RU79752U1 - DEVICE FOR FISHING - Google Patents

Abstract

The utility model relates to the field of fish farming and can be used for the artificial cultivation of cold-loving fish in slow-flowing inland waters with sufficient depth.

The technical result from the application of the proposed device is to increase the efficiency of use of the resource of cold water and electric energy in order to optimize the temperature regime when growing cold-loving fish in cages in the summer.

This is achieved by the fact that in the device for growing fish, including a net cage in the shape of a cube, pontoons for installing the device on a pond, a submersible pump, while the net cage is placed in an external cage made of a flexible waterproof material, the upper part of which follows the shape of a cube , the lower one has the shape of an overturned truncated pyramid with a hole on the top, the device is also equipped with an overflow hole with a shield shutter located on the side wall of the external cage on the water edge.

In addition, the lower pyramidal part of the external cage is equipped with a metal tip with a hole at the top, plumb loads are fixed at the corners of the external cage at the junction of its upper and lower parts, and it is passed through the aeration unit to enrich the supplied water with dissolved oxygen.

Description

The device relates to the field of fish farming and can be used for the artificial cultivation of cold-loving fish in lakes and reservoirs with sufficient depth.

A device for growing fish in ponds is known, consisting of a cage line installed on a pond and a pumping unit that periodically creates a flow in cages at high water temperatures or when there is no wind (MPX RSFSR, GosNIORKH. Instructions for cage rearing of rainbow trout. L., 1974).

However, a decrease in water temperature due to horizontal artificial flow in the fish growing area is inefficient. The closest in technical essence and the achieved result is a system for growing and keeping whitefish and salmon fish, including a net cage line placed on rafts and installed in the deepwater part of the lake, and gasoline pumps, which, when the water temperature rises, pump cold water from the lower layers of the reservoir to the cages. (Growing whitefish and trout in cages. Fisheries. Ser. Fisheries use of inland waters. Express information VNIERH, issue 3, M., 1990)

The supply of cold deep water to the cages in the described manner is ineffective, since, having a high density, it plunges into the lower horizons, causing inflow along the periphery of the surface warm waters. At the same time, electricity and cold water in the reservoir are spent inefficiently.

The technical result from the application of the proposed device is to increase the efficiency of use of the resource of cold water and electric energy in order to optimize the temperature regime when growing cold-loving fish in cages in the summer.

This is achieved by the fact that in the device for growing fish, including a net cage having the shape of a cube, pontoons for installation

devices on a pond, a submersible pump, while the net cage is placed in an external cage made of flexible waterproof material, the upper part of which follows the shape of a cube, the lower one has the shape of an overturned truncated pyramid with an opening at the top, the device is also equipped with an overflow hole with a shield shutter located on the side wall of an external cage on a water edge.

In addition, the lower pyramidal part of the external cage is equipped with a metal tip with an aperture at the top, weights are fixed at the corners of the external cage at the junction of its upper and lower parts, and it is passed through the aeration unit to enrich the supplied water with oxygen.

The figure schematically shows a device for growing fish.

The device includes an external cage made of waterproof material (1) (for example, reinforced plastic film), the upper part of which is in the form of a cube or parallelepiped, and the lower shape of an overturned truncated pyramid with a hole at the top, a rectangular overflow hole (2) with a shield shutter grooves and contouring frames located on the side wall of the external cage on the edge of the water; a metal tip (3) of the pyramidal part of the outer cage with an opening at the top, plumb loads (4) fixed at the corners of the outer cage at the junction of its upper and lower parts; internal cage (5) from a mesh cloth for keeping fish; pontoons (6) for staging the device in a pond; submersible electric pump (7); water supply hose (8); water aeration unit (9).

The device operates as follows.

The device is mounted when there is a threat of heating the surface layers of water to temperatures unfavorable for the fish. The external cage is fixed on pontoons installed in a pond in a deep area with pronounced direct temperature stratification. Plumb weights, as well as the metal tip of the pyramidal part, ensure conservation

external cage forms in working position. Cultivated fish are deposited in the internal delta cage. The necessary temperature regime, fish breathing and normal sanitary state of the environment are ensured by supplying water with a submersible pump through a hose from a horizon having the required temperature. The immersion depth of the pump is adjustable. In case of deficiency of dissolved oxygen in the supplied water, it is passed through an aeration unit. Relatively heavy cold water does not mix with the surrounding warm water due to the walls of the external cage with a slight overpressure inside the device. The flow rate of the supplied water should exceed the flow rate of water at the outlet of the device through the lower hole of the metal tip of the pyramidal part of the external cage. Most of the cold water is held in the device, as it is heated, it is forced out to the surface with new portions of the incoming cold water and then removed from the edge through an overflow hole located at the wall opposite the water supply. The amount of overpressure in the device is regulated due to the cross section of the overflow hole using a shield shutter that moves along the grooves of the frame mounted on the wall of the external cage. The normal sanitary condition inside the device is ensured due to the fact that the remains of feed and feces settle on the inclined planes of the bottom of the external cage, slide along them to the hole of the metal tip of the pyramidal part and, carried away by the downward flow of water, are removed from the device. The maintenance of the internal cage is no different from the traditional cage fish farming.

In July-August 2005, the proposed device was successfully tested at the cage farm of the Volkovskoye State Fisheries Center (Tobolsk District, Tyumen Region). During the summer heating of the lake by supplying water from a depth of 6-8 m, it was possible to lower the temperature of the water in the device to 18-20 ° C, which is 3-6 ° C lower than the values outside it. This allowed continuous feeding of the yearlings deposited in the device.

trout, while in the control cage of a traditional design, due to high temperatures, the fish did not feed for two weeks. Under favorable temperature conditions, over the 20 days of the experiment, the average weight of juveniles from the device reached 190 g, and in the control cage with the natural temperature variation - 127 g. In the control cage, the individual trout mass decreased by 8 g by the end of the experiment. The differences in weight were 33%. As practice has shown, the cost and material consumption of the device are small. Due to the absence of a rigid frame and a collapsible design, the device is compact during transportation and storage, and is also easy to assemble.

Thus, the proposed device for growing fish allows you to optimize the temperature and oxygen conditions during the summer cultivation of cold-loving fish species in deep water bodies and, thus, expand the area of cage rearing of trout and whitefish.

Claims (4)

1. A device for growing fish, including a net cage having the shape of a cube, pontoons for installing the device on a pond, a submersible pump, characterized in that the net cage is placed in an external cage of flexible waterproof material, the upper part of which follows the shape of a cube, the lower has the shape an overturned truncated pyramid with a hole at the top, the device is also equipped with an overflow hole with a shield shutter located on the side wall of the external cage on the water edge. 2. The device according to claim 1, characterized in that the lower pyramidal part of the external cage is equipped with a metal tip with a hole on the top. 3. The device according to claim 1, characterized in that in the corners of the external cage on the articulation of its upper and lower parts are fixed weights. 4. The device according to claim 1, characterized in that it is equipped with an aeration unit.