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|Sound produced||yes, active sound production|
|Type of sound produced||knocks & chewing sounds|
|Sound production organ||pharyngeal teeth & swim bladder in young, mostly swim bladder in old (teeth are numerous in young, but deciduous with age)|
|Sound mechanism||not specified, but probably pharyngeal teeth stridulation amplified by adjacent swim bladder and swim bladder vibration by muscle contraction|
|Behavioural context||under duress (manual & electric stimulation), escape knocks when avoiding hand, chewing sounds during feeding|
|Reference||Fish, M.P. and W.H. Mowbray, 1970|
|Remark||recorded with bandpass filter: 30 -1200 Hz, recording amplified by 6 dB|