Individual growth rate and age at first sexual maturity in Atlantic salmon
Research report
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http://hdl.handle.net/11250/114428Utgivelsesdato
1978Metadata
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Growth rates and possible connection between growth rate and age at maturation
were studied on individually tagged salmon originating from different river populations.
Great variations in growth rate and in age at first maturity were found among sibgroups
of salmon originating from different populations (localities). Although much less
pronounced, variations in these traits were also noted among groups within the localitics.
When separating the individuals into groups according to age at first maturity, small
variations were found within populations for smolt size, size after one summer and size
after one year in the sea. The correlation between age at maturation and earlier growth
rate thus seems to be rather small.
Significant correlations were found between size (length) at different times after the
smolt stage both concerning the group means and the individual deviations from the
means.
Mature fernale grilse stripped for eggs survived at about the same rate as immature
fish during the spawning season while the survival rate of male grilse was considerably
lower. Weight gain for immature fish during the same period was about two and a half
time that of mature females and three times that of mature males.
Serie
Fiskeridirektoratets skrifter, Serie Havundersøkelservol 16 no 13