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| Sound produced | yes, active sound production |
| Type of sound produced | grunts |
| Sound production organ | swim bladder |
| Sound mechanism | vibration by contraction of associated axial muscles |
| Behavioural context | under duress (handling or mild electric stimulation) |
| Reference | Fish, M.P. and W.H. Mowbray, 1970 |
| Remark | sound production easily induced, recorded with lowpass filter: 1200 Hz |