Abstract

The gonadosomatic index of Orconectes limosus was investigated monthly during the whole year. Male and female gonadosomatic indices (GSI) were found between 0.11 and 0.72 % and between 0.25 and 6.15 %, respectively, with a minimum in July and maxima for males in September and for females in April. A difference was found in proportions of testis and vas deferens in the male reproductive organ during the year. The size of oocytes in ovary increased from 0.2 mm at the beginning of the reproductive cycle to 1.8 mm immediately before laying. Number of eggs in the ovary was found 140.8±51.63 (76 – 290). The ovary was of brown colour for most of the time, while white in June and July and orange in August and September. Mating started in October and continued through the winter. Laying took place in mid April.

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