The article presents the study results of the chemical composition of Cyprinidae and Percidae skeletal muscles from the Sot', Vopsha and Kast' rivers in the territory of the Yaroslavsky State Nature Reserve. The fish were ascertained for sex, stage of gonad maturity, and age. The total amount of water, dry matter, total lipids, protein, minerals, and nitrogen-free extractives (NFE) were determined in their muscle tissues. The study revealed significant differences in the content of final metabolic products in the muscles of individuals of the same species living in different rivers, which may be connected to the difference in food supply or with characteristics of hydrochemical composition of the reservoirs under study. It has been stated that the chemical composition of muscle tissues depends on the trophic status of aquatic organisms, their sex and age. On average, in the rivers the carpal skeletal muscles were superior to the perch muscular tissue in terms of total lipid content, but inferior to the amount of protein, ash, and NFE. As it was revealed, the female muscles contained more protein and fat, than muscles of males and juveniles. Reduction of dry matter and fat in the muscle tissues of roach, sabrefish and rudd (aged 4 to 5) can be associated with attaining puberty in fish. With age, a decrease of water was observed in Cyprinidae and Percidae muscles due to accumulation of dry matter. With ageing of the studied fish in their muscle tissues was found both the increased and decreased concentration of protein, total lipids, mineral substances and NFE. From the data obtained it can be inferred that the fish population of the rivers flowing through the territory of the Yaroslavsky State Nature Reserve exist in relatively favorable conditions.
The article gives the results of the study of the fatness and chemical composition of skeletal muscles of underyearling Esox lucius L., grown in different fish-farms of the Yaroslavl and Volgograd regions. The fish was measured, weighed; Foultin’s fatness coefficient was calculated. The amount of water, dry matter, fat, protein, minerals and nitrogen-free extractives were determined in the muscle tissue of the test specimens. In autumn yearlings of both fish farms approach 100 g weight, average body length being 19-21 cm. At the age 2+ pike juveniles of the Volgograd fish farm (sole trader - “Head of the Peasant farm Lozina Ya.V.”) overtake those grown in “Stimul” fish farm, Ltd. in Yaroslavl region in size and mass. However, Fultin’s condition factor in individuals of the Yaroslavl region was significantly higher than in the young from Ya. V. Lozina’s fish farm. There were no statistically significant differences between the water content, protein content, fat content, and nitrogen-free extractives in the skeletal muscles of pike underyearlings from different enterprises. Though, there was registered a significant increase in the amount of mineral substances in the muscle tissue of pike underyearlings from “Stimul”, Ltd ( p < 0,05). On average, muscular tissue of pike underyearlings from “Stimul”, Ltd was larger than that of Ya.V. Lozina’s fish farm in terms of nutrient content and energy value. The study results showed that fatness and chemical composition of the muscle tissue of pike yearlings is more influenced by the sufficient food supply than hydrochemical conditions of the pond.
The aim of this research was to study the dynamics of metabolism in the body of bream Abramis brama (L.) at different periods of the annual cycle: pre-spawning, spawning, post-spawning and feeding. The object of the study was 55 male and 53 female bream aged 9–13 years, to reduce the effect of age on the studied parameters. Individuals were measured, weighed, gender was determined, gonad maturity stage, age; the condition factor and organ indices were calculated. The content of moisture, dry matter, lipids, proteins, ash and nitrogen-free extracts (NFE) in the muscles, liver and gonads of male and female bream have been analyzed. The lowest coefficients of condition factor were found in bream during the autumn feeding season, the highest in males during spawning, in females before and after spawning. In the muscle tissue of male and female bream the content of metabolic products in the feeding period and before spawning differed slightly. In the spawning period, the muscles of males exceeded the muscle tissue of females in lipid content by more than two times. In the annual cycle of the bream, the ovaries contain more protein than the testes. The bream of different sex revealed differences in the intensity of metabolic processes during the maturation of gonads: in males, energy costs are more pronounced after wintering before spawning, while in females, during spawning. The main energy reserve in the form of lipids in the annual cycle changes more significantly in the body of male bream than in females. Ovarian maturation requires more metabolite reserves than maturation of the testes, however, males have increased expenditure associated with reproductive behaviour during spawning. Therefore, the total energy contribution to reproduction may be the same for female and for male bream. Bream’s liver and muscle tissue can serve as a source of energy during food shortages and during spawning. In the annual cycle, the condition factor of bream increases due to an increase in the moisture content in the muscles.
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