, including integrated use, which allows using the same water resources both for fish farming and for other sectors of the national economy.
In contrast to basin farms, fish rearing in cages does not require forced water exchange and energy consumption for pumping water. Cage farms are located in large areas (not less than 30-50 ha and not more than 500-600 ha) and deep (5-6 meters) reservoirs with large reserves of local feed in the form of low-value fish, mollusks, zooplankton.
Gardens are installed in bays protected from the wind with an area of 50-200 m2 and a depth of 5-6 meters. In well-permeable cages of kapron divide, even with dense fish landing, the same physicochemical regimen is created as in the reservoirs in which they are installed. This makes it possible to select water bodies for different fish species with a temperature and hydrochemical regime favorable to them, which allows expanding, in comparison with ponds, the number of farmed objects due to high-value fish.
Objects of cage cultivation can be such valuable fish as salmon (Atlantic, Baltic, Ladoga, steelhead salmon, rainbow trout, etc.), whitefish (peled, Chidi whitefish, musk), sturgeon (sturgeon, bester, sterlet), carp, American catfish and others.
Bester, beluga at the age of three years in floating cages on reservoirs reach a mass of 3-3.5 kg, trout – 1.4 kg, two-year-old carp – 500 g. Output of marketable products from 1 m3 – 10-20 kg.
The use of artificial feed allows you to practice a fairly dense landing of fish in cages and get a higher yield of marketable products. The simplicity of design solutions, low costs and capital investments, the absence of the need for mechanical water supply, low operating costs contribute to the predominant development of cage fish farming.
Book Content Fish Farming.
Features of cage fish farms.
Gardens for growing fish.
Characteristics of cage cultivation objects.
Freshwater fish biology.
Salmon family fish.
Environmental impact on fish farming in cages.
Control over the hydrochemical and temperature conditions of water bodies.
Feed base and fish feeding.
Nutrient requirements of fish.
Growing carp in cages.
Sturgeon cultivation in cages.
Growing Russian sturgeon.
Breeding Siberian sturgeon.
Growing rainbow trout in cages.
Care for eggs during the incubation period.
Care for larvae and fry during growing.
Transportation of caviar, sperm, larvae, juveniles, commercial fish and producers.
Transportation of sperm and caviar.
The movement of juveniles.
Transportation of planting material and salable fish.
The most common freshwater fish diseases.
Brachiomycosis, or Gill Rot.
Dermatomycosis (saprolegniosis, achliosis).
Coccidiosis (coccidiosis enteritis).
Veterinary and sanitary measures for the prevention of fish infectious diseases.