Efficiency of the supplementation of age-2 carp (Cyprinus carpio Linnaeus, 1758) diet with saponite and analcime

Purpose. To perform a comparative analysis of the effect of saponite flour and analcime added to the basic diet of age-2 carp on physiological-biochemical parameters of fish organism. Methodology. Aquaculture, ichtyological, and statistical methods were used for the study. The object of the study were age-2 carp. The weight content of protein was determined by Kjeldahl method, the fat content – by S.V. Rushkovskiy method in a Soxhlets extraction apparatus. Quantitative determination of metal concentrations in pond fish tissues were determined by direct absorption of the solution into propane-butane-air flame with the aid of atomic absorption spectrophotometer S-115-M1 in the laboratory of the Institute of Fisheries. Findings. Studies on the determination of meat nutritional value and heavy metal concentrations in age-2 carp muscles have been performed. Addition of 3% saponite flour and analcime to carp diet during the entire rearing period resulted in an increase in age-2 carp average weight by 12.1% and 9.7%, fish productivity – by 11.9% and 9.9% compared to the control. Feeding of fish with a feed mixture supplemented with analcime contributed to an increase in protein content in carp muscles by 7.5% and fat – by 22.5%. At the same time, supplementation of the diet with saponite flour resulted in an increase in fat content by 16%. Feeding of fish with saponite flour and analcime resulted in a decrease in the contents of lead in fish muscles by 77.7% and 78.7%, cadmium – by 1.3 and 2.4 times compared to the control. Originality. Minerals of volcanic origin, saponite flour and analcime, were added to age-2 carp diet for the first time. Their effect of productive parameters, food value of fish meat and its chemical composition were determined taking into account sorption and ion exchange properties. Practical value. The results of the work are the basis for planning rational feeding of age-2 carp and increasing the productivity of ponds