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JOURNAL OF PLANKTON RESEARCH | VOLUME 25 | NUMBER 11 | PAGES 1307-1318 | 2003
© Oxford University Press; all rights reserved

An evaluation of acoustic and video methods to estimate the abundance and vertical distribution of jellyfish

Ulf Båmstedt1,2,*, Stein Kaartvedt3 and Marsh Youngbluth4

1 Department of Fisheries and Marine Biology, University of Bergen, PO Box 7800, N-5020 Bergen, Norway, 2 Umeå Marine Science Centre, Norrbyn, SE-910 20 Hörnefors, Sweden, 3 Department of Biology, University of Oslo, Blindern, Oslo, Norway and 4 Harbor Branch Oceanographic Institution, 5600 US 1 North, Fort Pierce, FL 34946, USA

* Corresponding Author: ulf.bamstedt{at}ifm.uib.no

Four non-invasive methods (three acoustic and one video) were compared to estimate the abundance and vertical distribution of scyphomedusae, using the locally abundant coronate species Periphylla periphylla in Lurefjorden, north of Bergen, Norway, as the test organism. The acoustic methods included single-target quantification by, respectively, a hull-mounted 38 kHz split-beam echo sounder and a 675 kHz scanning sonar mounted on a remotely operated vehicle (ROV). Data from acoustic backscattering provided estimates of abundance and changes in the vertical position of scattering (= aggregation) layers. Vertical migration was also studied by acoustic target tracking, following single individuals as they ascended in the afternoon. The ROV-mounted scanning sonar missed an unidentified part in the lower size distribution of the target population. Vertical video profiles, conducted during ROV dives, provided the most detailed information on abundance and distribution, although uncertainties remained regarding the size distribution in the population.


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T. A. Sornes, D. L. Aksnes, U. Bamstedt, and M. J. Youngbluth
Causes for mass occurrences of the jellyfish Periphylla periphylla: a hypothesis that involves optically conditioned retention
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