Acoustic target strength characteristics of two species of multiple jellyfishes, aurelia aurita and cyanea nozakii, in the southern coast of Korea SCOPUS KCI

Title
Acoustic target strength characteristics of two species of multiple jellyfishes, aurelia aurita and cyanea nozakii, in the southern coast of Korea
Author(s)
Kang, D.; Kim, J.; Lim, S.
KIOST Author(s)
Kang, Don Hyug(강돈혁)
Publication Year
2010
Abstract
Understanding the abundance and distribution of massive jellyfish is necessary to forecast where or when their blooms will happen. The acoustic technique is one of the most useful methods of obtaining information if the acoustic characteristics of the targets are known. This study was conducted to determine the acoustic target strength (TS, dB) of two jellyfish species, Aurelia aurita and Cyanea nozakii, in the southern coast of Korea. For the ex situ measurements, 120, 200, and 420 kHz split beam transducers were used, and jellyfish with various bell lengths were arranged to prepare multiple jellyfish. Under 2 vertical individuals, the mean TS for multiple A. aurita at 120, 200, and 420 kHz was -72.7, -71.7, and -68.2 dB, respectively. In the case of 5 vertical individuals, the mean TS of the species was -71.3, -68.2, and -62.0 dB. Finally, the mean TS of C. nozakii at 120, 200, and 200 kHz was -62.0, -60.3, and -58.2 dB under 2 individuals and -58.1, -57.4, and -54.0 dB under 4 individuals, respectively. For both species, higher numbers of jellyfish resulted in a higher TS. In addition, higher frequencies were associated with a higher TS for the same jellyfish. These TS results for two species can be used as essential data for the acoustic detection of jellyfish in an open ocean or coastal area.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4163
DOI
10.4217/OPR.2010.32.2.113
Bibliographic Citation
Ocean and Polar Research, v.32, no.2, pp.113 - 122, 2010
Subject
coastal zone; jellyfish; relative abundance; target strength; transducer; Korea; Aurelia aurita; Cyanea nozakii; Scyphozoa
Keywords
Acoustic target strength (TS); Aurelia aurita; Cyanea nozakii; Living multiple jellyfish
Type
Article
Language
Korean
Document Type
Article
Related Researcher
Research Interests

Marine security,Underwater Acoustics,해양방위,수중음향

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