The object of study - the muscles tissue of bony fishes. The aim of the study – to study the microscopic muscles structure of individual species of bony fishes. Research methods: anatomical, histological, histochemical, morphometrical, statistical. Scientific novelty: for the first time the specific features of the structural organization of corpora muscles were established: rib eye, superficial and deep lateral muscles, rectus abdominis muscle, internal oblique muscle and the caudal fin's flexor of the scaly carp. The peculiarities of the microstructure of superficial and deep lateral muscles (the location of muscle tissue, the localization of red and white muscle fibers and adipose cells) were established in the Russian sturgeon, paddlefish, rainbow trout, pike usual, scaly carp, motley silver carp, white amur, usual catfish and usual pike perch. For the first time the comparative assessment of changes in muscular tissue (the diameter of muscle fibers and adipocytes, the myomeres' and myoseptums' width) in the superficial and deep lateral muscles with the carp's increasing age was established. The differences between the organization of muscle fibers, of the superficial and the deep lateral muscles of some species of bony fishes were discovered. For the first time the characteristic of a distribution of an adipose tissue in the superficial lateral muscle of some species of chondrosteans (paddlefish, Russian sturgeon) was given and compared with bony fish (rainbow trout, usual pike, scaly carp, motley silver carp, white amur, usual catfish and usual pike perch). For the first time in the domestic fisheries the structural organization of the red and white muscles of representatives of ichthyofauna, which can carry out long migrations (sturgeon, paddlefish and salmon) was analyzed, as compared to the nonmigratory ponds' fish of the Ukraine's forest steppe (spike, catfish, perch, carp). Implemented: the results are implemented in the scientific and academic work at the National University of Life and Environmental Sciences of Ukraine, at a research center of biosafety and environmental control of agroindustrial complex' resources of Dnepropetrovsk State Agrarian University, at Taras Shevchenko National University of Kyiv, at Southern filiation of National University of Life and Environmental Sciences of Ukraine "Crimea Agrotechnology University", at Rivne State Humanitarian University, at Poltava State Academy of Agriculture, at Dnepropetrovsk State Agrarian University, at Bila Tserkva National Agrarian University. The materials are listed in the information sheet of the Rivne State Center of scientific-technical and economic information. The microphotographs' atlas was developed. The branch of use: Veterinary Medicine.
