JPH0347496Y2 - - 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 method prevents fish and shellfish from escaping and entering the cage, but at the early stage of aquaculture, farmed fish are still young fish with a body length of several centimeters, and in order to prevent these small fish from swimming, In this case, it is necessary to use a very fine-mesh net to be placed in 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.

[Problem that the invention attempts to solve]

Therefore, areas where the water is not too deep, where the waves are calm, and where there are few tidal changes are usually selected as areas where fisheries are installed. However, even in areas that meet these conditions, nets may be washed away by typhoons or ships may be lost. The net may be damaged due to contact, and maintenance and upkeep of the net requires a great deal of effort and expense, and there is a problem in that the net cannot reliably block the swimming of fish and shellfish.

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 technical challenge of this invention is to be able to reliably block the swimming of fish and shellfish, regardless of ocean conditions such as tidal levels and tides, and weather conditions such as typhoons.

[Means for solving problems]

This invention was made with the above points in mind, and consists of three electrode rows in which a plurality of conductive electrodes are arranged in seawater at approximately equal intervals and arranged in parallel to each other; A connecting body electrically connects each of the conductive electrodes of each electrode row, and each of the electrode rows on one side and the center is at a low potential and the electrode row on the other side is at a high potential. This is an electric screen generator equipped with a power source for electric screen generation that applies voltage to an electrode array.

[Effect]

According to this invention, an electric screen is generated between each row of electrodes arranged parallel to each other in seawater so that the electrode rows on one side and the center have a low potential and the electrode rows on the other side have a high potential. A voltage is applied by a commercial power supply, and a double electric screen with two types of electric field strength is formed between each electrode row in the seawater, and fish and shellfish that enter the electric screen receive electrical stimulation, causing slight numbness or paralysis. This makes it impossible for fish and shellfish to swim through the electric screen, and the swimming of fish and shellfish is reliably blocked without the use of nets as in the past. It is unaffected by weather conditions and is extremely suitable for large-scale aquaculture such as on ocean farms.

〔Example〕

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

In FIG. 1, 1a, 1b, and 1c are formed by arranging a plurality of vertical conductive electrodes 2, each of which is longer than the water depth, at equal intervals, and are sequentially arranged parallel to each other at a predetermined distance apart. 1st, 2nd, 3rd
An electrode row, 3 is a connecting body that electrically connects each conductive electrode 2 of each electrode row 1a to 1c, 4a,
4b are first and second terminals connected to both ends of a DC power source (not shown) for generating an electric screen;
The first terminal 4a is grounded, the first and second electrode rows 1a and 1b are connected to the first terminal 4a, and the third electrode row 1c is connected to the second terminal 4b. so that the electrode rows 1a and 1b are at ground potential and the third electrode row 1c is at a predetermined potential.
A voltage is applied to each electrode row 1a to 1c via both terminals 4a and 4b.

At this time, the distribution of lines obtained by connecting equipotential points in any horizontal cross section perpendicular to each conductive electrode 2, that is, the distribution of equipotential lines, is as shown in FIG. The distance between the equipotential lines between 1b and 1c is narrower than the distance between the equipotential lines between the first and second electrode rows 1a and 1b, and the second and third electrode rows 1
This shows that the electric field strength between b and 1c is high.

For example, as shown in FIG.
The distance D1 between the second electrode rows 1a and 1b is 50 cm, and the distance D2 between the second and third electrode rows 1b and 1c is 50 cm.
If the voltage V ₀ between both terminals 4a and 4b is 5V, it is perpendicular to each electrode row 1a to 1c, and each electrode row 1a to 1
The relationship between the distance and potential between each electrode row 1a to 1c in a vertical cross section passing through the conductive electrode 2 of c is shown in FIG. 4, and the electric field strength E1 between the second and third electrode rows 1b and 1c is The electric field strength E2 between the first and second electrode rows 1a and 1b is approximately 0.025 [V/cm].
cm], and the high electric field strength E1 between the second and third electrode rows 1b and 1c and the first and second electrode rows 1a and 1b
A double electric screen is formed with two types of electric field strength, with a lower electric field strength E2 in between.

Therefore, fish and shellfish that have invaded such a double electric screen show a surprisingly mild reaction in the region where the electric field strength is low between the first and second electrode rows 1a and 1b, and In the area where the electric field strength is high between the rows 1b and 1c, electric shock such as mild numbness, paralysis, or even asphyxia will occur, and each electrode row 1a to 1c
are arranged so as to surround a predetermined aquaculture area with the first electrode array 1a inside, and when cultured fish and shellfish in the aquaculture area enter the electric screen, the first and second electrode arrays 1a, 1b The fish body is able to take sufficient repellent behavior without being damaged by the electrical stimulation, and the cultured fish and shellfish are confined within the culture area, and the cultured fish and shellfish are confined within the culture area. When a foreign enemy fish outside the area invades the electric screen, it receives strong electrical stimulation in the region of high electric field strength between the second and third electrode rows 1b and 1c, and exhibits a reaction such as paralysis, and the foreign enemy fish is destroyed in the aquaculture area. will be prevented from entering.

It goes without saying that the third and second electrode rows 1c and 1b may be used as ground electrodes instead of the first and second electrode rows 1a and 1b.

Further, as a power source for generating the electric screen, an AC power source or a pulse power source may be used.

[Effect of idea]

As described above, according to the electric screen generator of this invention, a double electric screen having two types of electric field strengths can be formed in seawater,
It is possible to electrically stimulate fish and shellfish that have entered the electric screen to prevent them from swimming through the screen, and unlike when using conventional nets, it is possible to prevent fish and shellfish that have entered the electric screen from changing over ocean conditions such as tide level, tide, water depth, and weather conditions such as typhoons. It is possible to reliably block the swimming of fish and shellfish without being influenced by the system, reducing the labor and cost required for net maintenance, and is extremely effective for large-scale aquaculture such as at marine farms. , and the effect is large.

Additionally, if each electrode row is arranged so that the area with low electric field strength is on the inside and an electric screen surrounds a predetermined aquaculture area, fish and shellfish can be confined within the aquaculture area without being damaged by electrical stimulation. can.

[Brief explanation of drawings]

The drawings show one embodiment of the electric screen generator of this invention, with FIG. 1 being a perspective view, FIG. 2 being a diagram showing the distribution of equipotential lines between each electrode row, and FIG. 3 being a diagram for explaining the operation. A schematic configuration diagram, FIG. 4 is a diagram showing the relationship between the distance between each electrode row and the potential in FIG. 3. 1a, 1b, 1c...electrode row, 2...conductive electrode, 3...connection body.

Claims (1)

[Scope of utility model registration request] Three electrode rows each formed of a plurality of conductive electrodes arranged at approximately equal intervals in seawater and arranged in parallel to each other, and each of the conductive electrodes for each electrode row were electrically connected to each other. A connecting body, and a power source for generating an electric screen that applies a voltage to each of the electrode rows so that the electrode rows on one side and the center have a low potential and the electrode rows on the other side have a high potential. Electric screen generator.