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Distribution and growth of blue whiting in the north-east Atlantic

Monstad, Terje
Working paper
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CM_1990_H_14.pdf (7.969Mb)
URI
http://hdl.handle.net/11250/104791
Date
1990
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  • ICES CM documents authored by IMR scientists (1949-2011) [3138]
Original version
This report is not to be cited without prior reference to the author  
Abstract
The distribution pattern of the blue whiting spawning stock has

gradually changed in recent years, and concentrations are recorded

more offshore and more to the south than before. The activity of the

fleet with its shifting of fishing localities, gives knowledge of the

blue whiting's migration route during the spawning season.

Also during the summer season the distribution pattern has changed.

The recordings of the highest concentrations have shifted from north

and northwest of the warmer side of the Norwegian Sea to more southern

parts. The acoustic estimates, which are considered as indices only,

have decreased noticeably since the beginning of the 1980's. Some

years they have been lower than the spawning stock assessments, and

thus demonstrated that the total stock has not been properly covered

during the feeding season.

In the period from 1983 to 1987 the structure of the blue whiting

stock has been dominated by the strong of 1982- and 1983-yearclasses.

The growth of blue whiting, based on observed lengths as well as backcalculated

lengths, is described for various years and yearclasses as

occurring in various areas. Especially the 1982-and 1983-yearclasses

when, as juveniles, being basis for the mixed industrial fishery in

the North Sea.

The growth pattern varied significantly among the various yearclasses,

and the rate increased with increasing years up to the 1978-yearclass.

Thereafter this effect was reversed up to the 1983-yearclass.

After the age of 5 years the blue whiting growth pattern may diverse

significantly from area to area, and off the Norwegian Coast blue

whiting grow to a larger size than more offshore in the Norwegian Sea

and west of the British Isles. However, while the growth in the

Hebrides area was quite similiar to that in the Norwegian Sea, it

differed slightly from the growth in the Porcupine bank area. This

indicates influence of blue whiting from other areas not taking part

in the migration back to the Norwegian Sea. Analysis of annual zone

measurements also indicates differences in the stock.
Publisher
ICES
Series
ICES CM Documents;1990/H:14

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