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| Sound produced | yes, active sound production |
| Type of sound produced | clucks, clicks, squeak, thumps |
| Sound production organ | swim bladder, pneumatic duct, possibly teeth |
| Sound mechanism | Knocks: vibration of swim bladder & pneumatic duct, possibly by general body contraction, clucking: escape of gas bubbles from pneumatic duct; clicking: possibly teeth, associated with opening of mouth & contraction of gill region |
| Behavioural context | spontanous sounds (noturnal, behav. not specified) |
| Reference | Fish, M.P. and W.H. Mowbray, 1970 |
| Remark | recording in wooden tank, recorded with highpass filter: 100 Hz |