Fish
Lake Vänern has many different fish species. Locals and government officials try to enforce fishing preservation projects, due to various threats to the fish habitats. These threats include water cultivation in the tributaries, pollution and the M74 syndrome. Sport fishing in Lake Vänern is still free and unregulated, both from the shores and from boats (with some restrictions, e.g. a maximum of three salmon or trout per person per day). Only commercial fishing requires permission.
In the open waters of Lake Vänern, the most common fish is the smelt, dominating in the eastern Dalbosjön, where the average is 2,600 smelt per hectare. The second most common fish is the vendace (Coregonus albula), also most prominently in Dalbosjön, with 200–300 fish per hectare. The populations may vary greatly between years, though, depending on temperature and the water level and quality.
The fish in Lake Vänern are important for the industry of the towns around it. In 2001, 165 tons (165,000 kg) of vendace, 100 tons of whitefish, and 25 tons of eel were caught.
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