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|Sound produced||yes, active sound production|
|Type of sound produced||grunts, creaks, sobs, yelps|
|Sound production organ||swim bladder, enlarged base of first pectoral spine moved within socket by cleithrum|
|Sound mechanism||vibrations by special "spring appartus" (bony shelf supporting swimbladder dorsally)|
|Behavioural context||under duress (capture or prodding), communication|
|Reference||Fish, M.P. and W.H. Mowbray, 1970|