JPH0347495Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electric screen generating device that generates an electric screen for blocking the swimming of fish and shellfish in seawater when cultivating fish and shellfish.

[Conventional technology]

Generally, when cultivating fish and shellfish, a cage is set up in seawater, and the fish and shellfish are cultured within the cage.Usually, a net is stretched around the seawater to form a cage, and the net is used to extend the fish and shellfish to the outside of the cage. This prevents fish and shellfish from escaping and entering the inside of the cage, but at the early stage of aquaculture, farmed fish are still young fish with a body length of several centimeters, and this prevents the swimming of these young fish. In this case, it is necessary to use a very fine mesh net to be placed in the seawater.

However, in sea areas where tidal changes can be as large as several meters, the nets are easily damaged, and even if the damage is slight, young fish can easily escape, resulting in the inconvenience of requiring a great deal of effort and expense to maintain and maintain the nets. occurs,
In order to eliminate these inconveniences, conventionally, the sea areas where the fish cages are installed are selected in areas where the water depth is not too deep, the waves are calm, and there are few tidal changes, but even in areas that meet these conditions, typhoons The nets may be washed away due to water pollution, etc., or damaged due to contact with ships, which requires a great deal of effort and expense to maintain and maintain the nets, and the nets cannot reliably block the swimming of fish and shellfish. There is a problem.

In addition, when carrying out large-scale aquaculture such as at marine farms, the total length of the nets used is extremely long, and the labor and expense required to maintain and maintain the nets are correspondingly large. Using nets for isolation is not the best strategy for large-scale aquaculture.

Therefore, the present applicant has proposed the following electric screen generator.

That is, a plurality of vertical rod-shaped conductive electrodes are arranged in seawater at approximately equal intervals to form a first electrode row, and each conductive electrode is electrically connected by a connecting body. second and third electrode rows are formed by arranging vertical rod-shaped conductive electrodes at approximately equal intervals in the same pitch as the first electrode row; Each of the conductive electrodes is electrically connected by a connecting body, and the electrode rows are arranged parallel to each other, and the distance between the first and second electrode rows is set to the distance between the second and third electrode rows. For example, the second electrode row in the center is used as a ground electrode, and a DC voltage is applied between each electrode row using a power source for generating an electric screen, and a double voltage with different electric field strength is applied between each electrode row. It generates an electric screen.

Fish and shellfish that have entered such an electric screen are electrically stimulated, and when fish and shellfish enter between the first and second electrode rows, where the electric field strength is low, they show a surprised state, and the electric field strength is low. big 2nd, 3rd
If fish and shellfish invade between the electrode rows, they will experience an electric shock reaction such as slight numbness, paralysis, or even asphyxia, and will be unable to swim through the electric screen, and will be unable to swim through the electric screen and move the first electrode row inside. If each electrode row is arranged to surround a specific culture area with an electric screen, the cultured fish and shellfish in the culture area will be surprised by the electrical stimulation in the inner part of the electric screen where the electric field strength is low and will take repellent behavior. , the enemy fish outside the aquaculture area are paralyzed by electrical stimulation at the outer part of the electric screen where the electric field strength is high, and the aquaculture fish are confined within the aquaculture area without being damaged by the electrical stimulation, and the enemy fish are This means that intrusion into the aquaculture area will be prevented, and the swimming of fish and shellfish will be reliably blocked without using nets as in the past. This makes it suitable for large-scale aquaculture such as ocean farms.

[Problem that the invention attempts to solve]

However, in this case, compared to the distance between the first and second electrode rows and between the second and third electrode rows,
The spacing between the conductive electrodes in each electrode row cannot be made very large, and workers have to use ships to move in and out of the aquaculture area in order to observe the aquaculture status and maintain and inspect the electrode rows. In this case, each of the electrode rows at the same potential must be crossed,
Since the distance between the conductive electrodes of each electrode row is narrow, there is a problem in that a ship cannot pass between the conductive electrodes.

