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| Sound produced | yes, active sound production |
| Type of sound produced | thumps, knocks, escape sounds |
| Sound production organ | pneumatic duct & swim bladder |
| Sound mechanism | not known but probably vibration of swim bladder & pneumatic duct caused by quick contraction of associated muscles |
| Behavioural context | spontaneous nocturnal sound production |
| Reference | Tiepelt, H., 2005 |
| Remark | outdoor recording late at night (freshwater lake). Sound production by 2 different specimen. 2 sound sequences and some single sounds. Sounds from different individuals were separated by audio technical fade-in and fade-out. Species-specific sounds. Amplified by 4 dB during processing of sound file |