Joint cultivation of fish and vegetable crops in an aquaponics system using floating beds

Comparative results of the cultivation of Silver crucian carp in conditions of aquarium circulation systems are presented, in one of which aquaponic cultivation of tomatoes and peppers on a floating bed in a fish tank was used. In comparison with the control, a significant improvement in hydrochemical parameters for dissolved oxygen and a group of nitrogen-containing compounds was noted in the experimental aquarium. The ratio of the specific formation as a result of the vital activity of fish and the absorption of nitrates by plants was 0,8 units. The results showed that for 1 kg of ichthyomass, 26 tomato plants or 34 bell pepper bushes can be planted on a floating bed. In the obtained fruits, the nitrate content turned out to be 2 times lower than the MPC for open and 4 times lower than the MPC for protected soil. The increase in the total ichthyomass of crucians in the experiment turned out to be 1,6 times higher, and feed costs 1,5 times lower than in the control. At the same time, the fish productivity of the aquarium with a floating vegetable garden increased by 9,7%.