Furunculosis in Brook Trout: Infection by Contact Exposure

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Abstract
In juvenile brook trout (Salvelinus fontinalis) challenged by applying about 109 virulent Aeromonas salmonicida cells to an abraded area along the lateral line, or held in aquarium water containing about 105 cells per milliliter, mortalities were 50 and 60%, respectively, within 7 days after exposure. Neither feeding the bacterium to the fish nor applying it directly to the gills caused systemic bacterial infection. Two consistent experimental challenges were developed for inducing furunculosis in juvenile brook trout: (1) 15-min contact (bath) exposures of trout to about 106 A. salmonicida cells per milliliter of spring water, and (2) 60-s dip exposures of the fish to 109 A. salmonicida cells per milliliter. These challenge procedures produced 70-100% and 74-88% mortality, respectively, within 14 days after exposure. Results obtained with a strain of brook trout from Owhi Lake, Washington, by the dip exposure method were affected by neither the age of the fish (up to 1 year) nor the source of th...

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