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Communication at the NABS Annual meeting, Keystone, 2000
(61) HABITAT SELECTION AND BEHAVIOUR OF WILD AND DOMESTICATED BROWN TROUT (SALMO TRUTTA L.) IN DANISH STREAMS.
S. Pedersen1, N. Friberg2, and A. Baattrup-Pedersen2. 1Danish Institute for Fisheries Research, Dept. of Inland Fisheries, DK-8600 Silkeborg, Denmark, 2National Environmental Research Institute, Department of Streams and Riparian Areas, DK-8600 Silkeborg, Denmark
In two Danish lowland streams (width 4 – 6 m, depth 10 – 150 cm) a section with high physical variation and a physically more homogenous section were fenced off from the rest of the stream. Natural inhabiting trout (Salmo trutta L.) larger than 15 cm T.L. were removed. Wild trout (24 – 33 cm T.L.) were introduced in the isolated sections of the streams, together with trout from a hatchery strain (25.5 – 34 cm T.L). All introduced trout were tagged with either surgically implanted radio transmitters or with radio transmitters and Data Storage Tags (DST) measuring pressure (depth), light and temperature. Selected habitats were determined by triangulation. Vegetation cover (in-stream and riparian) and physico-chemical features (substrate, depth, current velocity, light, oxygen, etc.) were measured in the selected habitats and compared to in-stream areas without trout.
The experiments were repeated 2 times in each stream.
Presented at 4:45 PM on Monday, May 29, 2000 in Spatial and Temporal Variation in Aquatic Communities II
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