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| Sound produced | yes, active sound production |
| Type of sound produced | booms, thundering rolls, feeding noises |
| Sound production organ | swim bladder & teeth |
| Sound mechanism | vibration of swim bladder by sudden contraction of body musculature, teeth scraping |
| Behavioural context | spontaneous sounds, feeding noises and thundering rolls with mild annoyance |
| Reference | Fish, M.P. and W.H. Mowbray, 1970 |
| Remark | recording amplified by 6 dB |