Harvesting manufacturers (walleye fish)

preform manufacturers carried out in the autumn (September-October) on the bases of commercial fisheries located downstream.Select only the producers are not injured in the ratio of males and females of 1: 1, put them in the litter, divided into 4 sections.In order not to injure perches spiny fins in each section of the stretcher is placed on one individual.Stretcher with Sudak delivered to the slot in which they are planted up to 1000 pcs.Reserve procured producers (fish) should not exceed 30%.

Loaded slot manufacturers are delivered with the help of the ship-towing to the farm where pike cull and re-examine the injured during transport.Then the manufacturers put in the stretcher and transferred into the fallopian winter ponds, where they are kept until spring.The area of ​​one of the mother of the pond does not exceed 0.1 hectare.Its depth - 1.5-2 m. The ratio of width to length of the pond is 1: 3.The bed of the pond free of vegetation.In each such plant po
nd to withstand up to 1,000 producers (500 females and 500 males).

Seasoning producers (fish)

In winter uterine ponds producers stand to March.During the period of incubation are systematic observations of temperature and gas regime of water in ponds.Withstand manufacturers weakly running water (full exchange of water in ponds should occur within 10 days), wherein the content of oxygen dissolved in water of at least 5 mg / l.
the second half of October to March perch fed small low-value fish.The daily diet is an average of 1% of their mass.

spring manufacturers in the summer transplanted uterine ponds, the area of ​​each of which is 0.1 m (ratio of width to length of 1: 4), and the depth - 1,5 m. In this case, the female plant separately from males.Planting density of manufacturers is 15 birds per 10 m2.

spawning walleye

When the water temperature rises to 8 ° C, manufacturers put walleye spawn in special spawning ponds, the area of ​​each of them must not exceed 0.5 m (width at the bottom - about 10 m).The depth of these ponds - 1.5 m. Their bottom should be solid, free from silt and vegetation.Water is fed into the spawning ponds in volume, providing them a constant level, which can fall as a result of evaporation and filtration.

in spawning ponds should be installed in a staggered artificial spawning grounds (the nest).Each pocket is a wooden frame on which is placed made of aluminum wire circle with a diameter of about 1 m, intertwined threads kapron.On the basis of terms of net stacked bundles nylon yarns.The amount set out in the ponds of nests corresponds to the number of pairs of soot to spawn producers (one nest for female and male).In the spawning pond, an area of ​​0.5 hectares, is usually planted 500 pairs manufacturers (500 females and 500 males).
For the spawning pike in a short time (2-3 days), which gives the ability to grow in the future One-fry and eliminate mass cannibalism, each of them before boarding the spawning ponds make the pituitary injection.

Manufacturers injected into the spinal muscles.Depending on the temperature of water injected females 1.2-2.4 mg dry preparation gossip pituitary glands and male - half of these doses.Instead of pituitary injections can be used injection horioganina.In this case, the females are administered 150-250 units.horioganina and male - half of these doses.Working female fertility walleye is 200 thousand. Eggs.

After spawning manufacturers deposits on artificial nest eggs are transferred together with the substrate in the incubation room.

incubating eggs walleye

for incubation walleye use the freezer.This chamber is a room size 5X2,5X2,5 m in which eggs are incubated in a humid environment.To create the necessary humidity on either side walls at a height of 2 m laid water pipes in which every 0.5 m mounted water spray.Paul has a bias toward the center of the chamber, which is designed floodgate.In the middle of the camera mounted transverse strut 1.5 m and a height of 1.8 m, for which nests hang from fertilized eggs.Along the walls of the chamber by a passage width of 0.5 m. In just a few hours before hatching embryo nests with eggs at the stage of the embryo is removed from the rotating racks and transferred to a water-filled troughs, tubs or directly in the body of water, where it comes doinkubatsiya.In such a cell can be simultaneously incubate up to 20 million. Walleye eggs.Water flow in the small cell.Each nozzle passes about 20 liters of water per hour.Water exits the nozzles at a pressure of 0.5-2.5 atm.To supply the freezer right amount of water can be used standing water or sucking pump motor in 0.5-1 liters.s, or any other of the water supply installation.With this method of incubation is required a small amount of water that can be practically clean if necessary, heat up or cool down.Withdrawal of eggs for the incubation period is 5-10%.

In the absence of the freezer incubation walleye is carried out directly in the spawning pond.This waste of eggs for the incubation period is 20-30%.

Growing juveniles

walleye fry are grown in ponds, an area of ​​25-50 hectares.Depth nursery ponds - 1.5-1.8 m. His bed should be free of excess vegetation and silted.Nursery ponds fill with water up to the design level of up to 3 days before placing them in the doinkubatsiyu walleye eggs.In the 1 hectare nursery ponds placed 4-5 nests with eggs.Permanent water in the rearing ponds are not required.It is only necessary to prevent them falling water levels through evaporation and filtration, as well as to monitor the maintenance of a favorable gas regime.

Hatched prelarvae 3-4 days become larvae that move on a mixed diet, consuming smaller organisms of zooplankton.In order to ensure a sufficient amount of walleye larvae of invertebrates in ponds are making the same fertilizer and for the same standards as in the cultivation of a young walleye together with carp and bream.
In the absence of juvenile carp and bream differentiation in the size of the individual of the same age group of young walleye is very low, thus avoiding cannibalism.During 40 days of cultivation reaches walleye fry weight of 1.5 g, and its survival of calves is 15%.

Fish productivity ponds - 135-225 kg / ha, and therefore, the number of juveniles produced walleye is 90-150 thousand. Pieces.per hectare pond.

grown walleye fingerlings released from the ponds into the river or take out in the slots directly into the sea a river discharge space.With the release of this young water discharge from the nursery ponds should be independent of the level of high water in the river and should be carried out as soon as possible - within 5-10 days.

After the release of juveniles, which is completed by the middle of June, one part (25%) leave the nursery ponds dry for reclamation work in them.The bed of the ponds plowed, harrowed and used to fall under the crops.Another part of the pond (75%) once again fill with water and used to fall under the cultivation of young herbivorous fish, reducing the seasonality of fish work and significantly improves the profitability of farms.
Author: Editorial TutKnow.ru | View: open source