Specialists from the A.N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences, the Institute of Industrial Ecology of the North of the Kola Science Center of the Russian Academy of Sciences, and colleagues from the Zoological Institute of the Russian Academy of Sciences conducted an ichthyological study in Lake Imandra - the largest body of water in the Murmansk Region - and discovered how climate change is altering fish food competition in northern lakes.