A generalized target strength model for euphausiids, with applications to other zooplankton

1994 ◽  
Vol 95 (5) ◽  
pp. 2452-2466 ◽  
Author(s):  
Michael C. Macaulay
Keyword(s):  
Target Strength ◽  
Strength Model

An in situ target strength model for Atlantic redfish

1998 ◽  
Vol 103 (5) ◽  
pp. 2958-2958 ◽  
Author(s):  
Stephane Gauthier ◽  
George A. Rose
Keyword(s):  
Target Strength ◽  
Strength Model

scholarly journals A distorted wave Born approximation target strength model for Bering Sea euphausiids

2012 ◽  
Vol 70 (1) ◽  
pp. 204-214 ◽  
Author(s):  
Joy N. Smith ◽  
Patrick H. Ressler ◽  
Joseph D. Warren
Keyword(s):  
Bering Sea ◽  
Material Properties ◽  
Born Approximation ◽  
Target Strength ◽  
Model Parameters ◽  
Numerical Density ◽  
Strength Model ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Taper Function

Abstract Smith, J. N., Ressler, P. H., and Warren, J. D. 2013. A distorted wave Born approximation target strength model for Bering Sea euphausiids. – ICES Journal of Marine Science, 70:204–214. Acoustic surveys monitor euphausiid populations in the Bering Sea because of their importance as prey for walleye pollock and other organisms. Various scattering models exist to convert acoustic backscatter data to estimates of euphausiid numerical density or biomass, but a target strength (TS) model specific to Bering Sea euphausiids has not been available. This study parameterized a distorted wave Born approximation (DWBA) scattering model using physical (length and body shape) and material (density contrast, g, and sound speed contrast, h) properties measured from live euphausiids. All model parameters (length, shape, material properties, orientation) were evaluated for their effect on predicted TS. A polynomial function was used to describe animal shape and produced smaller TS estimates compared to a taper function, as is traditionally used in DWBA scattering models of euphausiids. Animal length was positively correlated with TS, but variations in other parameters (including material properties and orientation) also produced large changes in TS. Large differences in TS between estimates calculated using measured versus literature material property values caused large variations in acoustic estimates of euphausiid numerical densities (animals m−3) which emphasizes the importance of collecting site-specific g and h measurements when possible.

Size, peripheral auditory tuning and target strength in noctuid moths

2000 ◽  
Vol 25 (4) ◽  
pp. 346-353 ◽  
Author(s):  
Alex P. Norman ◽  
Gareth Jones
Keyword(s):  
Target Strength

Purpose Strength Model: en busca de un propósito compartido

2019 ◽  
Author(s):  
Núria Chinchilla ◽  
Álvaro Lleo ◽  
Carlos Rey ◽  
Ángel Alloza ◽  
Nuno Pitta
Keyword(s):  
Strength Model

QUANTIFICATION OF TUNA FISH TARGET STRENGTH USING QUANTITATIVE ECHO SOUNDER

2009 ◽  
Vol 1 (1) ◽  
Author(s):  
Henry M. Manik
Keyword(s):  
Wave Reflection ◽  
Fork Length ◽  
Research Programme ◽  
Yellowfin Tuna ◽  
Target Strength ◽  
Bigeye Tuna ◽  
Tuna Fish ◽  
Thunnus Obesus ◽  
The Relationship ◽  
Echo Sounder

A preliminary research programme was carried out in order to study the acoustic wave reflection or target strength (TS) of tuna fish using a quantitative echo sounder (QES). The relationships between TS to fork length (FL) and swimbladder volume, for bigeye tuna (Thunnus obesus) and yellowfin tuna (T. albacares) are investigated. The TS of bigeye tuna was about 3 dB higher than yellowfin tuna when comparing species at the same size. The result can be correlated to the swimbladder volume differencebetween species. The relationship between TS and swimbladder volume was quantified for both species.Keywords: tuna fish, target strength, quantitative echo sounder

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