||Trenkel Verena1, Mazauric Valerie2, Berger Laurent2
||1 : IFREMER, Dept EMH, F-44311 Nantes 03, France.
2 : IFREMER, Dept NSE, Plouzane, France.
||ICES Journal of Marine Science (1054-3139) (Oxford university press), 2008-05 , Vol. 65 , N. 4 , P. 645-655
|WOS© Times Cited
||Three dimensional, Behaviour, Acoustics, Abundance
||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 70120 kHz, spanning at most 150 degrees. All beams are stabilized in vessel roll and pitch. It has reduced side-lobe levels, up to -70 dB (two-way) instead of the -2S 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.