Sandimirov S. Specific Features of Accumulation of Cu, Ni, Zn, Cd and Hg in Two Whitefish Coregonus lavaretus (L.). Morphs Inhabiting the Inari-Pasvik Lacustrine-Riverine System. Inland Water Biology. 2011, Vol. 4, №, p. 383-392.

388 KASHULIN et al. ^g/g (A) 40 20 1600 1200 800 400 J ____ I_____I_____I____ L 1 2 3 4 5 Fig. 3. Contents of Zn (A, B) and Cd (C, D) in the organs of sparsely rakered (A, C) and medium-rakered (B, D) whitefish in the Pasvik River basin waterbodies. Other legends are the same as in Fig. 2. ferences in Ni accumulation in whitefish tissues were statistically significant in all studied waterbodies (t = 2.24...15.43,p >0.05). Zinc The body concentrations o f zinc were considerably higher than other chemical elements. The highest val- ues were found in the whitefish gill (>1000 ^g/g) and kidney (400 to1100 ^g/g). The intensity of Zn accumu - lation in the organisms of medium- and sparsely rak­ ered whitefish morphs changed in the order kidney > gill > liver > muscles and gill > kidney > liver > muscles, respectively. Among all studied organs, significant dif­ ferences in the accumulation o f Zn in two whitefish morphs from Kuetsjarvi, Skrykkebukta, and Vaggetem (t = 2.02...8.10,p > 0.05) were revealed. In the fish from Inari Lake, the differences were significant only in liver (t = 2.91). The content o f Zn in the fish from the Pasvik midstream (Vaggetem Reservoir) and near the Skrykkebukta Rserevoir were higher than down­ stream (Table 2 and Fig. 3). In Lake Kuetsjarvi the accumulation of Zn by fish was, as a rule, the lowest (t = 2 .12 .9 .25 , p > 0.05). Cadmium The content of Cd in the whitefish organs declined with distance from the Pechenganickel smelter. This was especially pronounced in the whitefish gill, liver and kidney (Fig. 3). The contents of Cd in the kidney of fish from Lake Kuetsjarvi and Skrykkebukta Reser­ voir, which are subject to stronger impact from the smelter, reached 15 ^g/g (kidney) and 2—2.3 ^g/g) (liver) (Table 2 and Fig. 3). The Cd content of the organs decreased in the order kidney > liver > gill > muscles. The differences in Cd levels between the studied morphs of whitefish were significant in the gill and liver o f the fish from Lake Kuetsjarvi (t = 2.44 and 3.90, p > 0.05); they were significant in muscles and liver in those from the Vaggetem Reservoir (t = 2.16 and 2.33, p > 0.05). The levels o f Cd in the fish from INLAND WATER BIOLOGY Vol. 4 No. 3 2011