Exterior indicators of producers of black amur, grown in the climatic conditions of Belarus

It was revealed that after wintering, the exterior indicators of the producers of the black Amur were satisfactory and met the standards for the formation of repair and breeding herds. The absolute total length of the selected individuals of the repair — brood herd of the black Amur varied from 98 cm to 118 cm, averaging 104.3±1.93 cm, the length to the end of the scaly cover varied within 83-101 cm, with an average value of 90.9±1.81 cm. The weight of the same fish varied from 8.6 kg to 16.7 kg, which averaged 11.77±0.78 kg. The black cupid has the highest coefficient of variation in body weight (20.97 %). All absolute morphometric indicators characterizing the length, width and height of various body parts were increased in the group with a higher average weight. The variability of these characteristics in the black Amur of the population from the «Selets» fish farm is insignificant (coefficient of variation 3.85–8.70 %). Fulton fatness coefficients characterizing the physiological state of fish after wintering in most of the examined individuals of the black amur (80 %) were at an acceptable level for this species and age of fish, varying within 1.47–1.75 %. The index of progonicity in the examined black amur was characteristic of progonistic fish species such as the black amur (4.04–4.59 units. with an average value of 4.30 units) In general, the level of variability in the progonicity index turned out to be low and amounted to 3.85 %, and the variability of the variation series on this basis can be considered insignificant. The heterosexual representatives of the repair-brood herd of the black Amur were characterized by pronounced sexual dimorphism. The same-aged females were noticeably superior to males in body weight (13.7±0.81 kg and 9.83±0.48 kg, respectively) and some external indicators, such as the fatness coefficient (1.58±0.08 % and 1.52±0.03 %), girth index (60.59±1.20 % and 55.48±0.92 %), high-back index (23.51±0.55 and 22.70±0.44 %).

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