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Characteristics of mature male parr in the northernmost Atlantic salmon populations

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The incidence, relative abundance and biological characteristics of mature male parr of Atlantic salmon Salmo salar were studied in two subarctic (69–70 N°) river systems in the northernmost part of Scandinavia. The proportion of mature males was low (0–25%) among ≥1 year‐old parr, and clearly lower than reported earlier in more southern rivers. The ages of mature males ranged from 1+ to 6 + year, the most abundant age group was 3 + year. Both age structure and size of the mature male parr varied between rivers and years. Mature male parr in the main stem were younger and also smaller than the parr of the same age in the tributaries.
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Keywords: Salmo salar; age distribution; precocious parr; size; subarctic river

Document Type: Regular Paper

Affiliations: 1: Inari Fisheries Research and Aquaculture, Finnish Game and Fisheries Research Institute, FIN-99 870 Inari, Finland and 2: Oulu Game and Fisheries Research, Finnish Game and Fisheries Research Institute, Tutkijantie 2A, FIN-90 570 Oulu, Finland

Publication date: 01 January 2004

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