SU1746965A1 - Device for incubation of fish spawns - Google Patents

Abstract

Use: incubation of fish eggs with their artificial reproduction. SUMMARY OF THE INVENTION: To increase the water flow through the container for placing the caviar, to ensure precise control of the flow, and thereby increasing the survival of the caviar, the container for the caviar is made in the form of a cylindrical vessel with a conical bottom and is installed vertically in a water vessel. The device comprises a water tank, a tank for receiving water, the lower part of which is connected to the apex of the cone forming the bottom of the tank for caviar with a flexible hose, and the airlift with a lifting nozzle for supplying water from the tank to the tank for receiving water. The internal diameter of the flexible hose must not exceed the size of the internal diameter of the airlift lifting pipe. The container for placing the caviar is mounted for movement vertically relative to the container for receiving water. In the upper edge of the calf container, a cutout can be made to drain the water, covered by a shutter, and under the latter a removable collection of dead caviar is placed. 1 hp f-ly, 5 ill. Yo

Description

FIELD: fish farming. namely, devices for incubating fish eggs.

A device for incubating fish eggs, which is a container with partitions and airlifts, is used to mix water. The flow of water generated in this device is insufficient for the successful incubation of the bottom caviar, which settles to the bottom and is in the zone of the weakest mixing of water.

The closest to the claimed is a device for incubating fish eggs, including a tank for water, tanks for placing eggs, a tank for receiving water with a filter and an airlift with a lifting nozzle for supplying water from the tank to

water tank. In connection with this. that the water in a wide layer is distributed in containers for placing eggs — made in the form of a cuvette — in this device it is not possible to achieve a high flow of water. In this connection, the donna eggs from a number of marine fish species are covered with fouling and die in significant numbers.

The purpose of the invention is to increase the flow of water through the tank to accommodate the caviar, to ensure accurate regulation of the flow and thereby increase the survival of the caviar.

For this purpose, in the device for incubating the eggs, including the water tank, the tank for placing the eggs, the tank for receiving water with a filter, and the airlift with a lift, V

about. oh oh ate

A water connection from the tank to the tank for receiving water, the tank for placing the calf is made in the form of a cylindrical vessel with a conical bottom and is installed vertically in the tank for water. The lower part of the water receiving tank communicates with the top of the cone forming the bottom of the tank for placing the calf, by means of a flexible pipe, the internal diameter of which does not exceed the internal diameter of the lifting pipe of lift. In this case, the container for placing the caviar is mounted for movement vertically relative to the container for receiving water.

In addition, it is advisable to cut the semicircular shape in the upper edge of the container for placing the caviar to drain the water, which is blocked by a valve, and provide the device with a removable collection of dead caviar, placing it under the cutout.

Making the container for placing the caviar in the form of a relatively narrow hollow cylinder with a conical bottom allows a significant increase in flow through the developing caviar. 8 due to the fact that the bottom is made conical, the eggs constantly move to the bottom of the tank to accommodate the eggs, where they are picked up by a stream of water. As a result, depending on the amount of flow, the roe is either constantly stirred by the flow of water, or all the time in a suspended state. Since in the tank for receiving water its level depends on the airlift performance and is constant, the displacement of the tank to accommodate The calf (which communicates with the tank for receiving water through the flexible nozzle) in the vertical direction allows the amount of water flow through the developing eggs to be controlled with high precision. To ensure this movement, the connecting pipe is flexible. Adjusting the flow of water by changing the air flow through the airlift is very limited, since the performance of the airlift depends mainly on the diameter of the lifting nozzle and the height of the part of the nozzle in which the water is enclosed. Adjusting the amount of flow through the installation of a faucet on a flexible nozzle does not allow it to change accurately enough, because with a decrease in the cross section of the flexible nozzle, the water level in the water intake tank rises and the flow rate increases again over time.

Experiments have shown that the internal diameter of the flexible nozzle should not exceed that of the airlift lifting nozzle. Otherwise, in the lower part of the conical bottom of the container for placing the eggs, there is not enough flow through the eggs, the eggs are not suspended, it settles to the bottom and is covered with fouling.

