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


ICES JOURNAL OF MARINE SCIENCE, vol.53, no.2, pp.309-311, 1996 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 53 Issue: 2
  • Publication Date: 1996
  • Doi Number: 10.1006/jmsc.1996.0040
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.309-311
  • Keywords: Black Sea, jellyfish, target strength
  • Dokuz Eylül University Affiliated: No


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