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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on May 13, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(6):1233-1237; doi:10.1093/icesjms/fsp126
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

This article appears in the following ICES Journal of Marine Science issue: The Ecosystem Approach with Fisheries Acoustics and Complementary Technologies [View the issue table of contents]

The acoustic characteristics of three jellyfish species: Nemopilema nomurai, Cyanea nozakii, and Aurelia aurita

Miyuki Hirose1, Tohru Mukai2, Doojin Hwang3 and Kohji Iida2

1 Japan Sea National Fisheries Research Institute, Niigata, Japan
2 Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan
3 College of Fisheries and Ocean Science, Chonnam National University, Yeosu, Korea

Correspondence to M. Hirose: Present address: College of Fisheries and Ocean Science, Chonnam National University, Yeosu, Korea. tel: +82 61 659 3123; fax: +82 61 621 3129; e-mail: hirose{at}jnu.ac.kr.

Hirose, M., Mukai, T., Hwang, D., and Iida, K. 2009. The acoustic characteristics of three jellyfish species: Nemopilema nomurai, Cyanea nozakii, and Aurelia aurita. – ICES Journal of Marine Science, 66: 1233–1237.

Reports about jellyfish damaging nets and reducing fish catches are increasing, and data on the abundance and distribution of various jellyfish species are needed to forecast where and when their blooms will happen. Acoustic techniques can be used to obtain this information if the acoustic characteristics of the targets are known. This is a study of acoustic scattering from three jellyfish species: Nemopilema nomurai (order Rhizostomeae), Cyanea nozakii (Semaeostomeae), and Aurelia aurita (Semaeostomeae). Target strength (TS) at 38, 120, and 200 kHz, specific density, and sound speed were measured with live specimens. Specific densities were measured using the displacement–volume–weight and the dual-density methods. The sound speeds were estimated using the time-of-flight method. The reduced TS (RTS), i.e. the TS normalized by bell area, was smaller for N. nomurai (bell diameter range 19–38 cm) than for C. nozakii (bell diameter range 30–40 cm), and the differences in RTS between the species were 17.8, 12.6, and 5.8 dB at 38, 120, and 200 kHz, respectively. The respective sound-speed contrast h and density contrast g were 1.0008 ± 0.009 (mean ± s.d.) and 1.004 ± 0.015 for N. nomurai; 1.038 and 1.073 for one C. nozakii; and 1.0001 ± 0.025 and 0.989 ± 0.019 for A. aurita.

Keywords: acoustic scattering, jellyfish, sound speed, specific density, target strength

Received 8 August 2008; accepted 17 February 2009; advance access publication 13 May 2009.


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