Comparative fishery characteristics of underyearlings of two lines of breeding mirror carp of the fourth and fifth generations

The article presents the results of a 10-year study of fishery indicators of two lines of breeding Belarusian mirror carp of the fourth and fifth generations. Each of the lines includes five generations.
High variability of body weight and survival of youngsters was noted between the fourth-generation generations. The average weight of fingerlings of the first line averaged 29.0 g with fluctuations from 17.7 to 39.2 g, in the second line the average weight of fingerlings is higher and is 44.7 g (38.0–48.3 g). The average survival rate of youngsters of the first line averaged 39.8 %, with fluctuations from 27.3 to 55.8 %, in the second 34.2 % with fluctuations of 33.9–34.4 %.
In the fifth generation, the weight of the fingerlings varied significantly less than in the fourth. Fluctuations in the first line ranged from 32.8 to 33.8 g, in the second from 26.3 to 31.6 g. The survival rate of fifth-generation fingerlings mainly varied from 28.0 to 44.0 %, with the exception of the third generation of the second line, in which this indicator is significantly higher (65.0 %). In general, the comparison of youngsters of two generations indicates an increase in average body weight and a decrease in the variability of this indicator in the fifth generation compared to the fourth. On average, in the fourth and fifth breeding generations of the Belarusian mirror carp, the level of average weight and survival of fingerlings meets regulatory requirements.

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