Swept area variation with depth and its influence on stratified trawl surveys indices on Arcto-Norwegian cod
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http://hdl.handle.net/11250/104141Utgivelsesdato
1986Metadata
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This report is not to be cited without prior reference to the authorsSammendrag
Stratified trawl surveys have been carried out in the Barents
Sea and the Svalbard areas since 1981. Based on the assumption
of a constant area swept by the trawl during a standard trawl
haul at any depth, swept area abundance indices have been
presented for both areas. The results have been used in the
management of the Arcto-Norwegian cod stock.
In this paper results from measurements of trawl geometry
during trawling operation during a standard stratified trawl
survey in the Svalbard area in September-October 1985 are
presented and the implication on the trawl indices of these
results are discussed.