To the scleritometric characteristics of grayling scale in the Pechora basin

The scleritometric characteristics of grayling scale from several tributaries and the main channel of the rivers Usa and Pechora is present. Number of sclerites in growth area varies in terms of fish catch. The area of growth this year on the scales of the fish which was catch early (May) is not expressed. Growth area of on scales grayling caught in June and July, expressed clearly and averages between 2.5 and 5.8 sclerites depending on the population and specific time of collection. The number of sclerites in growth area at the end of the season (August-September) approaches to the number of sclerites in the relevant annual zones (9-11 sclerites). Maximum of sclerites is observed on the second and third years of life, and after the fourth year it declines which corresponds to the growth rate of fish. Consistent pattern of sclerites on grayling scales is the same type in different parts of the Pechora basin. Number sclerites in annual zone in different samples varies greatly in the first year, in the second - to a lesser degree, in the older groups diversity hardly observed. Thus on-time, the differences in growth rate with age smoothed. Regularities between the number of sclerites in annual zones and habitat (in the direction from north to south) diverse populations of grayling has not yet revealed.