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Restoring migratory salmonid populations in regulated rivers in the northernmost Baltic Sea area, Northern Finland – biological, technical and social challenges
Author(s) -
Erkinaro Jaakko,
Laine Anne,
MäkiPetäys Aki,
Karjalainen Timo P.,
Laajala Esa,
Hirvonen Arto,
Orell Panu,
Yrjänä Timo
Publication year - 2011
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.2011.01851.x
Subject(s) - hydropower , fishery , fish migration , hydroelectricity , fish <actinopterygii> , fish stock , baltic sea , environmental resource management , stock (firearms) , environmental planning , biology , ecology , geography , environmental science , oceanography , geology , archaeology
Summary This paper summarizes the objectives, activities initiated and approaches used in developing Atlantic salmon stock re‐building programmes in three large river systems in northern Finland in order to identify the priorities for research and management for further restoration and rehabilitation steps. Until recently, these historically renowned major salmon rivers have been harnessed for hydropower for 40–60 years without provisions for fish passage. Hydropower companies are obliged to compensate for the losses caused by dam construction by annual fish releases, including juveniles of Atlantic salmon and migratory brown trout. Returning fish are harvested in the designated ‘terminal fishery areas’ at river mouths. Recently, activities aimed at restoring salmonid stocks have started in all these rivers. First fishways at the dams closest to the river mouths were constructed on two rivers, and preliminary projects were completed to review the preconditions for restoration, options for bypassing the dams, and to study the performance of these fishways. New projects incorporating further detailed fishway planning are underway. The various projects have proved successful in bringing together authorities, hydropower companies, local organizations, and expertise from various institutions for a joint effort to tackle these multifaceted and multidisciplinary problems.