Please be patient while sound file is loaded. You may have to increase volume settings.
If you did not hear the sound. Click here to download sound file.
| Sound produced | yes, active sound production |
| Type of sound produced | knocks |
| Sound production organ | pharyngeal teeth & swim bladder |
| Sound mechanism | pharyngeal teeth stridulation augmented by adjacent swim bladder |
| Behavioural context | under duress (manual stimulation) |
| Reference | Fish, M.P. and W.H. Mowbray, 1970 |
| Remark | sound production synchronized with opening of mouth, recorded with bandpass filter: 60 -1200 Hz, some high frequency interference in the background |