Catalogue of Lakes in the Russian, Finnish and Norwegian Border Area = [Каталог озер в приграничном районе России, Финляндии и Норвегии] / Nikolay A. Kashulin, Vladimir A. Dauvalter, Sergey S. Sandimirov etc. - Apatity : Institute of the North Industrial Ecology Problems KSC RAS etc., 2008.

Fig. 21. Size and weight distribution of the sparsely rakered whitefish in Lake Virtuovoshjaur. Fig. 23. Size and weight distribu tion of the perch in Lake Virtuovoshjaur. 22). The sex distribution of the fish is regular, with a slight predominance of males. Some individuals in the lake become mature at the age of 3, with a minimum weight of 40 g and length 16.5 cm. The size of some pikes reaches 54.4 cm with a weight of 1195 g. The mean size and weight do not exceed 45.2 cm and 688 g, respectively. 7-year old fish are the most abundant. The mean size of perch inhabiting the lake is 24.3 cm, and mean weight 240 g. The bulk of the population consists of fish with a weight of less than 400 g and length 25-30 cm, although specimens with a weight of 1460 g and length of 42.6 cm can be found (Fig. 23). The age limit of perch in the lake can reach 16 years, but 6- to 8-year- old fish constitute the bulk of the population. 84% 75% 65% 56% 47% 37% 28% 19% 9% 0% 180 37% 160 33% 140 28% 120 > 23% I 100 3 о с 19% I /j:§ \ 80 3 III \ ill \ 60 14% д \ / И З \ 40 9% : / 1 y _ І1ІШ j .. *.. . 20 0 5% 0% /ЩШ ill -100 100 300 500 700 0 200 400 600 800 Weight, g 10 14 18 22 26 30 34 38 42 Length AC, cm 0+ 1+ 2+ 3+ 4+ 5+ 6+ 7 + 8+ 9+ > 3 Fig. 22. Age distribution of the sparsely rakered whitefish in Lake Virtuovoshjaur. Age, yrs 55% 45% 36% 27% 18% -200 200 600 1000 1400 1800 0 400 800 1200 1600 Weight, g 35 30 25 > 20 3 с 15 3 10 5 0 47% 44% 40% 36% 33% 29% 25% 22 % 18% 15% 11% 7% 4% 0 % 15 20 25 30 35 40 45 Length, sm 50 26 24 22 20 • 18 16 14 12 10 8 6 4 2 J0 58 Catalogue o f Lakes in the Russian, Finnish and Norwegian BorderArea