Reproduction of Atlantic salmon (Salmo salar L.) (Salmoniformes, Salmonidae) (freshwater forms) in remediated spawning and rearing section of Suna river

The distribution density of juveniles in DDP after remediation and the number of producers of freshwater salmon are studied. In 2005, the density of settlements of juveniles in DDP was 3,7 ind./100 m 2, in 2006, 49,7 ind./100 m 2 juveniles were represented by three age groups (0 +... 2 +). Further, the density of settlements gradually increased reaching a maximum in 240 ind./100 m 2 in total for all age groups in 2008. In the future, the density of settlements varied at the level of 194,3 ind./100 м 2 in 2012 and 192 ind./100 m 2 in 2013, with the marked decrease to 150,6 ind./100 m 2 in 2012. During the period of observation the age composition of juveniles stabilized. On linear and weight parameters juvenile salmon of the river Suna in the age groups of 0+ and 1+ exceeded juveniles from other tributaries of Onega (Shuya, Coombs, Nemina, Pyalma) and Ladoga lakes (p. Hiitola). The growth rate of the young salmon from Suna river is comparable to the growth rate of the juvenile from other tributaries of Lake Onega. The daily gain of fingerlings is 29,54 mg/day and 140,36 mg/day for parr (1+). Annual participation in spawning involves 45 fish species coming from the waters adjacent to the Waterfall Kivach.