Combined aquaponic-hydroponic cultivation of lettuce allowed us to obtain a significantly large mass of plants in comparison with aquaponic and hydroponic models of cultivation. This figure is exceeded at the second site (where it was used only aquapony water) at 28,0 % and the third plot (where it was only used hydroponic solution) was 10,9 %>, or respectively 40 and 15 g. Combined aquaponic-hydroponic mode, thus, allowed to obtain 1 m 2 of the installation 8,282 kg of vegetative mass of plants of lettuce, which is 2,761 kg more than in the traditional mode aquaponics (second plot) and on 0,903 kg more than in hydroponic mode (third phase). The level of profitability of production of vegetative mass of lettuce on the first plot has made 116,9 %>, 85,7 and 22,9 % higher than the second and third plots respectively. The average daily weight growth of clarid catfish aged 30-75 days in both groups of basins were not significantly different. In aquaponic system within 45 days they received the increase of living mass of animals at 456 g more than in the fish recirculating system. This is due to higher preservation of juvenile clarid catfish in aquaponic install was 0,5 %. Profits from the sale of products generated in the combined operation of the system was calculated for 1 m 3 of water environment 879,92 rubles, which is 66,94 rubles, or 8,2 % higher than from the sale of products obtained in aquaponic mode. Profitability is also higher in the first variant 1,9 %.
recirculating, fish recirculating system, aquaponics, hydroponics, airbreathing catfish, lettuce plants, organic products
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