To examine the acoustic world of fish and gain understanding about the potential effects of anthropogenic noise, both outdoor and indoor experiments are employed (e.g. As anthropogenic sounds can be loud and propagate well through water, there is a growing concern about potentially detrimental effects and an increasing awareness about a general gap in fundamental insights about the acoustic world of fish (Williams et al., 2015 Kunc et al., 2016). There is also often high structural similarity with biologically relevant sounds and large spectral overlap with the auditory sensitivity of fish. The acoustic characteristics of human activities are typically broadband, more or less temporally structured, and biased towards relatively low frequencies. As all fish are capable of detecting sound, acoustic signals and environmental cues play an important role for many fish species in the context of reproduction, orientation and predator-prey interactions (Popper and Hastings, 2009 Slabbekoorn et al., 2010 Radford et al., 2014). Ship traffic, wind turbines, pile driving, and seismic exploration now represent significant components of underwater soundscapes worldwide (Andrew et al., 2002 Hildebrand, 2009). The data and experimental setup provided here may serve a basis to further explore the acoustic world of fish in complex environments and may contribute to the study of potential welfare and conservation issues related to anthropogenic noise. There was a negative correlation, however, between the tendency to freeze and the particle velocity level. We found no correlation between the intensity, quality, or directionality of the behavioural response and the sound pressure or the directivity and ellipticity of particle motion. We also tested 2) whether the acoustic response tendency of adult zebrafish ( Danio rerio) was correlated to the sound field conditions at their position at the moment of sound on-set. We confirmed that the ratio of pressure and particle motion deviated considerably from what would be expected in theoretical far field environments. Here we measured 1) spatial variation in artificially elevated sound levels in a small fish tank for both particle motion and sound pressure. Underwater sound fields can be complex, both in open water and small tank environments.
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