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ICES Journal of Marine Science: Journal du Conseil 1997 54(2):206-212; doi:10.1006/jmsc.1996.0186
© 1997 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Size-specific vertical distribution of Baltic cod (Gadus morhua L.) eggs in the Bornholm Basin in 1993 and 1994

Ewa Wlodarczyk and Katarzyna Horbowa

Sea Fisheries Institute ul. Kollataja 1, 81-332, Gdynia, Poland

The vertical distribution of Baltic cod eggs in relation to seawater density in the Bornholm Basin is described. Mean egg diameters, measured on preserved material, were found to be inversely proportional to ambient water density. The mean depths of the centre of egg mass, z, were 66 m and 59 m in 1993 and 1994, respectively, the shallower location in 1994 being related to the larger modal egg diameter in that year. The analysis of egg abundance in two developmental groups showed that older eggs were consistently more abundant in the 10-m depth layer immediately below the layer of z occurrence.

Keywords: cod eggs, egg size, vertical distribution, Baltic Sea

Received 17 October 1995; accepted 17 June 1996.


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