Abstract
Analysis of biometric data of juvenile sockeye salmon caught during the run to sea in the channel from Nachikinskoe Lake was carried out in order to clarify the question of the minimum possible number of sclerites on the scales to the 1st annual ring. For the first time, the study of the features of the scale structure of juvenile sockeye salmon of different ages was carried out. The differences revealed between groups of individuals of different age categories are highly reliable not only in weight and length, but also in the total circuli number in the freshwater zone and circuli number to the first annual ring (6.0 ± 0.1 in yearlings, 3.9 ± 0.3 in two-year-olds); physiological explanation for these differences is proposed. On the basis of the scleritograms constructed, a comparison of other features of the scale structure of the juvenile migrants of different ages was carried out. The key characteristics obtained are recommended as clarifying criteria in reading the freshwater age of juvenile sockeye salmon in Nachikinskoe Lake.
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