Tidsskrift : ICES Journal of Marine Science , vol. 63 , p. 246–252 , 2006
Utgiver : Oxford University Press
Trykt : 1054-3139
Elektronisk : 1095-9289
Publikasjonstype : Vitenskapelig artikkel
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Body weight, occurrence of spinal deformity, and sexual maturity were recorded in 51 fullsib
families of the strains coastal and Arctic cod at two years of age. The family groups
were located at three sites along the Norwegian coast including Hordaland, Møre and
Romsdal (M&R), and Nordland County to detect genetic variation in important production
traits and to investigate interactions between genetic composition and production environment.
Body weight varied among locations partly owing to different production conditions.
There were also large differences among the locations with respect to spinal deformity.
M&R had the highest occurrence of spinal deformity ( p < 0.001). Comparison of sexual
maturity among the locations was made difficult owing to the different ways the trait was
recorded. Only small differences were found between coastal and Arctic cod in spinal deformity
( p < 0.05 in Hordaland) and sexual maturity ( p ¼ 0.06 in M&R), while no differences
were found for body weight. Heritability estimates for body weight (0.51), spinal
deformity (0.27), and sexual maturity (0.21) indicate the potential for improvement of all
three traits by selective breeding using a family-based selection programme. Final recordings
at the end of the growing period will provide further information. Genetic correlations
estimated between weight and occurrence of spinal deformity (rg ¼ 0.50) suggest that caution
be used when selecting for growth, and that a need exists for including spinal deformity
in the selection index. No significant correlations were found between these two traits and
the incidence of sexual maturity.