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| Sound produced | yes, active sound production |
| Type of sound produced | thumps, knocks |
| Sound production organ | swim bladder |
| Sound mechanism | not specified |
| Behavioural context | under duress (feeble knocks & thumps with electric stimulation) |
| Reference | Fish, M.P. and W.H. Mowbray, 1970 |
| Remark | recorded with bandpass filter: 60 -1200 Hz, recording amplified by 6 dB |