The following data may illustrate the changes in the number of the crayfish population. 99 % of captured crayfishes were exported, so in 1927 - 611 tones of crayfishes were exported, in 1938 as many as 73, whereas in 1952 only 84 tones. Since 1970s the crayfish catch did not exceed 10 tones and continued to decline. Since 2000 as the noble crayfish protection was introduced, the annual crayfish catch has not exceeded 1 tone including an illegal catch. At present most of legally captured noble crayfishes are used for restitution, i.e. reconstruction of the population of this species.