That is, as shown in FIG. 4, for example, a voltage V is applied by a power source 4 between two electrode rows 2 and 3 formed by arranging a plurality of rod-shaped conductive electrodes 1 at an arrangement interval L in seawater. Considering the case where the distance between both electrode rows 2 and 3 is a constant value D,
The relationship between the value of D/L and the electric field intensity efficiency when the value of V/D is 100% is shown in Figure 5. The smaller D/L, that is, the larger the array spacing L, the higher the electric field The strength efficiency decreases, and the swimming blocking efficiency for fish and shellfish decreases. Therefore, if the distance D is constant as described above, the array spacing L cannot be made too large, and the passage between each conductive electrode of the ship is reduced. This will lead to difficulties and inconveniences.

Therefore, the technical challenge of this invention is to reliably block the swimming of fish and shellfish without using conventional nets, and also to allow ships to pass over the sea above the electric screen.

[Means for solving problems]

This invention was made with the above points in mind, and includes a plurality of electrode rows each formed by arranging three or more conductive electrodes in seawater and arranged in parallel to each other, and each of the electrodes. comprising a connecting body electrically connecting each of the conductive electrodes of each column, and a power source for generating an electric screen that applies a voltage to each of the electrode columns so that the potential of each of the electrode columns is sequentially different, and In the electric screen generating device, the arrangement interval of each of the conductive electrodes in each of the electrode rows is the same in each of the electrode rows, and the arrangement interval is set to two or more types.

[Effect]

Therefore, according to this invention, each electrode row is formed by arranging the conductive electrodes in each electrode row so that the spacing between the conductive electrodes is the same in each electrode row, and there are two or more types of spacing between the conductive electrodes. A voltage is applied to each electrode row by a power source to form an electric screen between each electrode row.

At this time, the electric screen between each electrode row has a multiple structure having two or more different electric field intensities, and the electric screen between each electrode row of the multiple structure is effectively connected in the width direction of each screen to form a long length. This long electric screen reliably blocks the swimming of fish and shellfish without damaging them due to electrical stimulation.

Furthermore, as described above, since the electric screen becomes long by effectively connecting a plurality of electric screens, the direction of the electrode rows of the same potential and the direction of the final electric screen will intersect, It becomes possible to increase the distance between the conductive electrodes in the longitudinal direction of the electric screen without reducing the blocking efficiency, and a ship can pass across the electric screen on the sea above the electric screen.

〔Example〕

Next, this invention will be explained in detail with reference to FIGS. 1 to 3 showing one embodiment thereof.

In Figures 1 and 2, 5a, 5b, 5
C, 5d, and 5e are first to fifth electrode rows formed by arranging five vertical rod-shaped conductive electrodes 6 in seawater and arranged in parallel to each other at a constant distance D; The arrangement interval of each conductive electrode 6 in each electrode row 5a to 5e is L1, and the arrangement interval of the first, second, and third conductive electrodes 6 is L1, and the arrangement interval of the third, fourth, and fifth conductive electrodes 6 is L1. Each of the electrode rows 5a to 5e is formed such that the spacing between the conductive electrodes 6 is L2 (<L1).

7 is a connection body electrically connecting each conductive electrode 6 of each electrode row 5a to 5e, 8 is a power source for generating an electric screen, and one end is a ground electrode for the first, third, and fifth electrodes. Columns 5a, 5c, 5e
The other end is connected to the second and fourth electrode rows 5b and 5d.
A voltage is applied to each electrode row 5a-5e so that the potential of each electrode row 5a-5e is sequentially different, and an electric screen is formed between each electrode row 5a-5e.

At this time, since the arrangement spacing of the conductive electrodes 6 in each electrode row 5a to 5e is set to two types, L1 and L2 (<L1), the area of the former arrangement spacing L1, that is, the area in FIG. The potential distribution in the area from the first to third conductive electrodes 6 of each electrode row 5a to 5e, which are shaded diagonally upward to the left, is as shown in FIG. 3a, and the latter arrangement spacing L2 , that is, the third to fifth electrode rows 5a to 5e, which are shaded diagonally upward to the right in FIG.
The potential distribution in the region up to the conductive electrode 6 is as shown in FIG. 3b.

However, FIGS. 3a and 3b respectively show potential distributions in a vertical cross section passing through the second conductive electrode 6 and a vertical cross section passing through the fourth conductive electrode 6 of each electrode row 5a to 5e, respectively, and the horizontal axis is the first
This is the distance in the direction of the fifth electrode row 5e with respect to the electrode row 5a, and the vertical axis represents the potential of the second and fourth electrode rows 5b and 5d due to the applied voltage V of the power source 8, respectively.

