Target Strength of a Single Fish

Diercks, K. J.; Goldsberry, T. G.

doi:10.1121/1.1912144

Cited by 6 publications

(4 citation statements)

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“…Studies include measurement of target strengths in situ and ex situ, with multiple and single targets. In situ measurements are conducted in the natural environment yet present the challenge of unknown target size, orientation and position relative to the acoustic beam; ex situ measurements, however, provide greater control over these factors (Foote, 1997) Ex situ measurements of tethered fish (similar to the method presented in Chapter 3 of this thesis) include those conducted by Jones and Pearce (1958), Haslett (1969Haslett ( , 1977, Diercks and Goldsberry (1970), Love (1969, 1970, 1971), and Nakken and Olson (1977. In spite of the fact that these measurements were performed at a limited number of angles of orientation (mostly dorsal), they were performed on a variety of species of different sizes and at a number…”

Section: Acoustic Measurements Of Fishmentioning

confidence: 99%

“…In situ measurements present the challenge of unknown target size, orientation and sometimes position relative to the acoustic beam, while ex situ measurements provide greater control over these factors, although in an unnatural environment (Foote, 1997). Ex situ measurements of tethered fish include those conducted by Jones and Pearce (1958), Diercks and Goldsberry (1970), Haslett (1969), Love (1969Love ( , 1970Love ( , 1971, Nakken and Olson (1977), Miyanohana et al (1990), and Benoit-Bird and Au (2001). Although most of these measurements were performed at single frequencies and at a limited number of angles of orientation (mostly dorsal), they were performed on a variety of species of different sizes and demonstrate complicated variabilty that is dependent upon morphology, orientation and acoustic wavelength.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic scattering by axisymmetric finite-length bodies with application to fish : measurement and modeling

Reeder¹

2002

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This thesis investigates the complexities of acoustic scattering by finite bodies in general and by fish in particular through the development of an advanced acoustic scattering model and detailed laboratory acoustic measurements. A general acoustic scattering model is developed that is accurate and numerically effcient for a wide range of frequencies, angles of orientation, irregular axisymmetric shapes and boundary conditions. The model presented is an extension of a two-dimensional conformal mapping approach to scattering by irregular, finite-length bodies of revolution. An extensive series of broadband acoustic backscattering measurements has been conducted involving alewife fish (Alosa pseudoharengus), which are morphologically similar to the Atlantic herring (Clupea harengus). A greater-than-octave bandwidth (40-95 kHz), shaped, linearly swept, frequency modulated signal was used to insonify live, adult alewife that were tethered while being rotated in 1-degree increments over all angles of orientation in two planes of rotation (lateral and dorsal/ventral). Spectral analysis correlates frequency dependencies to morphology and orientation. Pulse compression processing temporally resolves multiple returns from each individual which show good correlation with size and orientation, and demonstrate that there exists more than one significant scattering feature in the animaL. Imaging technologies used to exactly measure the morphology of the scattering features of fish include very highresolution Phase Contrast X-rays (PCX) and Computerized Tomography (CT) scans, which are used for morphological evaluation and incorporation into the scattering modeL. Studies such as this one, which combine scattering models with high-resolution morphological information and high-quality laboratory data, are crucial to the quantitative use of acoustics in the ocean.

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Section: Acoustic Measurements Of Fishmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acoustic scattering by axisymmetric finite-length bodies with application to fish : measurement and modeling

Reeder¹

2002

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“…Fish target strength (TS) determination is the basis for acoustical fish size estimation in acoustical 5 fisheries stock assessment. [1,2,3,4]. The TS of a scatterer is defined as the logarithmic expression of the ratio of the backscattered wave intensity at 1 m M a n u s c r i p t to the incident wave and it is evaluated in fisheries acoustics from the single echo envelope characteristics recorded with calibrated scientific echosounders.…”

Section: Introductionmentioning

confidence: 99%

Monitoring fish weight using pulse-echo waveform metrics

Soliveres

Poveda-Martínez

Estruch

et al. 2017

Aquacultural Engineering

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Please cite this article as: E. Soliveres, P. Poveda, V.D. Estruch, I. Pérez-Arjona, V. Puig, P. Ordó nez, J. Ramis, V. Espinosa, Monitoring fish weight using pulse-echo waveform metrics, (2017), http://dx.Abstract Fish anatomical vertical dimensions are extracted from a time-of-flight analysis of fish echo shape using narrow-bandwidth echosounding of swimming individuals. These vertical dimensions fit a Gumbel distribution model and are successfully correlated with fish weight. The proposed method can be used to estimate the mean weight of fish in aquaculture cages as an alternative to target strength measurements. Full-waveform acquisition and signal correlation techniques permitted to increase the signal-to-noise ratio and to improve the performance against traditional envelope-based echosounding.

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“…Ex situ measurements of tethered fish include those conducted by Jones and Pearce (1958), Haslett (1969), Diercks and Goldsberry (1970), Love (1969Love ( , 1970Love ( , 1971, Nakken and Olson (1977), Miyanohana et al (1990), and Benoit-Bird and Au (2001). Although most of these measurements were performed at single frequencies and at a limited number of angles of orientation (mostly dorsal), they were performed on a variety of species of different sizes and demonstrate complicated variability that is dependent upon morphology, orientation and acoustic wavelength.…”

Section: Introductionmentioning

confidence: 99%