.0001). Compared to controls, HSB treated with 10 ml showed extensive gill damage at 24 h, which could have contributed to the higher mortality observed in HSB; in contrast, WB gills showed noticeably less damage. From these series of experiments, it is clear that HSB are more sensitive to F. columnare, having lower survival and more extensive histological damage compared to WB following challenge. 


KEY WORDS: Columnaris disease · Hybrid striped bass · Dose response · Differential survival


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Cite this article as: Fuller SA, Farmer BD, Beck BH (2014) White bass Morone chrysops is less susceptible than its hybrid to experimental infection with Flavobacterium columnare . Dis Aquat Org 109:15-22. https://doi.org/10.3354/dao02716

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