Inderwater noise characteristics of TINRO-Center’s reseach vessels

Underwater noise radiated by two medium-tonnage research vessels of Pacific Fish. Res. Center (TINRO) belonged to the same project «Atlantic-833» (RV TINRO and Professor Kaganovsky) is measured by a calibrated hydrophone system. Tools and methods of the noise measurement and methods of the data processing are described in details. Diagrams of the noise spatial distribution, its amplitude-time and spectral-power parameters are presented and compared with those recommended by ICES for fishery research vessels and with similar parameters of other vessels. The maximum noise level is registered abeam of the vessels; the sound interference is observed at the sea surface in the beam vicinity. The noise spectrum is limited by the frequency 2000 Hz with high power in the band < 500 Hz; the spectral power decreases by 3 dB per octave for the frequencies > 200 Hz. The noise field at the sea surface has a classic «butterfly» shape for the frequency range 600-2000 Hz. The noise in 1/3-octave bands exceeds the level recommended by ICES for research vessels on 20-22 dB for the frequencies < 200 Hz and on 10 dB for the frequencies > 500 Hz, it exceeds the noise of diesel-electric RV Oscar Dyson (USA) on 18-24 dB for the frequencies < 1000 Hz and is similar to noise of factory trawler Prometey (USSR) and RV Miller Freeman (USA) for the frequencies most sensitive for fish. Distance of fish reaction to the sonar noise is determined for mass commercial species: it is the largest among research vessels for cod and pollock but is shorter than that one for RV Miller Freeman for herring (commercial trawler Prometey has the largest distance for all these species). For salmons, the distance of their reaction to sonar noise of TINRO’ vessels does not exceed that one recommended by ICES (20 m).

fish behaviour, avoiding reaction, vessel noise, noise spectrum, hydrophone, underwater acoustic field, sound pressure, noise level, noise field, frequency band, fish stock estimation

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