Oreochromis niloticus sound parameters (means ± s.d.) under stimulation with (PJ KO) and without (Stim) the pharyngeal jaws blocked and results of the Mann–Whitney U-test
| Variables . | N fishes . | N pulses Stim . | N pulses PJ KO . | Mean ± s.d. Stim . | Mean ± s.d. PJ KO . | M–W P (<0.05) . |
|---|---|---|---|---|---|---|
| Duration (ms) | 5 | 90 | 90 | 138.2±12 | 139.3±21.2 | NS |
| Frequency (Hz) | 5 | 90 | 90 | 60.1±36 | 42.7±25.9 | *** |
| dB rel. | 5 | 90 | 90 | 33.3±2.2 | 33.2±2.6 | NS |
| Variables . | N fishes . | N pulses Stim . | N pulses PJ KO . | Mean ± s.d. Stim . | Mean ± s.d. PJ KO . | M–W P (<0.05) . |
|---|---|---|---|---|---|---|
| Duration (ms) | 5 | 90 | 90 | 138.2±12 | 139.3±21.2 | NS |
| Frequency (Hz) | 5 | 90 | 90 | 60.1±36 | 42.7±25.9 | *** |
| dB rel. | 5 | 90 | 90 | 33.3±2.2 | 33.2±2.6 | NS |
P>0.05=NS and P<0.001=***