Biocontrol of saprolegniosis in silver perch Bidyanus bidyanus (Mitchell) by Aeromonas media strain A199

Elsevier Science Bv
Publication Type:
Journal Article
Aquaculture, 2004, 235 pp. 77 - 88
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The potential of Aeromonas media strain UTS A199 as a candidate for the biocontrol of winter saprolegniosis was tested during a winter outbreak in a farm and in a laboratory challenge trial on silver perch, Bidyanus bidyanus Mitchell. The dialy addition of A199 to tanks during the winter outbreak of saprolegniosis resulted in a significant increase (p<0.05) in fish survival. Close monitoring of fish revealed that A199 treatments halted the progress o the disease by inhibition of hyphal growth within lesions and cyst germination. In a laboratory-based challenge of perch by exposure to highnumbers of cysts and zoospores of Saprolegnia parasitica, the presence of A199 in the tank water delayed the onset of the disease but, ultimately could not protect the fish from the disease under these conditions.
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