Abstract
Haemorrhagic disease caused by Vibrio alginolyticus is one of the major challenges in marine fish farming, particularly in the intensive cage farming of red drum (Sciaenops ocellatus). Aim of this study was to evaluate the impact of low-frequency ultrasound (20 kHz) on the virulence of V. alginolyticus in the context of haemorrhagic disease in red drum. Experimental results showed that exposure to low-frequency ultrasound in bacterial suspensions for 10, 20, and 30 minutes reduced bacterial density and decreased the activity of several enzymes, including lipase, phospholipase, caseinase, and haemolysin. Furthermore, experimental infection of red drum with V. alginolyticus treated with low-frequency ultrasound for 10, or 20 minutes resulted in a lower mortality rate compared to the control group, where bacteria were not treated with ultrasound.
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