SU1237135A1 - Method of growing fish - Google Patents

Description

I

The invention relates to fishchurch farming, namely pond fish farming, and can be used in different climatic zones to obtain high marketable production of carp fish species.

The purpose of the invention is to reduce fish losses and increase the yield of marketable products. In addition, when implementing the method, there is a place for the complete use of feed resources due to the extension of the feeding period and the growth of fish, as well as the preservation and use of the autumn generation of feed hydrobionts,

The use of this method will prevent the death of fish in the winter period by eliminating traumatization and stressing of the fish during the first year of cultivation, as well as increase the operating efficiency of the pond fund of fish farms.

The method is carried out as follows.

The larvae of fish obtained after cubing are grown in fry ponds with a landing density of 500 thousand pieces / ha to a fry stage weighing 0.5-1.0 g. Further cultivation is carried out in a feeding pond with a non-freezing depth 90-100 cm

Before stocking a complex of ameliorative measures is carried out. The density of planting of fry in feeding ponds is 10-12 thousand pcs / ha. Fish are kept in winter in those feeding ponds. After the ice has melted and the water column above 6 C is heated, the fish in the pond is fed with granulated feed, for example, recipe K-110-1 at the rate of 0.5% of the fish weight. With an increase in water temperature, daily doses of feed increase to 4% by weight.

Thus, the total period of fish breeding in feeding ponds is 15-17 months. The yield of marketable fish from planting juveniles is 90%.

Growing fish larvae in fry ponds to 0.8–1.2 g of the stage of a fully formed organism (fry) allows you to: ensure a high survival rate in all subsequent stages.

When the density of landing of larvae is 500 thousand pieces / ha, the young are the most sex.

five

0

50

0 5

0

five

352

but provided with natural food with zooplankton biomass of 30-50 mg / l. The density of planting of fry in the scum ponds, which is 10–12 thousand pieces per hectare depending on the fish farming zone, allows creating an acceptable ratio between the environmental conditions and the physiology of the fish, which in turn reflects on a high growth rate.

The content of fish in the same ponds makes it possible to lengthen the feeding period in autumn and spring due to the feed resources of the pond, when the temperature of the water is higher than 5-6 ° C, and also due to the time that, with the traditional technology, is spent on fishing, overexposure and transplants.

In the table, the results of growing commercial carp in 1 fish farming area are presented with known technology and with the proposed method.

Physiological and biochemical parameters of wintered fish indicate a high viability of planting material grown by the proposed method.

As a result of using the method of growing fish in ponds without autumnal descent, the yield of carp marketable products in the monoculture was 33 centners per hectare, which is more than 2 times higher than the products obtained in feeding ponds in 1 area of fish farming for the same period. The use of the method eliminates the injury and stress of fingerlings during transplantation from wintering ponds, minimizes the likelihood of the occurrence and spread of fish disease, reduces fish losses during the wintering process, ensures an earlier start of active feeding and growth of fish in the second year of growth and reaches high fish products: activity, I

Example. Fish larvae, obtained after incubation, were grown in a fingerling pond with an area of 0.07 ha, a depth of 0.7 m, and a landing density of 500 thousand, units / ha to 1.0 g. Further cultivation was carried out in a feeding pond with a non-freezing depth of 100 See. Before stocking a 6bLTr pond was carefully minted with quicklime at the rate of 10 q / ha and treated with a disk harrow to a depth of 5 cm. Organic fertilizers were taken from the water level out of 31373

that 12 kg / ha. Flooding of the pond was carried out gradually 3 weeks before the airing. Daphnia Magna was introduced. The density of planting fry in feeding ponds when stocking was 10 thousand pieces / ha. For 63 days of cultivation at a water temperature of 18 ° C, the fish reached a mass of 84.5 g and a productivity of 8.2 c / ha.

The cost of fish feed recipe K-110-1 amounted to 1.02 g per 1 kg of growth. Feeding the fish was completed when the water temperature dropped to 6 C. Doses of applied feed in the autumn period at a temperature below 10 ° С composition10

15

It is 0.5% by weight of fish.

Before the ice in the pond brought bleach at the rate of 1 g / m. Water exchange was carried out only when the oxygen content dropped to 1.5-2.5 g / l. The concentration of oxygen was adjusted to 8 mg / l.

For the entire period of wintering, there were no cases of movement and death of fish. General fish productivity for 2

years of pulling, c / ha

Yield of commercial fish from young adults,%

Piece two-year, g

The cost of feed per 1 kg of fish growth, kg,

Yield yearlings from wintering:%

piece weight

Physiological and biochemical indicators of yearlings:

hematocrit

glycogen hemoglobin

total protein

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five

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After thawing ice and warming up the water column above 6 ° C, the fish in the pond began to be fed with the K-110-1 recipe at the rate of 0.5% of the fish weight. During the day, the asked feeds were completely eaten. With an increase in water temperature, the daily doses of the specified feeds were increased to 4% by weight. The daily ration was given two feeds per day. Fresh water was supplied only for loss replenishment, for ltration and evaporation during the deterioration of the oxygen regime.

Fertilization and liming were carried out as needed.

The yield of marketable fish from the young fish grown to the fry stage was 94%. Fish productivity was 33 C / G0. The time of growing fish to commodity in feeding ponds was 17 months.

33.0

94.0 352

1.9 100.0 84.5

44.0 9.2 8.2 3.2

Stage of stocking young when growing fingerlings

Planting density of youngsters, thousand pcs / ha

Water consumption per 1 kg of commercial fish, m

Table continuation

Larvae Malki

42.5

10.0

50-60

18-20

Claims (1)

METHOD FOR FISHING OF FISH, which involves growing young fish and then transplanting them into ponds and keeping them in the ponds to obtain marketable weight, characterized in that, in order to reduce fish losses and increase the yield of marketable products, young fish are raised to the fry stage, and fry are transplanted directly into the feeding ponds, while the initial planting density is 10-12 thousand units / ha. 1 12