Characteristics of the first selective breeding generation of the antoninsko-zozulenets intrabreed type of Ukrainian carp breeds in 4th and 5th years of life

Purpose. To provide a comprehensive characterization of the first selective breeding generation of the Antoninsko-Zozulenets intrabreed type of Ukrainian carp breeds in the 4th and 5th years of life based on productive and biological parameters. Methodology. The material for the study were age-3+ and 4+ individuals of the Antoninsko-Zozulenets intrabreed type of carp. The main productive and biological parameters were studied during spring valuation and autumn harvest according to generally accepted methods in fish farming. The exterior assessment of the experimental groups was carried out for following parameters: weight, length, height and body girth. Measurements were made with a centimeter tape with an accuracy of 1 mm. Individual weighing was carried out on electronic commercial scales with an accuracy of 1 g. The main exterior indices were analyzed and determined based on the measurement results: girth index, body length to height ratio, head length to body length ratio. Findings. The conducted study showed that the yield from wintering was in the range of 91.31–92.25% for age-3, and 90.68–91.78% for age-4 fish. At the same time, weight loss was 6.43–7.65% in the third year of life and 5.74–7.46% in the fourth year of life. The survival rate of age-3+ fish was 95.3 - 96.6%, age-4+ 95.9 - 97.2%. The average weight of age-3+ framed and scaled carps was 3835.0±77.27 g and 3740.0±120.50 g, respectively. The weight gain during the season was 2.0 kg in scaled and 2.1 kg in framed carps. The average individual body weight of age-4+ fish was on average 5060.0±110.54 g for framed individuals and 4900.0±117.26 g for scaled ones. The weight gain of scaled Antoninsko-Zozulenets carp was 1.8 kg, framed carp - 1.9 kg. According to exterior parameters, age-3+ and age-4+ fish had higher values of the body length to height and condition factor, but were inferior in terms of the head length to body length ratio compared to their peers with the scaled cover. Originality. For the first time in the conditions of Ukraine, a comparative analysis of fish productive and biological parameters of the replacement brood stock of the first selective breeding generation of the Antoninsko-Zozulenets intrabreed type of the Ukrainian framed and scaled carp breed was carried out. Practical value. The use of brood fish of a new intrabreed type with defined features of the genotype will allow obtaining new promising lines for industrial cultivation at different levels of intensification of aquaculture and in different climatic zones as well as hybrids between geographically isolated populations.