The ratio of blood serum protein fractions of individuals of yearling sterlet (Acipenser ruthenus) when used in the feed of dry biomass of larvae black lion flies (Hermetia illucens)

Currently, it is very important to find solutions aimed at improving the quality of fish feed, especially for sturgeon. There is an active search for alternative sources of feed protein and ways to increase the digestibility and digestibility of the traditional feed ingredients used. One of these alternative protein sources is the use of larvae of the black lion fly (Hermetia illucens). The use of dry biomass of black lion fly larvae was evaluated according to the blood of sterlet individuals - the amount of total whey protein, the ratio of protein fractions and the protein coefficient. Yearling sterlet (Acipenser ruthenus) kept in aquaculture conditions were used as research objects: 40 fish with an average weight of 145 ± 15.7 g were individually weighed to an accuracy of 0.1 g and placed for cultivation in fiberglass pools measuring 1.1 × 1.1 m in 2 groups (control and experiment). The fish were fed according to their ability to eat during the day with an interval of 4 hours. During the entire study period (30 days), water quality parameters were checked, including daytime temperature values with a minimum of 24 °C and a maximum of 27 °C (the average temperature was 26 ± 0.97 °C). Other measurements varied as follows: oxygen concentration of 7.9-9.4 mg/l and saturation of 81-99%. As a result of the research, a positive experience was gained. The level of total whey protein and its fractional composition in sterlet from the experimental group were close to the norm typical for sturgeon, while in fish from the control group there was an increased level of γ-globulins and a decrease in protein coefficient, which may indicate a strain on the body's protective and adaptive forces, unlike in fish from the control group from fish from the experimental group, where the proportion of this fraction was within the normal range.