Abstract
AbstractAmbient noise time series measurements were recorded in the shallow water of Northwest Bay of Bengal. A few data sets revealed the presence of impact pile-driving noise. The site is also known for the presence of the speciesTerapon theraps(Family:Terapontidae), and the fish chorus was recorded during the measurement period. Sound metrics of impact pile-driving noise were calculated to assess their potential impacts on fish chorus. Averaged peak sound pressure level reached 162 dB re 1 μPa, and single-strike sound exposure level is about 134 dB re 1 μPa2s, leading to a cumulative sound exposure level of approximately 148 dB re 1 μPa2s. The impact pile-driving signal has the highest energy in lower frequency band over 0.05‐1 kHz. It is observed thatT. therapsfish chorus also displays their pulse repetition rate and swimbladder spectral peaks at lower frequencies. Detailed analysis of the entire data sets indicates that the fishes were exposed to the pile-driving noise, which would have an impact on the chorus made by them.
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