The main methods of intensification of pond fish farms are feeding fish and fertilizing ponds with increased stocking density of fish per unit water area. Natural forage base of the pond with increased stocking density of fish was not enough; she can no longer provide favorable conditions for feeding and growth of fish. In order for the fish planted in the pond on the increased norm, grew well and by the autumn had reached the standard weight, it is necessary to additionally feed her fodder mixtures and to simultaneously increase the stock and utilization of natural fish food by fertilizing the ponds, application of mixed landings of fish and other ways.

Range of feed for pond fish is quite large. They can be divided into feed of plant and animal foodstuffs. As plant feeds for fishes used most often wastes of different crops (barley, rye, wheat, corn) and legumes (lupine, soybeans, lentils, peas). Grain feeds rich in carbohydrates, legumes – proteins. Apart from them, are widely used for feeding fish different kinds of food, and even housing polikarpovich oilseed meals and cakes: sunflower, hemp, safflower, rapeseed, cotton, flax, etc.

Of feed of animal origin in the composition of Korovina for fish, you can include poultry, meat, shellfish, frogs, tadpoles, chrysalis of the silkworm (silk-spinning mills waste), meat-bone and fish flour, pests of plants, etc.

Different types of feed for fish have different nutritional value and are characterized by different feed coefficients. Feed ratio fish farmers called the number of pounds of feed which is necessary during the growing season to produce 1 kg weight gain of fish (in excess of the increase resulting from the consumption of natural fish food). The actual feed efficiency of the same feed may vary within certain limits (for example, from 3 to 5 or 4 to 6) depending on a number of factors: the magnitude of natural fish productivity, temperature, hydrochemical regime of the pond, age and condition of the fish, methods of cooking and distribution of food and some other reasons. Carp it is best to feed and to digest food when the water temperature is 23-29°; at this temperature, the feed conversion ratio is the lowest. When the temperature of the water feeding intensity of carp decreases and the feed conversion ratio feed usually increases. Table 20 shows the average (normative) feed ratios of the most common feed for pond fish.

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