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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on May 2, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(8):1762-1767; doi:10.1093/icesjms/fsp116
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

This article appears in the following ICES Journal of Marine Science issue: Herring: linking biology, ecology, and status of populations in the context of changing environments [View the issue table of contents]

Variation in spatial distribution and migration of Icelandic summer-spawning herring

Gudmundur J. Óskarsson, A. Gudmundsdottir and T. Sigurdsson

Marine Research Institute, Skulagata 4, 121 Reykjavik, Iceland

Correspondence to G. J. Óskarsson: tel: +354 575 2000; fax: +354 575 2001; e-mail: gjos{at}hafro.is

Óskarsson, G. J., Gudmundsdottir, A., and Sigurdsson, T. 2009. Variation in spatial distribution and migration of Icelandic summer-spawning herring. – ICES Journal of Marine Science, 66: 1762–1767.

The distribution of the fishable stock of Icelandic summer-spawning herring (Clupea harengus L.) and the overwintering grounds have changed with fishing seasons from 1978/1979 through 2006/2007. The possible causes investigated include variation in sea temperatures, stock size, and annual recruitment. The stock collapsed as a result of overfishing and environmental changes during the late 1960s, since when the spawning stock has gradually increased, from 11 kt in 1972 to 800 kt in 2006. These changes coincided with geographic variation in its distribution. We identify five phases, based on a graphic analysis and the centre of gravity of the fishery. Investigations on a large geographic scale gave no clear indication that sea temperature has affected the distribution. Changes were also not clearly related to stock size or year-class strength. The distribution change in the late 1990s may be partly explained by year classes adopting a new migration pattern when entering the fishable stock.

Keywords: distribution, fishery, herring, Iceland, logbooks, migration

Received 5 September 2008; accepted 15 February 2009; advance access publication 2 May 2009.


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