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| Sound produced | yes, active sound production |
| Type of sound produced | knocks |
| Sound production organ | swim bladder & pneumatic duct |
| Sound mechanism | vibrations, possibly some sounds from escape of swim bladder gas through pneumatic duct |
| Behavioural context | under duress |
| Reference | Fish, M.P. and W.H. Mowbray, 1970 |
| Remark | very low sound under duress only, recorded with lowpass filter: 1200 Hz |