Abstract:
:Juvenile and adult scale characteristics were used to compare two juvenile groups of Atlantic salmon in a large subarctic river in northern Scandinavia: individuals that have migrated from the main stem into small tributaries and those which remain in the main stem. Body size and scale measurements indicated enhanced growth in migratory parr as compared to their resident main stem counterparts. Analysis of adult salmon scale characteristics using maximum likelihood estimators revealed that 20% of the adults had been in the tributaries before the end of their second year of life, and more than 30% more had moved into the tributaries in the third year. Tributary fish matured at a smaller size and younger age (one-sea-winter salmon) than those rearing in the main stem which included a higher proportion of multi-sea-winter salmon. In addition, when smolt ages and ages at maturity were compared, older female smolts often resulted in smaller spawners and younger smolts, larger spawners. Small female spawners were more likely to survive to become repeat spawners.
journal_name
J Fish Bioljournal_title
Journal of fish biologyauthors
Erkinaro J,Dempson JB,Julkunen M,Niemelä Edoi
10.1111/j.1095-8649.1997.tb01134.xsubject
Has Abstractpub_date
1997-12-01 00:00:00pages
1174-1185issue
6eissn
0022-1112issn
1095-8649journal_volume
51pub_type
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