0 To remove dead caviar, it is necessary that the notch at the upper edge of the container for placing the caviar has a semicircular shape. At the same time, in the central part of this cut, the largest flow of water is created,

5 and dead caviar, having a relatively low specific weight, enters the collection for dead caviar. If this notch is rectangular, dead eggs can be retained at its edge in the bone to accommodate the eggs, since

water flow becomes more uniform.

FIG. 1 shows a device for

caviar incubation; in fig. 2 - another option

the relative position of the elements of the system; in fig. 3 — capacity for caviar placement mounted on a support; in fig. 4 - a flap overlapping a semicircular cut in the upper edge of the container for placing the caviar; in fig. 5 - collection for dead caviar.

The device for incubating fish eggs consists of a tank 1 for water, a tank 2 for placing eggs, made in the form of a hollow cylinder with a conical bottom and installed vertically in tank 1 for water, a tank 3 for receiving water, an airlift with a lifting pipe 4, a pipe 5 for supplying air and a spray 6, a flexible nozzle 7 connecting by

0 fitting 8, the lower part of the tank 3 for receiving water with a container 2 for accommodating the caviar. To connect to the flexible port

7in the lower middle part of the conical bottom of the container 2 for placing the calf

5 nipple 9. In order to achieve high flow through the developing caviar, the internal diameter of the flexible nozzle 7 should not exceed that of the airlift nozzle 4.

0 A container 3 for receiving water can be placed in a tank 1 for views (Fig. 1).

In this case, it is attached to the wall of the water tank 1 by means of the hook 10 and closed with a removable cover 11, in

5, the opening of which is fixed to the air inlet 5. The water receiving container 3 is connected to the water tank 1 by means of an airlift lifting pipe 4, the lower part of which is outside the water receiving container 3. In tank 3 for

receiving water between its walls and the lifting pipe 4 is made of horizontal perforated partitions 12, between which is enclosed filter material 13.

The container 3 for receiving water can be placed next to the water tank 1 (Fig. 2). In this tank, vertical partitions 14 are perforated in the upper or lower part, between which filter material 13 is enclosed. One of the partitions 15 is lower than the partitions 14, does not have perforations and serves to maintain a certain level of water in the tank 3 to receive water. In the section formed by the partition 15 and the wall of the container 3 for receiving water, there is no filter material. In its lower part there is a fitting 8 connected to the flexible pipe 7. One end of the lifting pipe 4 of the airlift is connected to the bottom of the water tank 1, and the other opens to the first section of the water receiving tank 3 formed by the wall of this tank and the partition 14.

The container 2 for accommodating the caviar is adapted to move in the vertical direction relative to the container 3 for receiving water. For this, it is mounted on the support 16, which is fixed to the wall of the water tank 1 by means of bolts 17 and 18. The support 16 in the lower part is loosely fastened with two nuts 19, and in the upper part it is fixed to the bolt 17 by means of a nut with ears 20. Bolts 17 and 18 are missed respectively in the upper vertical slot 21 and the lower vertical slot 22 of the support 16 (Fig. E). In the upper part of the support there is a handle 23.

A semicircular cut-out 24 with a removable flap 25 is made in the upper edge of the container 2 for placing the caviar. The slot 26 is provided for tightly closing the flap 25 of the semi-circular cut 24 (Fig. 4).

To the left and to the right of the semicircular cut-out 24 on the wall of the container 2 for placing the caviar, two vertical guides 27 are made in the cross section of a trapezoidal shape with bearing pads 28 in the lower part (Fig. 5).

The caviar collection 29 is made removable and has a thickened end wall 30, a bent wall-shaped container 2 for accommodating the caviar, with a semicircular notch 31 having the same size as the semicircular notch 24. In the wall 30 there are two vertical trapezoidal cross-sections grooves that fit guides 26

trapezoidal shape. The opposite end wall 32 of the collection 29 for dead caviar has a mesh surface and can be made of small pieces or 5 gas.

The device works as follows.

