ABSTRACT.
Further growth in the production of fishmeal, which is the protein basis of fish feed, is constrained
by limited volumes of aquatic biological resources of the world ocean. Modern science makes it possible to produce
protein from a wide range of raw materials. One of the promising areas at present is the production of protein from natural gas and its homologues, as well as from associated petroleum gas, coal mine methane and biogas burned in oil
fields. At the same time, the presence of copper and iron is necessary for the functioning of enzymes responsible for the
oxidation of methane. Copper has the ability to accumulate in tissues, especially in the liver, which serves as the main
depot for it and is an indicator of the availability of this element. The work on the effect of a possible residual amount
of copper during feeding, with the replacement of fish meal with 94% of a microbial protein concentrate grown on methane, was carried out in the conditions of the ASTU aquatic complex on fingerlings of the Nile tilapia. Compound feed
produced by LLC BIFF was used as a control feed. At the same time, the analysis of fish-breeding biological, physiological parameters, the content of trace elements in the organs and tissues of fish was carried out. The absolute increase
in the experimental group was 6.41 g higher than the control group, and the relative increase was 0.05%. The survival
rate of fish in the two observation groups remained at the level of 100%, with the overall optimal cultivation parameters. A number of physiological indicators also indicate the positive effect of feeding with KMB. Thus, the hemoglobin
content in the control group of fish at each stage was lower than the experimental one - by 10.1-14.2 g/l. During the
growing process, the ESR of the experimental group decreased to optimal values not exceeding 2.5 mm/h. Since the liver is the main depot for copper, a high Cu content was typical for both experimental groups, but despite this, data on the
growth and physiological state of fish did not show a negative effect.
KEYWORDS: microbial protein, feeding, tilapia, copper, growth, compound feed.
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