The stage of gonad development was estimated in salmon in their second year of life, in lower growth rate group that was not smoltifying in the first season. The mean fork length of females (149 individuals) was 10.25 cm, males (145 individuals) 10.45 cm. The gonadosomatic index ranged from 0.03 to 0.38 (an average of 0.17) in females, and from 0.01 to 6.22 (an average of 0.37) in males. All female gonads were at the similar stage of gonadal maturity. The most advanced in development oocytes were found in protoplasmatic growth phase, with a ring of basophilic cytoplasm situated in the peripheral cytoplasm. The diameter of the oldest generation oocytes varied between 78.8-145.0 mm (an average of 106.73). The stage of testes development was diverse. The juvenile males possessed only type A spermatogonia in the lobules whereas the maturing ones had cells at the beginning or at the late phases of spermatogenesis. The first group represented 72.4% and the second 27.6% of population, respectively.

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