[7] This is because of the lakes fluctuating water level, which changes with a mean annual amplitude of 1.4 m; this is about half of its 2.8 m average depth.

After a decline of valuable species during the 1950s and 1960s, some conservation measures were enforced which lead to an improvement in the situation.

[9] In recent decades, eutrophication of the lake has increased, with detrimental effects on biological diversity.

[13] This is thought to be mainly caused by a combination of poorly treated wastewater influx as well as phosphorus and nitrate runoff from agriculture.

In addition, climatic fluctuations seem to have a stronger influence on the lake due to its shallow depth.

[14] The region is little known as a tourist destination internationally, and the deteriorating water quality has posed a problem for both fishing and tourism development.