Predatory fish

In carp ponds during filling with water often gets low (weed) fish (verhovka, ruff, gudgeon, roach, etc.), which to a great Kolichestvennye natural food.

In addition, in ponds inhabited by frogs, their larvae, various beetles, causing fish farming safely damage. To combat them in breeding ponds additional predatory fish – pike perch, catfish, pike.

Pike passes to predatory way of life at the age of 1 month. Its diet consists of weed fishes, the body height does not exceed 10% of its length.

Raising perch is usually carried out over 2 years before reaching the mass of 300-500 g. In southern areas with good food provision young of the year perch can reach 300 g. To produce offspring perch using healthy and netravmirovannymi producers at the age of 3-4 years (sex ratio 1:1) caught from natural waters, although producers selected from dvuhletki grown in ponds, fish tanks give the best results. Repair a herd and young stock kept in ponds uterine depth 2-2,5 m with a well-planned bed.

Walleye spawning takes place at temperatures of 7.5-8 degrees in cages, made of nylon or stainless metal mesh and installed at quiet sites with pebbly, sandy or dense clay base. Strew the bottom of the cages disinfected spruce and juniper branches. The lower part of the charge placed on the depth of 0.5 m from the bottom of the pond.

For prestemon to use ponds with an area of 200-400 m2, depth up to 2 m, with a firm bottom on which to establish 2-3 spawning “armchair” with a frame, bound spruce branches. The flow in the pond is kept to a minimum and only in the incubation period.

When the perch the length of 2-3 cm at the age of 2-3 weeks the fry are caught by using the bonitation fish traps. The walleye fingerlings are grown in a separate nursery ponds with dense Nazarenes bottom or jointly with segoletki and dvuhletkami carp. The density of young perch in the cultivation of carp with segoletki does not exceed 10, and when grown with dvuhletkami – 15 thousand PCs./ha. of Fingerlings weighing 12-15 g place to winter in the ponds depth of 2 m at stocking density up to 200 thousand PCs./ha. over-Wintered yearlings in early spring sits in the fishing ponds.

Usually nests for spawning of perch is made from washed roots of willow, sedge, spruce or branches of a skeleton with scraps amorozova Delhi. After spawning in Zimbali, pond, natural pond or cage the nest is transferred to a feeding pond on the basis of one nest on 3 hectares of pond.

Pike in the ponds intensively destroys the perch, a ruff, verhovku, alley, Rudd, dragonfly larvae, frogs, tadpoles and therefore is widely used as an additional fish. It gives a lift to godovikam carp fry on stage at the age of 18-20 days. DL apresta used by producers in ponds or caught in rivers and lakes. When the content producers pike in ponds during the wintering period of their feed rate of 200-300 g fish on the 1 kg mass pike a month.

Spawning is carried out in a group or cluster method in the carp spawning ponds with nazarenism bottom, covered with vegetation, with a constant level and flow clear and pure water. After transition to active feeding at the age of 12-15 days the larvae transplanted into feeding ponds.

Young of the year pike in ponds reach on peat land mass of 150 g, in the Central stripe – 400 grams, in Ukraine – about 650 g, implement them in the fall. by Northern pike on the productivity of carp increased by 60-120 kg/ha.

Along with the carp can be grown catfish. He compared with the perch and pike is better suited to ponds, as it has a high vitality and has a very wide range of food. In carp ponds destroys trash fish, frogs, beetles, leeches, and even eat the dead aquatic animals.

Catfish are caught from rivers. Throughout the year contain in ponds separated by sex and fed the fish in the amount of 30% of its mass.

Spawning is carried out in wintering ponds on spawning nests from roots of willow, installed at 3-4 m from the shore near the water supply when the water level of 0.15-0.30 m. the ratio at spawning is 1:1. After prestinenza transferred into the pond, cages or tanks shaded from the sun. 80-82 hours after hatching occurs the larvae, characterized by photophobia and needed shelter out of grass or willow roots. On active feeding, the larvae pass into the age of 7-10 days, after which they are transplanted in fry ponds with an area of 0.05-0.07 ha from developed vegetation at stocking density of 300 thousand PCs./ha and podesheveyut within 25 to 30 days to achieve weight 2-5 g

From Malkovich ponds catfish transplanted into nursery ponds and podesheveyut together with segoletki carp at stocking density of 3-5 thousand PCs./ha. in Autumn, yearlings, reaching a weight of 25-30 g at the exit of 70%, placed in wintering ponds along with the carp or separately. With co-location of planting norm is 80-100 thousand pieces/ha, and the yield of 90-95%

Standards of planting the fry of predatory fishes, pieces/ha

The number of weed fish, kg/ha

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