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1977•ICES Journal of Marine ScienceRequires access

Fish school acoustic target strength

I. E. Davies, R. J. Vent, J. C. Brown

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Abstract

Acoustic target strengths of 10 534 fish schools were measured in the California Current system during 6 cruises from November 1974 to October 1975. Measurements were made with a sidelooking, 30 kHz sonar with a pulse duration of 10 ms; a separate set of 260 schools were measured with a pulse duration of 170 ms. Peak target strength for the 10 ms data set ranged from −20 to +20 dB with a mean of −7·3 dB (s.d. of 5·9 dB); mean intensity target strength was −2·4 dB. For the 170 ms data set, peak target strength ranged from −10 to +23 with a mean of +1·6 dB (s.d. of 5·6 dB); mean intensity target strength was +4·8 dB. Target strength was found to be dependent on pulse length and range (volume sampled)

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Acoustic target strengths of 10 534 fish schools were measured in the California Current system during 6 cruises from November 1974 to October 1975. Measurements were made with a sidelooking, 30 kHz sonar with a pulse duration of 10 ms; a separate set of 260 schools were measured with a pulse duration of 170 ms. Peak target strength for the 10 ms data set ranged from −20 to +20 dB with a mean of −7·3 dB (s.d. of 5·9 dB); mean intensity target strength was −2·4 dB. For the 170 ms data set, peak target strength ranged from −10 to +23 with a mean of +1·6 dB (s.d. of 5·6 dB); mean intensity target strength was +4·8 dB. Target strength was found to be dependent on pulse length and range (volume sampled)

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Available abstract

Acoustic target strengths of 10 534 fish schools were measured in the California Current system during 6 cruises from November 1974 to October 1975. Measurements were made with a sidelooking, 30 kHz sonar with a pulse duration of 10 ms; a separate set of 260 schools were measured with a pulse duration of 170 ms. Peak target strength for the 10 ms data set ranged from −20 to +20 dB with a mean of −7·3 dB (s.d. of 5·9 dB); mean intensity target strength was −2·4 dB. For the 170 ms data set, peak target strength ranged from −10 to +23 with a mean of +1·6 dB (s.d. of 5·6 dB); mean intensity target strength was +4·8 dB. Target strength was found to be dependent on pulse length and range (volume sampled)

Key concepts: Target strength, Intensity (physics), Pulse (music), Fish <Actinopterygii>, Range (aeronautics), Pulse duration, Sonar, Duration (music)

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