Influence of protein concentrates in compound feeds on hematological parameters of fish

In the field of feeding aquaculture objects, it is important to search for alternative feed sources. The purpose of the research was to evaluate the effect of high-protein feed concentrates on the growth performance and hematological composition of rainbow trout. Research was carried out At the enterprise IP Kalmykova I. O. in order to study the protein concentrate Gorlinka in compound feed for rainbow trout. The trout of the control group were fed compound feed with sunflower meal, and the fi sh of the 1st, 2nd and 3rd experimental groups were fed compound feed in which sunflower meal was replaced with Gorlinka concentrate – 50 %, 75 and 100 %, respectively, for the groups. Research on the introduction of the protein concentrate Agro-Matic into the compound feed of rainbow trout was carried out under the conditions of the Scientifi c Research Center “Breeding of valuable sturgeon breeds” of the Volgograd State Agrarian University. The fish of the control group received the main diet with fish-meal, and in the diet of the trout of the 1st, 2nd and 3rd experimental groups, 25 %, 50 and 75 % of fish-meal were replaced with Agro-Matic concentrate. It was found on the base of results obtained that the introduction of Gorlinka concentrate into the compound feed formulation contributed to the increase in the overall gain in live weight of fi sh by 2,83–6,93 %. The use of Agro-Matic concentrate in compound feed had a positive effect on the live weight of fish; it increased by 1,29–5,26 %. The content of total protein in the blood serum of fish from the experimental groups relative to the control increased by 0,65 %, 1,64 and 3,27 % with the introduction of the Gorlinka concentrate into the diet, and the Agro-Matic protein concentrate by 1,01 %, 2,44 and 3,55 %, respectively, which is due to balance of the recipes. When studying some indicators of fish blood we found that with a balanced diet the biochemical composition of trout blood is quite constant and is within the physiological norm for salmon fish.