Сергей Борисович Мустаев The paper provides information about the growth and development of somatic structures of two-year-old carp during the fattening period. In variant I, K-III compound feed was used (low-carb-monodiet), in variant II - Carp-38/12 (high-carb-monodiet), in variant III - K-III and Carp-38/12 (in different auto-feeders). The highest proportion of axial somatic structures was observed in fish of variant III (fish feeding on a selective basis) (P < 0.05). White muscles are also better developed in fish that eat complex feed (variant III). Compound feed Carp 38/12 does not increase the mass of white muscles (P < 0.05). The proportion of red muscles in fish that eat mixed feed with a low fat content (3.5%) is 45.5% lower than in variants II and III. The use of feed with different energy values and their combination in one pond affects the growth and development of the structure that determines the growth offish species - the axial skeletal muscles. At the same time, the two-year-old fish species that received the most energy-intensive diet were the most well-fed. Two-year-old carp that received feed with different energy content and complex composition grow differently. This is primarily due to the growth of muscles, which is evidenced by allometric coefficients. The highest values of this parameter featuring positive allometry, were observed in two-year-old carp that received two compound feeds from different feeders (white muscles b = 1.106; red muscles b = 1.499; all muscles b = 1.125). The bionic method of feeding fish in combination with feeds of different energy values provides for strengthened growth of one of the most important body structures - the somatic muscle system. It is not only a biological component of the body that ensures the welfare of animals, but also a high-quality food source.
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