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Acoustic barriers as an acoustic deterrent for native potamodromous migratory fish species

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Academic year: 2019

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FIGURE 1 Test stimuli included (a) A 140 Hz tone pulse with 3 ms ramps and (b) A sweep-up stimulus, consisting of sine sweeps ranging up to 2 kHz (only 0.5 s are represented)
FIGURE 2 (a) Lateral and (b) top views of the trial tank, depicting different video registration areas: 1, water entrance; 2, speaker; 3, channel [Ch] 1 registration area; 4, channel 2 registration area; 5, channel 3 registration area; 6, water exit
TABLE 1 Relative efficiency (%) of acoustic treatments in Salmo trutta, Pseudochondrostoma duriense and Luciobarbus bocagei
FIGURE 4 The number (mean  S . D .) of (a) Salmo trutta, (b) Pseudochondrostoma duriense and (c) Luciobarbus bocagei observed in the three registration areas (channel (Ch)1, channel 2 and channel 3) of the experimental tank in the first 5 min experimental
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