dc.contributor.author | Misund, Ole Arve | |
dc.contributor.author | Aglen, Asgeir | |
dc.date.accessioned | 2012-09-06T06:26:02Z | |
dc.date.available | 2012-09-06T06:26:02Z | |
dc.date.issued | 1993 | |
dc.identifier.citation | This report is not to be cited without prior reference to the authors | no_NO |
dc.identifier.uri | http://hdl.handle.net/11250/105121 | |
dc.description.abstract | The shape and horizontal extent of herring schools in the North Sea have been mapped by
a naval sonar (SIMRAD SA 950) with narrow horizontal beam width. The density of schools
that were passed over was measured by the SIMRAD EK 500 echo sounder.
In most cases the school shape fit a geometric category (circle, oval, square, rectangle,
parabol), but a few schools had an undefined, amorph appearance. The fish density within the
schools varied by a factor of about 100, but there were clear relationships between the
geometric dimensions and biomass of the schools. The variation in the dimension-to-biomass
relationships reduced substantially by classifying the schools according to density. | no_NO |
dc.language.iso | eng | no_NO |
dc.publisher | ICES | no_NO |
dc.relation.ispartofseries | ICES CM Documents;1993/B:16 | |
dc.subject | herring | no_NO |
dc.subject | sild | no_NO |
dc.subject | echo sounder | no_NO |
dc.subject | ekkolodd | no_NO |
dc.subject | sonar | no_NO |
dc.subject | schooling fish | no_NO |
dc.subject | stimfisk | no_NO |
dc.title | On the shape, size and density of North Sea herring schools as mapped by echo integration and accurate sonar projection | no_NO |
dc.type | Working paper | no_NO |
dc.subject.nsi | VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ethology: 485 | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 | no_NO |
dc.source.pagenumber | 16 s. | no_NO |