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|Sound produced||yes, active sound production|
|Type of sound produced||low "unk", thumps, clicks, scrapes & escape sounds|
|Sound production organ||swim bladder, teeth|
|Sound mechanism||no associated swim bladder musculature, probably vibration by general body contraction|
|Behavioural context||startle or duress (handling or electric stimulation)|
|Reference||Fish, M.P. and W.H. Mowbray, 1970|
|Remark||sound always coincident with suddenly increased activity|