caa a22 4500 397550847 CHVBK 20180308164749.0 cr unu---uuuuu 161202e199604 xx s 000 0 eng 10.1006/jmsc.1996.0051 doi (NATIONALLICENCE)oxford-10.1006/jmsc.1996.0051 Pedersen Jens Danish Institute for Fisheries Research, the North Sea Center, DK-9850, Hirtshals, Denmark Discrimination of fish layers using the three-dimensional information obtained by a split-beam echo-sounder [Elektronische Daten] [Jens Pedersen] This study attempts to illustrate the three-dimensional pattern of a "pelagic” and a "benthic” layer of fish using single-target information obtained using a split-beam echo-sounder. Parameters such as the nearest-neighbour distance and separation angle between the two nearest neighbours around a reference fish were used to discriminate between the two layers. The parameters estimated were found to be significantly different between the two layers. The mean nearest-neighbour distance estimated was 6.3 m and 8.8 m for the "benthic” and the "pelagic” layers, respectively, and the mean separation angle between neighbours around a reference fish was 68° and 74°, respectively. The estimated mean target strength (TS) was found to be significantly different for the two layers and conforms to the theoretical TS calculated from the diurnal species and size composition of the layers. It was concluded that illustration and discrimination between the two layers was possible using parameters related to the relative position of targets. © 1996 International Council for the Exploration of the Sea Regular Articles nationallicence layer of fish nationallicence split-beam echo-sounder nationallicence three-dimensional information nationallicence ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 371-376 1054-3139 53:2<371 1996 53 icesjms https://doi.org/10.1006/jmsc.1996.0051 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1006/jmsc.1996.0051 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Pedersen Jens Danish Institute for Fisheries Research, the North Sea Center, DK-9850, Hirtshals, Denmark NATIONALLICENCE 773 0- ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 371-376 1054-3139 53:2<371 1996 53 icesjms Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford