Relationship in distribution of blue whiting and hydrographic conditions in the Norwegian Sea during summer, 1980 -85
Working paper
Permanent lenke
http://hdl.handle.net/11250/104205Utgivelsesdato
1986Metadata
Vis full innførselSamlinger
Originalversjon
This report is not to be cited without prior reference to the authorsSammendrag
During the summer period in the Norwegian Sea the stock of blue
whiting was found to have decreased considerably from 1980 to 1983.
Although the stock increased again, the adult part of it continued to
decrease and in 1985 only 0.5 mill.tonnes of it were found.
Particularly in the northern Norwegian Sea this was associated with an
increasingly dispersed distribution and lack of fishable
concentrations.
Blue whiting was found to feed in water of temperatures from 0° to
8°C, with preference for 5-7°C, i.e., Atlantic water. The change in
distribution and abundance of blue whiting in the Norwegian Sea observed in this period may therefore not only result from a general
decrease in the stock, but also from environmental fluctuations.
If the hydrographic conditions were important for these changes, they
are not likely to be found in the Atlantic water. It is, however, more
likely that the increasing extent of Artic water in the East Icelandic
Current has been decisive.