Seasonal variation in density of juvenile Atlantic salmon in fluvial shoreline habitats of a large subarctic river

• Published in: Journal of Fish Biology
• Main Authors: Niemelä, E., Julkunen, M., Erkinaro, J., Mäukinen, T. S.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2001
• Subjects: Teno; Atlantic salmon; Subarctic; Utsjoki
• Online Access: http://dx.doi.org/10.1111/j.1095-8649.2001.tb02361.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2001.tb02361.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2001.tb02361.x

The densities of Atlantic salmon fry (0+ years) and parr (1+ years and older) in shoreline habitats of the large River Teno watercourse and its tributary, the River Utsjoki generally fluctuated considerably, showing an increase from early summer towards late August and a subsequent decline towards autumn. The seasonal pattern of variation in density was more distinct for parr than for fry. In the period between late July and early September, parr density followed a sinusoidal curve, being highest in late August and lowest in early August and in September. Fry density had a weaker seasonal profile than parr, being highest in late August and in early September. Frequency distributions of the parr age groups (1+, 2+ and 3+ years) were mainly independent of the sampling month.