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

mented in Lake Mellalompolo.The most frequently occurring pathologies ofwhitefish are pathologies of the liver (72%), kidneys (52%) and gills (27%).These pathologies are similar to those found in whitefish from lakes Kochejaur and Virtuovoshjavr. H eavy m eta ls in fish The heavy metal concentrations (§u, Ni, Pb and Hg) in fish muscle do not exceed the standard values (Table. 47). The metal concentrations (|ig/g of dry weight) in other organs of whitefish are higher than those in muscles: Cu in liver (to 22.9 Hg/g), Ni in kidneys (to 4.4 (ag/g). The Cd concentrations in the kidneys of whitefish and char are much higher than those in muscular tissue (12.7 and 14.1 |ig/g, respectively). The accumulation of Hg in the kidneys ofwhitefish, char, trout and grayling are 2-3 times higher than in the muscles. There were no clear trends in metal accumulation between the different fish species. However, Cu had accumulated more strongly in trout liver, and the maximum Ni con­ centration is in whitefish kidneys and the maximum Hg concentration in pike muscle. Perch has the highest concentration of Cd in muscle (Fig. 74). Standard value Concentration in muscle Concentration in muscle ( ц д / д wet weight)* (pg/g wet weight) (pg/g of dry weight) Char Hq 0.5 0.20 0.84 Ni 0.5 0.16 0.71 Cu 20 0.28 1.19 Cd 0.1 0.004 0.02 Pb 1 0.04 0.17 Whitefish Hq 0.5 0.11 0.53 Ni 0.5 0.14 0.65 Cu 20 0.16 0.72 Cd 0.1 0.004 0.02 Pb 1 0.03 0.13 Trout H9 0.5 0.23 1.01 Ni 0.5 0.16 0.69 Cu 20 0.27 1.15 Cd 0.1 0.003 0.01 Pb 1 0.02 0.07 Pike Table 47. Standard values for heavy metal concentra­ tions in foodstuffs and in fish muscle in Lake Mellalompolo (in цд/д wet and dry weight). Hq 0.5 0.28 1.37 Ni 0.5 0.12 0.57 Cu 20 0.14 0.68 Cd 0.1 0.002 0.01 Pb 1 - <0.05 Grayling Hq 0.5 0.20 0.93 Ni 0.5 0.15 0.69 Cu 20 0.19 0.92 Cd 0.1 0.003 0.02 Pb 1 0.02 0.08 * Source: Sanitary..., 1986. 128 Catalogue o f Lakes in the Russian, Finnish and Norwegian Border Area