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

Fig. 63. Vertical distribution of the concentrations of Ni, Cu, As, Pb and Cd (цд/д, dry weight) in the sediment core from Lake Kantojarvi. Fig. 64. Distribution offish spe­ cies in Lake Kantojarvi. 20 jLlg/g 40 (J-g/g 0.3 JLlg/g 3.2.3. Hydrobiological studies Ichthyofauna. Studies on the fish com­ munity of Lake Kantojarvi were con­ ducted in 2005. The most common species in the lake are: whitefish (Coregonus lavaretus) and perch ( Perea fiuviatilis). Pike ( Esox lu - cius) is caught occasionally (Fig. 64). Grayling ( Thymallus thymallus), burbot (Lota lota), minnow ( Phoxinus phox i­ nus), and nine-spine stickleback ( Pun ­ gitiu s pungitius) obviously also inhabit the lake. The low fish population in the lake is probably concerned to the small size of the lake, and its proximity to settlements and subsequent risk of over-fishing. Sparsely rakered whitefish inhabit the lake (up to 30 gill rakers). Due to the pres­ ence of large fish individuals (weight 1530 g and length 44.3 cm), the mean size and weight of whitefish are 24.3 cm and 271 g, respectively. The bulk of the whitefish population consists of fish with a length of 15-20 cm, and weight of less than 200 g (Fig. 65). The age distribution of the whitefish is dominated by 2-year old fish (more than 60%), and fish older than 7-8 years are occasionally caught (Fig. 66). In the sex distribution, females predominate over males (1.3:1). 118 Catalogue of Lakes in the Russian, Finnish and Norwegian BorderArea