Target strength of the common jellyfish (Aurelia aurita): A preliminary experimental study with a dual-beam acoustic system

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1996-04-01

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Mutlu, E

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An enclosure was designed for experiments estimating the target strength (TS) of the common jellyfish (Aurelia aurita) in the Black Sea. A BioSonics echosounder (Model 102) equipped with 120 and 200 kHz dual-beam transducers was used for the measurements. The average acoustic cross-section for each size class was used in functional regression equations to relate the mean TS (dB) of jellyfish to its disc diameter d (cm) and wet weight W (g). These were found to be as follows: TS = 14.72 log d - 74.63 and TS = 5.71 log W - 69.41 at 120 kHz; TS = 39.65 log d - 104.38 and TS = 14.53 log W - 88.07 at 200 kHz. The TS values were found to fluctuate periodically with time. The results showed a variation of - 54 to - 67 dB at 120 kHz for 15.5 cm diameter individuals, with a period of 7.5 to 10 sec; and a variation of -58 to -68 dB for 11.5 cm individuals at 200 kHz, with a period of 6 to 12.5 sec. (C) 1996 International Council for the Exploration of the Sea

Subject Keywords

Ecology, Aquatic Science, Ecology, Evolution, Behavior and Systematics, Oceanography

URI

https://hdl.handle.net/11511/63633

Journal

ICES JOURNAL OF MARINE SCIENCE

DOI

https://doi.org/10.1006/jmsc.1996.0040

Collections

Graduate School of Marine Sciences, Article

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Citation Formats

E. Mutlu, “Target strength of the common jellyfish (Aurelia aurita): A preliminary experimental study with a dual-beam acoustic system,” ICES JOURNAL OF MARINE SCIENCE, pp. 309–311, 1996, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/63633.