page_title: Tissø
section_title: Nature
hierarchical_section_title: Tissø / Nature
caption_attribution_description: Haliaeetus albicilla English: An adult White-tailed Eagle off the coast of the Isle of Mull, Scotland. The fish is probably a dead one thrown into the sea for the eagles to collect.
context_page_description: Tissø is the 4th largest freshwater lake in Denmark, at 12.3 km². It is located on the western part of Zealand, in the municipality of Kalundborg.
  There are several small towns and villages near the lake, of which Sæby is the biggest at 343 citizens.
  In the town of Kalundborg, some of Lake Tissø's outflow is used as cooling water for the Kalundborg Eco-industrial Park.
context_section_description: Even though Tissø is steadily polluted by excess nutrients from the surrounding farmlands and inflows, the environmental standard of the lake is usually considered good, because of the high rate of water exchange and an effective natural oxygenation of surface waters. Therefore, the lake supports a rich fish and plant life, with around 20 species of fish living here. Most of the fish are spending their entire life in the lake, but a few, like the ide and the brown trout, migrates from the sea through the stream of Nedre Halleby Å. Surprisingly, the lake also houses European flounder. The flounder can live in the fresh waters of the lake, but they cannot spawn here. Tissø formerly supported commercial fishing, but is now exclusively fished by anglers only. Fishing is strongly regulated nowadays, requiring a fishing licence and is restricted to the daylight hours more than 100 m from the shores. Two larger areas of the western part of the lake, is also to be protected from both fishing and sailing, and rules apply to what size and kind of fish can be caught. According to the angling association 'Lystfiskeriforeningen Anno 1886', the lake is dominated by European perch, but a good sized population of northern pike is here as well. Other common fish includes tench, various carps and European eel. There is a small and fragile population of zander.
caption: The white-tailed eagle living at lake Tissø are rare in Denmark. The species became extinct in the country in 1917, but returned in 1995 and the population is growing. The birds are occasionally found breeding at the lake.[10][11]
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