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http://dx.doi.org/10.5657/KFAS.2016.0856

Comparison of Echogram Analysis Methods for Evaluating the Sound-scattering Layer  

Choi, Seok-Gwan (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science)
Yoon, Eun-A (Department of Fisheries Science, Chonnam National University)
Han, Inwoo (Department of Fisheries Science, Chonnam National University)
Oh, Wooseok (Department of Fisheries Science, Chonnam National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.49, no.6, 2016 , pp. 856-861 More about this Journal
Abstract
This study compared the density of fish determined using three different echogram methods: the frequency-difference, time variable, and threshold modification methods. An acoustic survey was conducted off the coast of Jeju Island after sunset. Data at 38 and 120 kHz frequencies were collected using a commercial fishing vessel. As a reference point, the value of ${\Delta}MVBS_{120-38kHz}$ that distinguished fish from zooplankton using the 38 and 120 kHz frequencies was set at < 2 dB. The estimated density of fish along the survey line was 0.1-30.4, 0.1-64.3, and $0.1-51.7m^2/nmi^2$ using the frequency difference, time variable threshold, and threshold modification methods, respectively. The results of this study constitute basic research for estimating fish densities.
Keywords
Acoustic survey; Frequency difference method; Time variable threshold method; Threshold modification method;
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Times Cited By KSCI : 10  (Citation Analysis)
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