DESCRIZIONE
The invention relates to a method of rearing feed fish in recirculation plants, where the fish are exposed to water-filled tanks and fed regularly, maintaining water parameters and water supply characteristics. The amount of water supplied to the nitrification plant is set in a range between 7 and 14 times the nitrification plant per hour, the flow rate of the surface of the nitrification plant being between 0.17 and 0.48 from the height of the nitrification plant per minute, and the amount of water delivered to the denitrification reactor is adjusted between 9 and 1.2 times the contents of the denitrification reactor per hour, with the flow rate of the surface of the denitrification reactor being between 0.029 and 0.031 meters from the height of the denitrification reactor, meters per minute is. The water temperature is maintained in the range between 11 and 28 degrees Celsius. The water pH is maintained in a range between 7.0 and 7.2. The oxygen concentration in the water at the entrance to the nitrification plant is maintained at least 4.4 mg / liter and the oxygen concentration at the inlet of the denitrification reactor is maintained between 0.9 and 1.2 mg / liter. The water is continuously filtered mechanically. The fresh water is conveyed from the outside into a ventilation channel with a delivery rate between 0.5 to 0.9 times the content of the nitrification system per day. The water is irradiated with UV light at an irradiation intensity between 40 and 90 mJ / cm 2, the UV wavelength range being between 205 and 315 nanometers. The water pH is adjusted by adding caustic to the water.