The article is devoted to the study of the dependence of annual increments of fish scales from solar activity. We have found the degree of variability between scale characteristics, the linear annual increase and the number of sclerites in annual increase and solar activity is high enough. Both parameters scales have a high correlation with fluctuations of Wolf numbers. We proposed in assessing health Baikal omul include solar rhythm acknowledge and incorporate them into research based on studies of somatic growth.