RU56118U1 - DEVICE FOR GROWING YOUNG FISH IN FLOWING WATER - Google Patents

Abstract

The device relates to fish farming and is intended for growing juveniles in natural or artificial watercourse using artificial feed. The goal is to provide favorable abiotic conditions for the development and growth of juvenile fish. To do this, in a device for growing juvenile fish in running water, including a rectangular fish tank with a rigid frame, the side walls of which are made of waterproof material, the end walls are mesh, and means for placing the device in a reservoir in a floating state, while the end walls of the tank made in the form of a set of removable frames covered with a mesh with different mesh sizes, increasing from the inner to the outer frames, which are inserted into the grooves located on the side walls and the bottom of the tank, and with are fitted with stoppers to prevent accidental lifting of the frames, and the bottom is made of mesh, the mesh size of which is equal to the mesh size of the internal frames.

Description

The device relates to fish farming and is intended for growing juveniles in natural or artificial watercourse using artificial feed.

A device is known for growing fish larvae, made in the form of a tank mounted on three supports, into which water is supplied. On the outside of the upper part of the tank, a gutter is welded for the assembly of iridescent water. There is a hole in the gutter to which a hose is attached with a pipe to drain water into the sewer. Tanks for feeding feed are fixed above the tank on the brackets.

Growing of larvae in such a pool is carried out only up to 2-3 weeks of age, and then they are transferred to cages (I. Mukhachev, “Biotechnology for the accelerated cultivation of commodity peled.” Tyumen: Federal State Institution “Tyumen”, 2003 - 176 s).

This device has a relatively complex design and can be used in hatcheries in specially equipped workshops.

The closest in technical essence is a device (taken as a prototype) for fish farming in the form of a rectangular cage with a rigid frame. The side walls of the device are made of waterproof material, and the front and rear walls are tightened with a metal mesh. The size of the mesh cells depends on the size of the reared juveniles (Ivleva IB A new type of plankton catcher for fish farming. Exchange of advanced technical experience. VNIRO - M: 1959).

The disadvantages of this device is the short duration of the juvenile content in it, since as it grows, it is necessary to transplant into a device with end grids of a larger mesh. In addition, the design of this device does not allow you to adjust the flow rate inside the tank. This device is designed to contain young fish due to the penetration of food organisms from the environment. Is not

allows to achieve high intensity of the production process. It is not suitable for growing fish using artificial feed in it, because uneaten food and fecal matter will accumulate on the waterproof bottom, which worsens the growing conditions.

The technical result from the use of the proposed device is to provide favorable abiotic conditions for the development and growth of juvenile fish.

This is achieved by the fact that in the device for growing juvenile fish in running water, including a rectangular fish tank with a rigid frame, the side walls of which are made of waterproof material, the end walls are mesh, and means for placing the device in a reservoir in a floating state, the end walls of the tank are made in the form of a set of removable frames covered with a mesh with different mesh sizes, increasing from the inner to the outer frames, which are inserted into the grooves located on the side walls and not the container and are provided with stoppers for preventing accidental lifting framework, and the bottom is made of mesh, the cell size which is the size of the internal frames of cells.

Fig. 1 schematically shows a device for growing juvenile fish in running water (fragment);

Fig. 2 - also, end view;

fig. 3 - also, side view;

Fig. 4 - also, a top view.

The device is a rectangular-shaped tray with a wooden frame made of timber (1). The side walls (2) of the device are sheathed with metal sheets. The bottom of the tray (3) is covered with a brass mesh with 2 mm cells.

From the end sides, the grid is attached to the transverse blocks (4), which, along with the struts (5), give rigidity to the entire structure. The side walls of the tray with end faces are provided with internal grooves (6) for

a set of frames covered with a metal mesh with different cell sizes. At the bottom of the frame with meshes, grooves (7) of the transverse block are included. The grooves are equipped with stoppers (not shown in the figure) to prevent accidental lifting of the frames.

The device operates as follows.

The device is installed in low current with the help of two pontoons (two sections of pontoons connected in series along each side). By adjusting the distance from the coast, turning the device at a certain angle to the flow, and also lowering frames with different cell sizes into the external grooves, you can adjust the speed and structure of the flow inside the tray. Usually it is 0.5-0.8 lengths of fish per second (for whitefish larvae - 0.01-0.03 m / s). As juveniles grow, the inner frames with smaller cells are removed, which improves water exchange and facilitates the removal of feed and feces from the tray.

In the front part of the device (downstream), a feeder is installed on the water surface over the entire width of the tray, which is a wooden box without a bottom 20 cm wide. The feeder prevents premature flow of feed from the tray. Particles of artificial feed, gradually getting wet, fall from the bottom of the feeder and are carried by the stream in the water column along the entire length of the tray, which allows creating optimal conditions for food intake by young people consuming food in the water column (whitefish). The device is cleaned daily: the bottom and walls of the tray are brushed, the feeder is removed from the water, wiped and dried.

As the work carried out with the Baikal omul and whitefish showed, the use of the described installation for growing juveniles on artificial feed has a number of advantages compared to the traditional technological scheme in sigovodstvo (pool - gas cage - split cage). There is no need to build and operate a basin base as a result of simplification of the technological scheme. Up to the stage of underyearling, rearing can be carried out without intermediate fish transplants; due to higher water exchange, the intensity increases by a factor of 2–3

fish-breeding process, and the specific labor costs for feeding and harvesting are reduced, in addition, partly the diet of juveniles is provided by live feed brought in by the stream.

The device was successfully used to grow juvenile Baikal omul and whitefish on the river. Ine (Barguzinsky hatchery) for six years. In 2005, two devices of the described construction are operated at the cage farm of the State Fishery Center on the river. Mustache in the Tobolsk district of the Tyumen region for growing juvenile peled.

Claims (2)

1. A device for growing juvenile fish in running water, including a rectangular container with a rigid frame, the side walls of which are made of waterproof material, the end walls are mesh, and also means for placing the device in a reservoir in a floating state, characterized in that the end walls containers are made in the form of a set of removable frames covered with a mesh with different mesh sizes, increasing from internal to external frames, and the bottom is made of mesh, the mesh size of which is equal to the size of internal cells amok. 2. The device according to claim 1, characterized in that the frames are inserted into grooves located on the side walls and the bottom of the tank, and are equipped with stoppers to prevent accidental lifting of the frames.