Relation of growth and condition with the <Emphasis Type="Italic">Pan</Emphasis> I locus in Atlantic cod (<Emphasis Type="Italic">Gadus morhua</Emphasis> L.) around Iceland |
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Authors: | Ingibjörg G Jónsdóttir Guðrún Marteinsdóttir Christophe Pampoulie |
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Institution: | (1) Marine Research Institute, Skúlagata 4, P. O. Box 1390, 121 Reykjavik, Iceland;(2) Department of Biology, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland |
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Abstract: | Growth and condition (both somatic and hepatosomatic index) of Atlantic cod spawning at different locations around Iceland
was studied in relation to the Pan I locus. South of Iceland cod carrying the Pan IAB and Pan IBB genotypes were more frequent while cod carrying the Pan IAA genotype was more frequent north of Iceland. Differences in growth were detected between cod spawning at different areas
around Iceland. Cod spawning south of Iceland grew faster than cod spawning north of Iceland. Differences in growth rate were
also observed among cod carrying different Pan I genotypes within a spawning area. The least frequent Pan I genotype expressed the highest growth in both south and north of Iceland. Cod carrying the Pan IAA grew fastest at spawning locations south of Iceland, while cod carrying the Pan IBB genotype grew fastest in north of Iceland. A consistent relationship between condition and the different Pan I genotypes was also observed in all the areas. Cod carrying the Pan IAA expressed the highest somatic condition and the lowest hepatosomatic index. Together, these results indicate that the relation
of growth and condition with the Pan I locus is more complicated than earlier thought and is likely to be influenced by other factors, like size-selective fishing
and food supply. |
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