Effect of biocomposts use on the results of commercial two-year-old carp cultivation in polyculture

The effectiveness of 2 types of composts for the fish industry was assessed on the basis of main communities of living organism’s development and the yield of fish products in ponds. It was established that their use reduces the cost of feeding fish and expensive fertilizers, and also makes it possible to fertilize the categories of ponds where the use of manure is prohibited.
Most of the standardized parameters when adding compost mixtures did not exceed the established standards.
In the variants where the greatest development of phytoplankton and zooplankton communities was achieved, biomass parameters exceeded the controls by 2–3 times. When using compost mixtures in ponds, the dominance of green algae (21,6–73,8 %) and copepodit stages of copepods (47,3–53,6 %) was noted, among macrozoobenthos — chironomid larvae.
The introduction of the developed biocompost mixtures into the ponds made it possible to increase the natural fish productivity by 41,1–60,0 % compared to the control not fertilized ponds, as well as to increase the yield of fish production by 25,5–96,8 %.

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