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

the densely rakered form. The mean weight is 353 g, but fish over one kilogram (1263 g) have been caught. The length of sparsely rakered whitefish reaches 45.2 cm (average 29.7 cm). The most numerous form of this fish are 25-35 cm long, with a weight of 200-400 g (Fig. 53). The age limit of sparsely rakered whitefish does not exceed 10 years. The bulk of the population (around 80%) consists of 5- to 6-year-old fish (Fig. 54a). Fish in other age classes are only occasionally caught. Males dominate over females (1.4:1). Despite the fact that the age limit of sparsely rakered whitefish is 15 years, specimens from younger age groups and those older than 10 years are absent (Fig. 54b).The population is domi­ nated by 7-year-old fish. Sparsely rakered whitefish, in contrast to the densely rakered form, have higher growth rates in the older age groups. Thus the weight of 10-year- old sparsely rakered whitefish is twice as high as that of similar-aged densely rakered whitefish. The sex distribution of the population is dominated by female fish (1.7:1). 44% г 41% 37% 33% 30% 26% 22 % 19% 15% 11 % 7% 4% o%L -20 20 60 100 140 180 220 260 Weight, g 24 22 20 18 16 14 12 10 8 6 4 2 0 10 12 14 16 18 20 22 24 26 28 30 Length, cm > 3 Fig. 52. Length and weight distribution of the densely rakered whitefish in Lake Stuorajavre. 200 600 1000 400 800 1200 Weight, g > 3 10 15 20 25 30 35 40 45 50 Length, cm > 3 Fig. 53. Length and weight dis­ tribution of the sparsely rakered whitefish in Lake Stuorajavre. 0+ 1+ 2+ 3+ 4+ 5+ 6+ 7+ 8+ 9+ Age, yrs > 3 4 7 % 42% 37% 33% 28% 23% 19% 14% 9% 5% 0 % _o. IE1 0+ 4+ 8+ 12+ 2+ 6+ 10+ 14+ Age, yrs 20 18 16 14 12 > 10 3ос 8 Fig. 54. 6 Age distribution of the 4 sparsely (a) and densely 2 (b) rakered whitefish in 0 Lake Stuorajavre. Catalogue ofLakes in the Russian, Finnish and Norwegian BorderArea 105