METHOD TO PREVENT WATER "BLOOMING" WITH THE HELP OF REPRESENTATIVE OF ABORIGINAL FISH FAUNA-YOUNG ROACH-USING ARTIFICIAL FLOATING SPAWNING GROUNDS-ISLANDS IN CENTRAL RUSSIA Russian patent published in 2024 - IPC A01K61/10 A01K61/60 

FIELD: fishing and fish farming.

SUBSTANCE: invention relates to fishing in the field of fish industry and can be used for biological reclamation of water bodies of both fishery and recreational value. Method for prevention of "blooming" of water with participation of representative of aboriginal fish fauna—young roach—when using artificial synthetic floating spawning grounds-islands consists in involvement of aboriginal widespread representative of ichthyofauna—roach. At that, number of young roach increases due to reproduction on floating artificial spawning grounds-islands, installed on areas of water bodies with the highest concentration of phytoplankton, including open deep-water areas, for the main vegetation period of mass development of microalgae. Area of artificial spawning grounds and the number of roach spawners to reduce the concentration of phytoplankton by the value of its biomass are calculated by formulas (1) and (2) Sn = B_f x (P/B_season) x W x K_E x (K₃/100) / m x 100/V₁ x 100/V₂ / C₁ (1) B_XY = Sn x C₁ / N_y x XY x M (2), where Sn is the area of spawning grounds for neutralizing phytoplankton in a water body, a section of a water body, m²; B_f—neutralized value of biomass of phytoplankton, g/m³; P/B_season is the average seasonal production coefficient of phytoplankton biomass conversion into production; W is volume of water body, section of water body, m³; K_E—coefficient of efficiency of using food for growth for food chain "phytoplankton–fish"; K₃—average for this water body and season share of use of fodder base for food chain "phytoplankton–fish", %; m is the average weight of the reproduced roach fry, g; V₁—coefficient of output of young roach from larvae of roach, %; V₂—coefficient of roach larvae output from spawn, %; C₁—number of laid eggs per 1 m² of artificial spawning grounds, mln pieces; B_XY—biomass of fish producers for production of estimated amount of eggs, t; N_y—number of females, individuals; XY is a coefficient for determining the number of producers taking into account the sex ratio; M is average weight of producers, g.

EFFECT: invention ensures reduction of phytoplankton concentration and prevents “blooming” of water body.

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