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Lake spawning of brown trout related to groundwater influx
Author(s) -
Brabrand Å.,
Koestler A. G.,
Borgstrøm R.
Publication year - 2002
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.1095-8649.2002.tb01699.x
Subject(s) - brown trout , salmo , aquifer , groundwater , spring (device) , hydrology (agriculture) , trout , biology , fishery , environmental science , fish <actinopterygii> , geology , mechanical engineering , geotechnical engineering , engineering
Seepage water through a lake bottom and the layering of tight and high‐permeable layers in the aquifer produce groundwater under greater pressure than the water column of the lake. This results in under‐water springs and seepages. When spawning substrata were available, there was a spatial correlation between the degree of groundwater influx and the redd density of brown trout Salmo trutta . In high density spawning areas with > 100 observed redds ha −1 , the mean seepage water influx during spring was c . 1200 ml m −2 min −1 compared to a mean flux of 113 ml m −2 min −1 in low density spawning areas with 5–10 redds ha −1 .