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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on June 17, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(7):1198-1202; doi:10.1093/icesjms/fsn101
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Buoyancy and vertical distribution of Norwegian coastal cod (Gadus morhua) eggs from different areas along the coast

Erling Kåre Stenevik, Svein Sundby and Ann Lisbeth Agnalt

Institute of Marine Research, PO Box 1870, Nordnes, 5817 Bergen, Norway

Correspondence to E. K. Stenevik: tel: +47 55 23 84 86; fax: +47 55 23 85 31; e-mail: erling.stenevik{at}imr.no.

Stenevik, E. K., Sundby, S., and Agnalt, A. L. 2008. Buoyancy and vertical distribution of Norwegian coastal cod (Gadus morhua) eggs from different areas along the coast. – ICES Journal of Marine Science, 65: 1198–1202.

There are significant genetic differences in coastal cod (Gadus morhua) along the Norwegian coast, and in order to maintain these differences, there must be mechanisms that ensure local retention of eggs and larvae in the spawning areas. The buoyancy of eggs from four different areas along the Norwegian coast was measured using a density gradient column, and the results from modelling experiments showed that in three of the groups (Tysfjord, Helgeland, and Øygarden), the buoyancy in combination with local hydrography would place the eggs in subsurface waters where retention is greater than in surface waters.

Keywords: buoyancy, eggs, Gadus morhua, retention

Received 16 January 2008; accepted 25 May 2008; advance access publication 17 June 2008.


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