СРАВНИТЕЛЬНАЯ ХАРАКТЕРИСТИКА КОРМОВ ПО БИОХИМИЧЕСКИМ ПОКАЗАТЕЛЯМ СЫВОРОТКИ КРОВИ ONCORHYNCHUS MYKISS (WALBAUM, 1792)

Abstract

The main reasons for the decrease in feeding efficiency are dietary inadequacy and poor quality of the feed, which leads to its suboptimal consumption and accumulation of residue, which, in turn, results in deterioration of the hydrochemical regime. This study presents the comparative analysis of two fish feeds in terms of their safe use for Oncorhynchus mykiss (Walbaum, 1792) feeding and their impact on water quality. The investigation was conducted on the rainbow trout individuals in the recirculating aquaculture system at the Aquaculture Center of the K.G. Razumovsky Moscow State University of Technologies and Management in 2021-2020 and involved the comparison of the feeds CRYSTAL (protein content 42.65 %) produced by Alltech Coppens and Basic PL 45/20 A50 (protein content 45.81 %) produced by BNBC (Belarusian National Biotechnology Corporation). Six test groups were included in the experiment: three groups were fed with Alltech Coppens CRYSTAL and the other three groups were fed with BNBC Basic PL compound feed. The biochemical characteristics of the rainbow trout blood serum have been identified using the blood taken from a caudal vein, and the hydrochemical characteristics of the water have been identified using standard procedures. A distinct relationship between the protein content in Oncorhynchus mykiss blood serum and protein content in the feeds has been found. The hydrochemical characteristics of the water in the recirculating aquaculture system over the course of the experiment remained within the normal range, with exception of iron that had been present before the experiment and did not have an adverse effect on the fish’s health.