Undersides in the deep forests of the Tide is classified as national interest. It is a groundwater lake, the flow through the bottom is about 40% of the total flow. Unden is one of our country's most important large-rooted lakes, both the topography of the lake and its ecosystem are suitable for the production of charcoal. Unden has clear cold water and is a lake with a mean depth of 34 m and the largest depth is specified to 108 m.
In the lake there are char, trout, whitefish (3 varieties), pike, perch, lake and whitefish. The largest known caught fish in Unden are; charcoal 10.5 kg, gold pole earring 14.4 kg, weight 3.2 kg, perch 2.8 kg and pike 17.0 kg. Implanted hatchery plays in running water after about 3 years. From being smolt, the ear lives 1-2 years in the hatch biotope, then go out into the lake and eat big and strong. A number of these then return to the game biotope for new play.
Calculation of Undens inflow occurs annually and water samples are taken continuously to monitor the best water quality. Fishing rules are introduced to ensure sustained fishing.
Unden has an area of 9540 ha and has 13 streams as streams. The lake's average depth is 35 meters and the largest depth is 108 meters. Drainage takes place through three power plants owned by Sätra Bruk AB. The drainage is at most 6 m3 per second (= 8640 m3 per day). Göta Kanalbolag AB, which has the original water right, supplies the channel with the required water level for sealing. The drainage also goes through the power plants.
Edsån that connects Unden with the Gulf does not belong to the fishing area.
Undens Fiskerättsforening was formed in the mid-1950s. This association was formed to act an active counterparty against Sweden's first commercial nuclear power plant, which was never subordinated to Unden . To get help with limking measures when ph approached 5.0, Undens FVO association was formed. Since 1977, Undens FVO has received state subsidies for liming measures.
Limestone crusher has been drowned in the playgrounds of the redding. Undes influences are calcified annually by boat and helicopter.
Water samples are taken 4 times / year at 5 predetermined places in order to be able to follow water quality over time. We have very good values and this is very important that it is maintained. Fishing rules are introduced to ensure sustained fishing.
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