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dc.contributor.authorHuse, Irene
dc.contributor.authorNedreaas, Kjell Harald
dc.contributor.authorGundersen, Agnes C.
dc.date.accessioned2008-07-24T10:34:32Z
dc.date.issued1997
dc.identifier.isbn5-86349-048-9
dc.identifier.urihttp://hdl.handle.net/11250/107615
dc.descriptionGear selection and sampling gears. Proceedings of the seventh IMR-PINRO Symposium. Murmansk, 23-24 June 1997.en
dc.description.abstractSelectivity parameters for Greenland halibut (Reinhardtius hippoglossoides, Walbaum) are compared to catches reported fiom trawl, gillnets and longline in the Norwegian scientific fisheries for Greenland halibut. A trouser trawl selectivity experiment reported here gives an L50 at 43 cm in 135 mm codend. A selectivity analysis of the gillnets using loglinear models is done, and show maximum retention probability for lengths at 40.6 - 63.8 cm for the five mesh-sizes used. The effect of the fishiig strategy is analysed in respect to the selectivity of the gear used and the diskibution of length and age in the catches. To avoid possible bias from strong dominating yearclasses and selection in these comparisons, length-at-age data are used. The sex-ratio in gillnet catches is shown to be a linear fiinction of meshsize. Our data show no trend in length distribution with depth. We show that calculated growth of female Greenland halibut is affected by the selectivity of the gears. It is shown that growth parameters calculated fiom gillnet catches may be biased due to the selection properties in the gillnets. These analyses will provide a better understanding of possible sarnpling bias when sampling a stock with only one gear.en
dc.format.extent8580981 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.publisherPINRO Press
dc.relation.ispartofseriesPINRO-IMR Symposiumen
dc.relation.ispartofseries7en
dc.titleRelative selectivity in trawls, longline and gillnets on Greenland halibuten
dc.typeConference objecten
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924
dc.source.pagenumbers. 107-120


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