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Fumunda acoustic alarms were tested in the absence of nets to determine their ability to modify the behavior of Australian snubfin and humpback dolphins, with possible applications to gillnet fisheries. The alarms emitted a regular interval pulse of 300 ms every 4 seconds at 10 kHz frequency. The behavior of the animals changed slightly when the alarms were used but the likelihood of them leaving the area was not significantly different from the control. This suggests this type of acoustic alarm may not be useful as a bycatch mitigation measure for these species.