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The new fisheries multibeam echosounder ME70: description and expected contribution to fisheries research

Published on May 1, 2008in Ices Journal of Marine Science3.367
· DOI :10.1093/icesjms/fsn051
Verena M. Trenkel26
Estimated H-index: 26
('IFREMER': IFREMER),
Valérie Mazauric5
Estimated H-index: 5
('IFREMER': IFREMER),
Laurent Berger10
Estimated H-index: 10
('IFREMER': IFREMER)
Abstract
Recently, Simrad in collaboration with Ifremer developed a calibrated, multibeam, vertical echosounder (ME70) for fisheries research. We describe its capabilities and technical limitations. The ME70 has up to 45 beams with distinct frequencies in the range 70–120 kHz, spanning at most 150°. All beams are stabilized in vessel roll and pitch. It has reduced side-lobe levels, up to –70 dB (twoway) instead of the –25 dB (one-way) of conventional systems. We outline research areas for which the ME70 might provide new types of information and hence lead to novel insights. We illustrate the potential contributions with datasets collected in the English Channel and on the continental-shelf break of the Bay of Biscay. Finally, future research and developments using the new system are outlined.
  • References (51)
  • Citations (71)
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References51
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Acoustic surveys are used to estimate the abundance and distribution of many fish species, and have been based traditionally on data collected at a single acoustic frequency. Although it has been known for some time that the use of additional frequencies can provide information on the nature of the acoustic target, the knowledge and technology required to combine the so-called "multifrequency data" in an appropriate manner has been limited. The use of several transducers of different frequencies...
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#1George R. Cutter (NOAA: National Oceanic and Atmospheric Administration)H-Index: 5
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Cutter, G. R. Jr and Demer, D. A. 2007. Accounting for scattering directivity and fish behaviour in multibeam-echosounder surveys. - ICES Journal of Marine Science, 64.Multibeam echosounders can improve the efficiency and the precision of acoustic-survey estimates by providing greater sampling volumes than single-beam echosounders. For a multibeam echosounder, the target strength of fish can vary with its pitch, roll, and yaw. Here, normalized, acoustic backscatter patterns from fish schools are...
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#1Nils Olav Handegard (Norwegian Institute of Marine Research)H-Index: 20
Acoustic instruments are important tools for observing the behavior of aquatic organisms. This paper presents a simple but efficient method for improving the tracking of closely spaced targets using a split-beam echosounder. The traditional method has been a stepwise approach from the detection of echoes, rejection of apparently multiple targets and then tracking the remainder. This is inefficient because the split-beam angles are not included in the initial detection; rather they are only used ...
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Fishery scientists have for many years been requesting calibrated multibeam systems specially designed for fishery research applications. Simrad AS, Norway, has, in cooperation with IFREMER, France, developed a new multibeam echo sounder (ME70) and with IMR, Norway, a new multibeam sonar (MS70) for fishery research applications. Both systems have 800 transmitting and receiving channels and are based on similar hardware and software platforms. The systems are characterized by calibrated narrow be...
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The new multi‐beam sonar, MS70, is a horizontally observing sonar yielding very high spatial resolution when operating all 500 beams, covering the frequency band 75–112 kHz. The sonar has undergone sea trials from R/V G. O. Sars from December 2005. The presentation includes preliminary results obtained during this period. Topics covered will be sonar performance objectives, calibration methods, and preliminary results from calibration and school data acquisition. Examples of raw and processed 3‐...
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#1Kenneth G. Foote (WHOI: Woods Hole Oceanographic Institution)H-Index: 23
The new Simrad MS70 multibeam sonar has a nominal total bandwidth of 70-120 kHz. Scientific applications of this, as in fisheries and other ecological research, require calibration. The standard-target method is suitable. Design criteria for the standard target are that this be robust and dense, with a mass of order several kilograms and with target strength in the nominal range from ?35 to ?30 dB. Candidate targets necessarily contain resonances in their backscattering spectra. Two targets are ...
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Data exploitation, acquired by medium-frequency omnidirectional multibeam sonar, enables original studies in fisheries research but is seldom used despite the fact that such equipment is found on most fishing vessels and a number of research vessels. This is the only system for real-time monitoring of fish schools within a horizontal omnidirectional plane about a vessel or a buoy. Between 1996 and 2001, we used two standard omnidirectional sonars and developed new methodologies for exploiting th...
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Kang, M., Honda, S., and Oshima, T. 2006. Age characteristics of walleye pollock schoolechoes. e ICES Journal of Marine Science, 63: 1465e1476.The purpose of this study was to investigate the possibility of identifying the age of walleyepollock (Theragra chalcogramma) using acoustic information. Acoustic data targetingwalleye pollock were collected at 38 and 120 kHz from 16 June to 12 July 2000 in thePacific, off Hokkaido, Japan. To complement these data 33 trawl hauls were made andthe species and...
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