The Rehabilitation of Norway's Largest Lake

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Abstract
Lake Mjøsa, situated in the southeast of Norway, is the largest lake in Norway. Originally it was an oligotrophic lake, rich in oxygen down to its deepest part, 449 m below the surface and 328 m below sea level. In the period after 1950 signs of eutrophication developed reaching a maximum in the mid-1970's with the mass occurrence of filamentous blue-green algae. Comprehensive investigations have yielded data on the physical, chemical and biological characteristics of the lake. The trophic state is well described by the Vollenweider model. A phosphorus control program was suggested and made possible through Government funds. The Ministry of Environment organized a campaign which began in 1977 and which already seems to give the results expected.

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