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|Sound produced||yes, active sound production|
|Type of sound produced||thumps, knocks, escape sounds|
|Sound production organ||swim bladder firmly encased in peritoneum|
|Sound mechanism||vibration by contraction of associated muscles|
|Behavioural context||escape sounds spontaneous, thumps & knocks under duress (handling & electric stimulation)|
|Reference||Fish, M.P. and W.H. Mowbray, 1970|
|Remark||recorded with highpass filter: 75 Hz|