Report of the joint Norwegian-Russian acoustic survey on blue whiting, spring 1993
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http://hdl.handle.net/11250/105176Utgivelsesdato
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This report is not to be cited without prior reference to the authorsSammendrag
In spring 1993 the fourth joint Norwegian-Russian acoustic
survey on the blue whiting spawning stock was carried out. The
area to the west of The British Isles was covered by two
vessels, one operating in the north-south direction and the
other one in the south-north direction. The distribution could
hence be confined to two periods and together with recordings
in a third period thus gave illustration of a northward postspawning
migration.
The spawning stock size was estimated to 4.9 mill. tonnes;
i.e. 0.6 mill. tonnes more than in 1992. This increase was
mainly due to the numerous 1989-yearclass which contributed
with more than 60% in numbers to the stock.
The influence of the North Atlantic Current was found to be
the same as in 1992.