In FIGS. 3a and 3b, each electrode row 5a
The potential gradient around the conductive electrodes 6 in ~5e is very steep, indicating that the electric field strength is very large, and the potential gradient between the conductive electrodes 6 in adjacent electrode rows is gentler than that around the conductive electrodes 6. This shows that the electric field strength is decreasing.

Furthermore, when comparing Figures 3a and 3b, the potential gradient between the conductive electrodes 6 of adjacent electrode rows is steeper in Figure 3b, and the interval between the conductive electrodes 6 is smaller in Figure 2. It can be seen that the electric field strength in the diagonally upward-rightward shaded portion of FIG. 2 is greater than the electric field strength in the diagonally upward-leftward shaded portion in FIG.

Therefore, the electric screens between each electrode row 5a to 5e have a double structure having two types of electric field strength, and these double structure electric screens are connected in the width direction of each screen. Substantially, a long electric screen is formed in the width direction, and when a fish enters the electric screen as shown by the arrow in FIG. If the invading fish further intrudes in the direction of the arrow, it will receive strong electrical stimulation in the area where the electric field strength is large. By arranging each electrode array so as to surround a specific culture area with the side with the lower electric field strength facing inward, using an electric screen between each electrode array, the cultured fish within the culture area will be protected from damage caused by electrical stimulation. At the same time, enemy fish outside the cultivation area receive strong electrical stimulation in a region with a high electric field strength outside the electric screen, and invasion of enemy fish into the cultivation area is prevented. Ru.

At this time, as described in the explanation of FIG. 5, each distance D between each electrode row 5a to 5e in FIGS. If the ratios D/L1 and D/L2 with L2 are large, that is, if the distance D is sufficiently large compared to the distances L1 and L2, the efficiency of blocking swimming of fish and shellfish will not decrease due to a decrease in electric field strength efficiency. , it becomes possible to increase each distance D between each electrode row 5a to 5e, and it becomes possible for a ship S to pass between each electrode row 5a to 5e as shown in FIG. It is possible to easily move in and out of the aquaculture area by crossing the aquaculture area, and it becomes possible to easily grasp the aquaculture status of cultured fish and shellfish and to easily perform maintenance and inspection of each electrode array.

It goes without saying that each electrode row may be formed by three or four conductive electrodes 6, and the electric screen may have a structure having two or more different electric field strengths.

[Effect of idea]

As described above, according to the electric screen generator of this invention, the spacing between the conductive electrodes in each electrode row is made the same in each electrode row, and the arrangement spacing is set to 2.
The electric screen can have a structure with two or more different electric field intensities, and can reliably block the swimming of fish and shellfish without using a net like in the past. It is possible to prevent damage to the fish body due to physical stimulation, and it also allows ships to pass over the sea above the electric screen, making it easy to observe the cultivation status of cultured fish and shellfish and to perform maintenance and inspection of each electrode row. The effect is extremely large.

[Brief explanation of drawings]

1 to 3 show one embodiment of the electric screen generator of this invention, and FIG. 1 is a perspective view;
Figure 2 is a schematic configuration diagram, Figures 3a and b are potential distribution diagrams at different positions, Figure 4 is a schematic diagram of a conventional example, and Figure 5 shows the distance between electrode rows and the arrangement spacing of conductive electrodes. FIG. 3 is a diagram showing the relationship between electric field strength efficiency and the ratio of . 5a to 5e...electrode row, 6...conductive electrode, 7...
...Connection body, 8...Power supply.

Claims (1)

[Scope of utility model registration request] A plurality of electrode rows each formed by arranging three or more conductive electrodes in seawater and arranged in parallel to each other, and a connecting body that electrically connects each of the conductive electrodes of each electrode row. , a power source for generating an electric screen that applies a voltage to each of the electrode rows so that the potential of each of the electrode rows is sequentially different; and an arrangement interval of the conductive electrodes for each electrode row is set to An electric screen generator in which the rows are the same and the arrangement spacing is set to two or more types.