Open AccessGrowth analysis of presmolt Atlantic salmon Salmo salar at three sections of a small Norwegian stream
Author(s) -
Lund Roar A.,
Heggberget Tor G.
Publication year - 1985
Publication title -
ecography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.973
H-Index - 128
eISSN - 1600-0587
pISSN - 0906-7590
DOI - 10.1111/j.1600-0587.1985.tb01182.x
Subject(s) - salmo , tributary , environmental science , sampling (signal processing) , epilimnion , streams , hydrology (agriculture) , ecology , fishery , nutrient , biology , geography , geology , fish <actinopterygii> , eutrophication , computer network , cartography , geotechnical engineering , filter (signal processing) , hypolimnion , computer science , computer vision
The growth of Atlantic salmon parr was investigated at three different sections of the small stream Levangerelva and its tributary during the period October 1978 to October 1979. Mean growth varied significantly between the sampling sites studied. The growth was found to be density dependent at all the sampling stations. Faster growth in the tributary was considered to be related to warm water draining from the epilimnion of a lake situated 2 km above the sampling site and a greater supply of alloctonous food from the alder wood covering parts of the stream banks. Differences in nitrogen and phosphorus content, conductivity, pH, total hardness and humus content of the stream water did not show any relation to growth variations in the different parts of the stream.