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Characteristics of mature male parr in the northernmost Atlantic salmon populations
Author(s) -
Heinimaa S.,
Erkinaro J.
Publication year - 2004
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2004.00308.x
Subject(s) - salmo , biology , tributary , subarctic climate , abundance (ecology) , salmonidae , fishery , main stem , ecology , zoology , fish <actinopterygii> , geography , cartography , horticulture
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.