Comparison of Distribution and Density of Nemopilema nomurai by Water Columns Using Echo Counting and Echo Integration Methods

Kyoung Yeon Kim, Weol Ae Lim, Jinho Chae, Gunhee Sung, Wooseok Oh and Kyounghoon Lee
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Kyoung Yeon Kim: Climate Change Research Division, National Institute of Fisheries Sciences, Busan 46083, Korea
Weol Ae Lim: Climate Change Research Division, National Institute of Fisheries Sciences, Busan 46083, Korea
Jinho Chae: Marine Environmental Research & Information Laboratory, Gunpo 15850, Korea
Gunhee Sung: Marine Environmental Research & Information Laboratory, Gunpo 15850, Korea
Wooseok Oh: Division of Fisheries Science, Chonnam National University, Yeosu 59626, Korea
Kyounghoon Lee: Division of Fisheries Science, Chonnam National University, Yeosu 59626, Korea

Sustainability, 2020, vol. 12, issue 14, 1-13

Abstract: In this study, the distribution of Nemopilema nomurai in the waters of Mijo-myeon, Namhae and Gijang-gun, Busan was analyzed; furthermore, echo counting and echo integration methods were used to compare the distribution density. The acoustic system used in the study was a split beam scientific echosounder operating at 38 and 120 kHz (EK-60, Simrad, Norway). Echo counting and echo integration methods were used to determine the density of N. nomurai distributed in the survey areas. The distribution of N. nomurai by water columns, estimated using an echo counting method, was concentrated at approximately 10 m deep in the waters of Mijo, Namhae and 10–50 m deep in the waters of Gijang, Busan; moreover, the distributed depth varied by the surveyed date and time. It was shown that analyzing the acoustic scattering strength of jellyfish obtained from the echo counting method would be more effective for distributional survey of N. nomurai with two frequency system.

Keywords: Nemopilema nomurai; acoustic survey; scientific echosounder; echo integration; echo counting (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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