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| Sound produced | yes, active sound production |
| Type of sound produced | low "unk", thumps, clicks, scrapes & escape sounds |
| Sound production organ | swim bladder, teeth |
| Sound mechanism | no associated swim bladder musculature, probably vibration by general body contraction |
| Behavioural context | startle or duress (handling or electric stimulation) |
| Reference | Fish, M.P. and W.H. Mowbray, 1970 |
| Remark | sound always coincident with suddenly increased activity |