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Spatial pattern of migration and recruitment of north east Atlantic mackerel

Uriarte, A.; Alvarez, Paula; Iversen, Svein A.; Molloy, John; Villamor, Begoña; Martins, Maria Manuel; Myklevoll, Sigmund
Working paper
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CM_2001_O_17.pdf (1.371Mb)
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http://hdl.handle.net/11250/106167
Issue date
2001
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  • ICES CM documents authored by IMR scientists (1949-2011) [3135]
Original version
This report is not to be cited without prior reference to the authors  
Abstract
An International tagging program on both adult and young mackerel was implemented

in 1997 (and partly in 1998) from Portugal to the Shetland isles within the frame of

European Study Project 96-035 with the objectives of clarifying the migration pattern of

adult mackerel from the southern and western areas and determining the recruitment

spatial pattern of juveniles from two nursery areas, different from the current Mackerel

box i.e. from the Northwest of Ireland and West of the Iberian Peninsula. Both external

and internal tags were used in all the surveys in different proportions. A total of 161,115

mackerel were tagged along the European Atlantic coasts, 119,913 of them in 1997 and

41,202 extras in 1998.

We report here for the recaptures obtained up to march 2001: Adult recoveries show that

almost all adult mackerel (regardless of the discrete areas of tagging, southern or

western areas) follow the same northward migration in late spring and summer time

from the spawning grounds along the west of the British Islands to the north of Faeroes,

Norwegian sea and northern part of the North Sea. The northward migration often

extends in summer time into the north-eastern areas of the Faeroes EEZ and further

north to the International waters. From September to December mackerel from all areas

are mainly found in Norwegian Sea and northern part of North Sea (mainly division

IVa). At the end of the year and during wintertime those mackerel migrate southward

towards the spawning grounds through the west of the British islands. These

observations on migration behaviour of adults are consistent with the results obtained

from previous tagging experiments. A strong presence of southern adult mackerel

during spring in the western spawning grounds has been observed what cast doubts on

the reliability of the assumption of separate spawning components in these areas.

Recaptures of tagged juveniles (both from the west of the Iberian Peninsula and from

the north-west of Ireland) suggest that in general, juveniles remain closer to the areas

where they were tagged. Once they become adults, recoveries show the recruitment to

the general migration pattern of adults.
Publisher
ICES
Series
ICES CM Documents;2001/O:17

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