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The Effect of Disinfection Strategies on Transmission of Aeromonas salmonicida and Yersinia ruckeri in a Recirculating Aquaculture System

Authors:

G.L. Bullock ,

The Conservation Fund Freshwater Institute 1098 Turner Road, Speherdstown, WV 25443 USA
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W.B. Schill

U.S. Geological Service, National Fish Health Research Laboratory, 11649 Leetown Road Kearneysville, WV 25430 USA
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Abstract

Continuous addition of Aeromonas salmonicida (which causes furunculosis) or Yersinia ruckeri (which causes enteric redmouth disease, or ERM) broth cultures to recirculating aquaculture systems, without fish, resulted in the presence of these pathogens in the fluidized sand biofilters. Disinfection of the recirculating systems, except biofilters, with 200 ppm sodium hypochlorite and flushing biofilters for 24 hours with spring water did not prevent outbreaks of furunculosis or enteric redmouth disease after stocking Arctic char (Salvelinus alpinus) or rainbow trout (Oncorhynchus mykiss), respectively. Disinfection of the entire recirculating systems with 10 ppm Chloramine-T following outbreaks of furunculosis or ERM, or after addition of broth cultures prevented transmission of enteric redmouth in three trials and in two of three trials with furunculosis. Within 75 days of stocking Atlantic salmon (Salmo salar) with subclinical furunculosis in the recirculating system with rainbow trout, A. salmonicida could be cultured from the mucus of rainbow trout and from the fluidized sand biofilters. Removal of salmon and trout and disinfection of the recirculating system with 10 ppm Chloramine-T prevented a furunculosis outbreak when Arctic char were stocked into the system. However, if the recirculating system was only drained and refilled after removal of salmon and trout, furunculosis occurred within seven days of stocking char.
How to Cite: Bullock, G.L. and Schill, W.B., 2006. The Effect of Disinfection Strategies on Transmission of Aeromonas salmonicida and Yersinia ruckeri in a Recirculating Aquaculture System. International Journal of Recirculating Aquaculture, 7. DOI: http://doi.org/10.21061/ijra.v7i1.1407
Published on 01 Jun 2006.
Peer Reviewed

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