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| Sound produced | yes, active sound production |
| Type of sound produced | grunts |
| Sound production organ | swim bladder devided by constrictions forming a "tympanum" (membranous window), possibly teeth |
| Sound mechanism | vibration by contraction of associated muscles with ribs serving as "drum heads", maybe stridulation of teeth |
| Behavioural context | under duress (captured in nets & mild electric stimulation) |
| Reference | Fish, M.P. and W.H. Mowbray, 1970 |
| Remark | outdoor recording |