Investigation of microbiological components in a closed-loop installation
https://doi.org/10.36038/0131-6184-2025-1-102-109
EDN: SAGWFG
Abstract
The issues of microbiocenosis formation in a model closed-cycle installation (RAS) with sturgeon fish are considered. Data on sanitary indicator microorganisms in the fish tank and biofilter are presented. Microorganisms involved in the process of water purification from nitrogenous metabolites of fish are considered. It has been shown that in RAS without the use of disinfecting technological units (UV lamps, ozonizers), a microbiome develops, forming the sanitary characteristics of water and bacterioplankton participating in the nitrogen cycle. It was revealed that in different layers of the biofilter the representation of microorganisms is different: the highest value is in the surface layer of the biofilter, where the organic matter filtered by the load is collected under conditions of good aeration. A similar picture was observed in saprophytic and coliform bacteria. It is noteworthy that if in natural waters saprophytic bacteria make up 0.01-0.1% of the total number of bacteria, then under RAS conditions these ratios are 76.9-89.5%. Ammonifiers, which begin the process of decomposition of metabolites and organic contaminants, were intensively represented in the surface layer of the biofilter, in the active mixing zone of the middle part of the biofilter – the zones of greatest aeration. The observed pattern of distribution of nitrifiers was leveled, their number did not exceed 2.6 thousand CFU/ml.
About the Authors
M. L. Kalaida
Kazan state power engineering university
Russian Federation
Russian Federation
Marina L. Kalaida – Doctor of Biological Sciences, Professor, Head of the Department of Aquatic Bioresources and Aquaculture
420066, Kazan, Krasnoselskaya St., 51
L. K. Govorkova
Kazan state power engineering university
Russian Federation
Russian Federation
Lada K. Govorkova – Candidate of Biological Sciences, Associate Professor, Associate Professor of the Department of Aquatic Bioresources and Aquaculture
420066, Kazan, Krasnoselskaya St., 51
R. R. Safiullin
Tatar branch of the Federal State Budgetary
Institution «VNIRO»
Russian Federation
Russian Federation
Rashit R. Safiullin – Doctor of Agricultural Sciences, Head
Republic of Tatarstan, Kazan, st. Alexandra Popova, building 4A
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Review
For citations:
Kalaida M.L., Govorkova L.K., Safiullin R.R. Investigation of microbiological components in a closed-loop installation. Fisheries. 2025;1(1):102-109. (In Russ.) https://doi.org/10.36038/0131-6184-2025-1-102-109. EDN: SAGWFG
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