Conversion of forage components at rearing in recirculating aquaculture systems
Journal Title: Наукові горизонти. Scientific Horizons - Year 2018, Vol 67, Issue 4
Abstract
The quality of fishery products grown in recirculating aquaculture systems (RAS) is formed under the influence of water quality indicators and quality of forage. The search for more effective water treatment technologies in this field is related to the need to reduce the growing current costs of fish products and raising their quality. The purpose of the research is to develop a purification scheme that involving groups of forage organisms which are able to use typical pollution in RAS as a nutrient substrate. This approach to the restoration of water composition corresponds to the principles of the concept of integrated multitrophic aquaculture (IMTA). Efficiency analysis of the treatment organisms usage to the processes of removal and transformation of pollution in RAS was carried out, that have feed value for fish. Selection of aquatic organisms for the combined cultivation with fish was carried out based on the analysis of self-purification processes of natural water, biochemical and metabolic features of certain aquatic organisms. The potential load on the recirculation system by compounds of nitrogen and phosphorus has been investigated as a result of forage insertion. The cultivation expediency of aquatic plants, stomach molluscs, oligochaetes and higher crustaceans is substantiated as cleansing agents representatives in water treatments facilities based on the developed technology. It is determined that the RAS reclaimed ammonium nitrogen is assimilated into the biomass of plants, which is transformed into their proportional growth, on the basis of experimental studies and analytical calculations. Thus, the bulk of the dissolved fish metabolites from the form of contamination passes into protein-accessible protein compounds available to fish. undissolved waste can be transformed into feed biomass organism up to 50% of undissolved waste In the biological treatment of recycled water by developed biotechnology. In this case, the increase in the biomass of mollusks may amount to 20-45% of the total amount of undissolved organic contaminants trapped in an aerobic bioreactor with an inert carrier. Large-dispersed contaminants derived from the closed water circuit can be used as a nutrient substrate for aquatic oligochaetes. Such processes are advisable to be carried out in open structures for the stabilization of waste.
Authors and Affiliations
S. Konontsev, L. Sabliy, M. Korenchuk
Keywords
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- EP ID EP631618
- DOI 10.33249/2663-2144-2018-67-4-57-64
- Views 224
- Downloads 0
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