SU925275A1 - Device for catching aqueous organisms in deep water - Google Patents

Description

the cable and bridle connected to the towing cable so that their joints are displaced relative to the net bag, the latter has an inlet neck made of rigid material, the cross section of which is made increasing in the direction of water flow and the depressor is fixed under the inlet through the end shay b.

In addition, the depressor is a hydrodynamic profile plate, the net bag has an open end, and its tail section is inserted into the bag and connected to the inlet throat by means of leads.

The drawing shows a device for catching aquatic organisms, a general view.

The device is a net bag 1 of conical shape, made of a mill gas or nylon sieve and having an annular cup 2 of soft filtering material for collecting objects and an end opening with ring 3 for mounting a standard plankton cup.

At the mouth of the net bag 1, an inlet neck 4 is made of a rigid material, the cross section of which is made increasing in the direction of the water flow. (The drawing shows a device having an inlet in the shape of a truncated pyramid). In the front part of the inlet neck 4, axles 5 are mounted for fastening the bridle 6, which serves to connect the device to the towing cable 7, while the joint 8 of the bridle 6 and the towing cable 7 is offset from the inlet neck 4.

Directly under the inlet throat 4 there is a depressor 9 in the form of a hydrodynamic profile plate with a negative lifting force, which is connected to the inlet throat 4 by means of end washers 10.

The tail section of the net bag 1 with the ring 3 is inserted inside the net bag and connected to the inlet neck 4 with the help of leads 11.

In addition, the device includes a bracket 12 for accommodating a flow meter and a depth sensor.

The capture of water organisms by the proposed device is carried out as follows.

Before launching, the ring 3 is fixed with the help of leads. And to the edges of the inlet neck 4. The launch of the device is carried out at low speed of the vessel, and when the required depth is reached, the speed of the vessel is increased to the desired level. At the window of pickling, the movement of the vessel is slowed down, the net bag 1 is quickly lifted and a standard plankton cup is attached to ring 3, the leashes 11 unfasten and wash the captured aquatic organisms from the ring cup 2 into plankton.

In the process of etching, due to the interaction of the water jets formed in the zone of action of the depressor 9, the inlet neck 4 and the filter material of the net bag 1, there is a significant increase in the filtering ability of the tracker.

The washers 10, preventing the flow of water from the side edges of the depressor 9, as well as the lower plane of the inlet neck 4, flow, direct the high-speed flow

5 to the net canvas. In the zone of connection of these high-speed flows, opening from the trailing edge of the depressor 9 and the plane of the inlet 4, a reduced pressure area is formed, and the interaction of the newly formed flow with the flow from the mesh of the netting bag 1 creates a field of vortices with increased instantaneous velocities, which enhances the filtering process. The achieved qualitative change in hydraulics in the mouth area of the device provides a sudden impact of the fishing gear on organisms, in particular, young fish, which leads to a significant increase in the catchability of the device.

So, if according to catches of the cone net, which is usually quantified in reservoirs, the concentration of juvenile carp fish from 15 to 40 mm in length in the reservoir was 63.1 ± 19.0 ind / 100 m of water, then according to catches of the proposed device, it It was 161.7 ± 18.4 ind / 100 m of water, i.e., the catchability of this device is 2.5 times higher. According to the data obtained when taking stock of juveniles in the reservoir, the coefficients of the fishing return are calculated, which are further guided in the creation of fish farms. The catch of juvenile fish also takes into account the damage caused to the fish economy by water intakes. In both cases, the catchability of fishing gear used for recording is low, which has a negative effect on the assessment of the country's fish stocks.

The use of the proposed device will make it possible to give reasonable recommendations to develop methods for protecting early} | 1 fish, the death of which in water intakes is large. For moloi and fishes of the early stages of development, only ecological methods of protection can be effective, based on knowledge of quantitative data on

0 distribution of juveniles in the water column. Ecological methods of protection can provide: saving 90% of all early juvenile fish. I

 Thus, the introduction of the proposed unit will contribute to the development of measures to reduce the damage from the death of young fish in the amount of up to 48 thousand rubles. for every 10 water intake capacity each year

A device for catching aquatic organisms in the water column, including a net bag, a depressor, a towing cable and a bridle connected to the towing cable so that their connection node is displaced relative to the mouth of the net bag, characterized in that with an increase in filtering capacity of the net bag and an increase catchability, in the mouth of the net bag is installed inlet | The bottom of the neck of a rigid material, the cross section of which is made increasing in the direction of the movement of water flow, and the depressor is fixed under the inlet neck redstvom of face washers.

2. The device according to claim 1, characterized in that the depressant is

hydrodynamic profile plate.

3. The device according to claim 1, characterized in that the net bag has an open end, and its tail section is inserted

inside the bag and connected to the inlet throat by means of leads.

Sources of information taken into account in the examination; 1. Kiselev I. А. Plankton of seas and continental reservoirs. Volume I, L., “Science, 1969, p. 181.

2. In the same place 198.

3. In the same place 204 (prototype).

Claims (3)

Claim A device for catching aquatic organisms in the water column, including a net bag, a depressor, a tow rope and a bridle connected to the tow rope so that the connection node is offset from the mouth of the net bag, characterized in that, with a slit to increase the filtering ability of the net bag and increase catch, at the mouth of the net bag there is an inlet neck made of hard material, the cross section of which is made increasing in the direction of the flow of water, and the depressor is strengthened under the inlet neck in the middle stvom of face washers. 2. The device according to π. 1, characterized by the fact that the depressor is a hydrodynamic profile plate. 3. The device according to π. 1, characterized in that the net bag has an open end and its tail section is inserted 10 inside the bag and connected to the inlet by means of leashes.