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http://dx.doi.org/10.4217/OPR.2015.37.4.333

Physical Parameter Measurement and Theoretical Target Strength Estimation of Juvenile Cod (Gadus macrocephalus)  

Husni, Iqbal Ali (Department of Fisheries Physics, Graduate School, Pukyong National University)
Hwang, Bo-Kyu (Department of Marine Science and Production, College of Ocean Science and Technology, Kunsan National University)
Shin, Hyeon-Ok (Division of Marine Production System Management, College of Fisheries Science, Pukyong National University)
Kim, Min-Son (Department of Marine Science and Production, College of Ocean Science and Technology, Kunsan National University)
Publication Information
Ocean and Polar Research / v.37, no.4, 2015 , pp. 333-340 More about this Journal
Abstract
The contrast (fish body to medium ratio) of density and sound speed were measured to estimate acoustic scattering from small juvenile cod (Gadus macrocephalus) with the Kirchhoff-Ray Mode backscatter model. The density contrast was measured by the density-bottle method and the sound speed contrast was estimated by the time of flight method. The results revealed that the measured density contrasts of juvenile cod varied between 1.003 and 1.029 (mean = 1.014, S.D. = 0.01). On the other hand, sound speed contrasts varied between 1.039 and 1.041 (mean = 1.041, S.D. = 0.001). The relationship between averaged target strength (TS) and total length (TL) established by the model were <$TS_{38kHz}$> = 20log(TL) - 68.8 and <$TS_{38kHz}$> = 20log(TL) - 69.4, respectively.
Keywords
density contrast; sound speed contrast; target strength; juvenile cod; Kirchhoff-Ray Mode backscatter model;
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