Sandimirov S.S. Catalogue of lakes in the Russian, Finnish and Norwegian Border Area. Finland, Jyvaskyla: Kopijyva Oy, 2008.

Perch - Perea fluviatilis L. Burbot family - Lotidae Burbot - Lota lota (L.) Carp family - Cyprinidae Minnow - Phoxinus phoxinus Sharplings family - Gasterosteidae Nine-spined stickleback - Pungitius pungitius (L.) Thornback - Gastrerosteus aculea- tus L. Analyses were carried out on the fish and individual organs (pathological and mor­ phological analysis), and the degree of heavy metal accumulation (Hg, Ni, Cu, Cd and Pb) was determined in order to assess the influence of pollution on the fish present in the lakes. The following maximum allowable values wet weight) for these elements in foodstuffs (fish) have been established in Russia,: (in Kg/g Hg 0.5 Ni 0.5 Cu 20 Cd 0.1 Pb 1 The organs and tissues of the fish in the lakes exhibit certain characteristic patho­ logical changes. The most frequently occurring ones are depicted in the figure below. Only the frequency of occurrence and intensity of the fish pathologies var­ ied in the investigated lakes. of gonads W hitefish male form of gonads Whitefish female Fibrogenesis development in kidney of whitefish Pathologies of whitefish’s kidneys: intensive fibrogenesis development nephrolithiasis S I Serious pathological transformations of whitefish 12 Catalogue ofLakes in the Russian, Finnish and Norwegian BorderArea