In the water tank 1, the tank 2 for placing caviar (with the damper 25 closed) 10 and the tank 3 for receiving water fill the water and turn on the airlift, supplying compressed air through the pipe 5. At the same time, due to the operation of the airlift, the water level in the tank 3 for receiving water becomes higher than in tank 15. Slightly loosen the nut with ears 20 and, moving the support 16 in the vertical direction using the handle 21, achieve the position of the container 2 for placing the caviar so that the water level in it is below the water level in the tank 3 for receiving water, and the caviar placed in the tank 2, was in the conditions required at this stage of development of the flow of water. 5 After that, the nut with the ears 20 is screwed to the full, the support 16 at the required height.

The water injected by the airlift from the water tank 1 is supplied to the water receiving tank 3, where the passage through the perforated partitions 12 (Fig. 1) or the vertical partitions 14 and 15 (Fig. 2) and the filter material 13 is filtered and according to the law of communicating vessels, 5 goes through fitting 8 to flexible nozzle 7. and from there, via fitting 9 to container 2 to accommodate caviar. The water splashes out the eggs and, having reached the upper edge of the container 2, pours out again into the tank 1. The movement of water 0 is indicated by arrows in FIG. 1 and 2. Adjusting the flow rate by changing the height of the arrangement of the container 2 for placing the eggs relative to the container 3 for receiving water makes it possible to achieve the required movement of the eggs. In particular, the caviar can either be in a suspended state or settle to the bottom with only a portion of the eggs moving under the action of water.

0If it is necessary to take out the dead caviar, the shutter 25 is taken out and the collector 29 for the dead caviar is inserted using the guides 27 and the corresponding grooves in its end wall 30 until contact- ing. 5 neither the bottom of the collector 29 with the supporting pads 28. At the same time, the main flow of water begins to flow through the semicircular notch 24 in the upper edge of the tank 2 to place the eggs into the semicircular notch 31 in the end wall 30, inside the collector 29 for the dead caviar. Being entrained by a strong flow of water, the dead calf, which has a lower specific weight as compared to the live one, falls into the collection 29. To more completely separate the dead eggs from the living ones, the size of the water flow can be adjusted by changing the height of the support 16 with a capacity of 2 to accommodate the caviar.

In the caviar collector 29, the dead calf appears, and the water supplied from the caviar accommodation container 2 passes through the end wall 32 and enters the water storage tank 1. After the completion of the selection of the dead calf, the collection 29 for the dead calf is taken out together with the dead calf, and the shutter 25 is closed. The duration of the spawn collection is a few minutes,

During operation of the device, it is possible to create a strong flowing water, sufficient to incubate both the bottom and pelagic eggs of the fish in suspension. With such incubation on the roe, fouling does not develop and its survival rate increases significantly. In particular, the survival rate of the roe of the catfish before hatching in the device, made according to the prototype, is 2%, and in the claimed device - 80%.

The ability to move the tank for placing the eggs in the vertical direction allows you to precisely adjust the amount of water flow required at this stage of development of the eggs. In addition, it is possible to quickly separate and remove the dead calf, which

improves survival of the remaining live caviar.

The device can be used both for industrial purposes and in field and laboratory conditions.

Claims (2)

1. Device for incubating fish eggs, including a water tank, a tank for placing eggs, a tank for receiving water with a filter and airlift with a lifting nozzle for supplying water from the tank to the tank for receiving water, characterized in that, in order to increase the flow of water through the tank to accommodate the caviar, to ensure precise flow control and thereby increase the survival of the eggs, the capacity for placing the caviar is made in the form of a cylindrical vessel with a conical bottom and installed vertically in a water tank, the lower part of the water receiving tank communicates with the top of the cone forming the bottom of the tank for caviar placement by means of a flexible nozzle, the value the inner diameter of which does not exceed the size of the inner diameter of the airlift lifting pipe, the capacity for caviar accommodation is mounted with the ability to move vertically relative to the capacity for receiving water. 2. Device pop. 1, characterized in that in the upper edge of the container for placing the caviar a semicircular cut is made for draining the water, overlapped by a flap, and the device is equipped with a removable collection of dead caviar placed under said cut. - / I f) ISi U Q 9969Ш 22 Phage 3 2f ipt / .4 FIG. five