Some features of chum salmon biology(Oncorhynchus keta)in Inya river(the sea of Okhotsk)

摘要

Some biological indicators of chum salmon producers that spawn in the Inya river(Khabarovsk Territory,Sea of Okhotsk)in 2013-2014 have been studied.A comparative analysis of dimensional characteristics showed that in 2013,the range of changes in the length of chum salmon was higher(from 51 to 73 cm),while the dynamics of changes during the spawning season differed.Weight indices of chum salmon were higher in 2013.During the spawning season,both in 2013 and 2014 the average values of the mass of chum salmon decreased(in 2013 from 1.5 to 5.5 kg,in 2014 - from 2.0 to 5.0 kg).The chum salmon was harvested at the age from 2+ to 5+ years in 2013-2014.Fish prevailed at the age of 3+ years.The average value of the individual absolute fecundity was higher in 2013(2412 ± 62 units)than in 2014(2180 ±83 units)