Measurement of the volume-backscattering spectrum from an aggregation of Antarctic krill and inference of their length-frequency distribution

Amakasu, Kazuo; Mukai, T.; Moteki, Masato

doi:10.1016/j.polar.2017.02.007

Cited by 9 publications

(2 citation statements)

References 46 publications

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“…ability to discriminate between different categories of organisms (e.g. Urmy et al (2012)), newer multi-frequency (Brierley et al, 1998;Kloser et al, 2002) and broadband (Amakasu and Mukai, 2017;Lavery et al, 2010;Ross et al, 2013) sonar systems exploit variations in echo intensity with frequency to discriminate categories, sizes and even species of pelagic organisms (McQuinn et al 2013). For ship-borne sonar this quantification becomes increasingly coarse with depth due to beam spreading and acoustic attenuation of the high frequencies needed to study small organisms.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A miniature biomimetic sonar and movement tag to study the biotic environment and predator-prey interactions in aquatic animals

Goulet¹,

Guinet²,

Swift³

et al. 2019

Deep Sea Research Part I: Oceanographic Research Papers

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Section: Accepted Manuscriptmentioning

confidence: 99%

A miniature biomimetic sonar and movement tag to study the biotic environment and predator-prey interactions in aquatic animals

Goulet¹,

Guinet²,

Swift³

et al. 2019

Deep Sea Research Part I: Oceanographic Research Papers

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“…Two frequency comparisons were needed to calculate the differences in MVBS values generated from the backscatter of the same object. The process was done in order to distinguish the effect of frequency variability, which eventually can determine the dominant scatterers [29]. The difference in MVBS values for each ADCP instrument is written as:…”

Section: Mvbs Comparisonmentioning

confidence: 99%

Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration Observation

et al. 2019

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Zooplankton can be detected by using acoustic Doppler current profiler (ADCP) instruments through acquiring the mean volume backscattering strength (MVBS) data. However, the precision of the backscattered signal measured by single ADCP measurement has a limitation in the MVBS variation of zooplankton. The objectives of this study were to analyze the MVBS and vertical velocity from ADCPs at the same time and location for zooplankton’s daily vertical migration (DVM) observation. Measurements were conducted in Lembeh Strait, North Sulawesi, Indonesia. Instruments used included a moored ADCP 750 kHz and a mobile ADCP 307.2 kHz. High MVBS value was found at 11.5–16 m depths and was identified as the sound scattering layer (SSL). The DVM patterns in the SSL displayed significant differences over time and had good relationships with the diurnal cycle. Theoretical target strength (TS) from the scattering models based on a distorted-wave Born approximation (DWBA) was estimated for Oithona sp. and Paracalanus sp.; the two dominant species found in the observed area. However, ΔMVBS and ΔTS proved that the dominant zooplankton species were not the main scatterers. The strong signal in SSL was instead caused by the schools of various zooplankton species.

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A broadband target strength measurement method for weakly scattering animals using a 50-ms-long linear frequency modulated signal in a small tank

et al. 2021

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Measurement of the volume-backscattering spectrum from an aggregation of Antarctic krill and inference of their length-frequency distribution

Cited by 9 publications

References 46 publications

A miniature biomimetic sonar and movement tag to study the biotic environment and predator-prey interactions in aquatic animals

A miniature biomimetic sonar and movement tag to study the biotic environment and predator-prey interactions in aquatic animals

Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration Observation

A broadband target strength measurement method for weakly scattering animals using a 50-ms-long linear frequency modulated signal in a small tank

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