JPH065739Y2 - Electric screen generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention forms an aquaculture area for algae, seaweeds, etc. on the seabed, and generates an electric screen for preventing invasion of seafood into the aquaculture area. Electric screen generator.

[Prior Art] Generally, when aquaculture is performed, there is a method of forming an electric screen instead of a conventional net as a method of preventing the invasion and escape of seafood in and out of a predetermined aquaculture area. By arranging a plurality of electrode rows in parallel in seawater, applying different potentials to each of the electrode rows by a power source, forming an electric screen with a predetermined electric field strength between the electrode rows, and by electrically stimulating the electric screen. , It blocks the swimming of seafood.

[Problems to be solved by the device]

The method of forming an electric screen with a plurality of electrode arrays described in the conventional technique is advantageous for a marine ranch with a fairly wide water area for large-scale aquaculture, but when algae and seaweeds are cultivated, There is a problem that the scale becomes too large and the power consumption becomes too large, which makes it unsuitable for aquaculture of algae and seaweeds.

Therefore, the present invention has been made with the above points in mind, and it is an object of the present invention to more reliably prevent invasion of fish and shellfish into the aquaculture area formed on the seabed.

[Means for Solving the Problems]

To achieve the above object, in the electric screen generator of the present invention, a plurality of long electrodes arranged at a predetermined interval in seawater, and between the long electrodes between adjacent long electrodes, and An even number of short electrodes arranged at equal intervals to each other and a power source for generating an electric screen for applying a voltage to each of the arranged electrodes so that the potentials of the adjacent electrodes are different from each other. It has a feature.

[Action]

With the above configuration, when a voltage is applied by the power source for generating an electric screen so that the potentials of the adjacent electrodes are different, electric fields between the short electrodes and between the short electrodes and the long electrodes are generated. The strength is high, the electric field strength between the long electrodes becomes weak, a strong electric field strength region is formed near the seabed, and a weak electric field strength region is formed above the strong electric field strength region.

Therefore, by arranging the electrodes so as to surround the aquaculture area such as algae and seaweed, even if seafood such as sea urchin and abalone that have a living sphere on the seabed are resistant to electrical stimulation and try to enter the culture area. , The invasion is blocked by the strong electric field strength region, even if a fish such as parrotfish and medina, which are relatively weak to algae-eating relatively electrical stimulation, try to enter the aquaculture region, the weak field strength region prevents the invasion, A moderate stimulus is given to fish and shellfish that are highly susceptible to physical stimulation and fish that is relatively weak to electrical stimulation, and the invasion of these fish and shellfish into the aquaculture area is reliably prevented.

〔Example〕

 Examples will be described with reference to the drawings.

Example 1 First, FIGS. 1 and 2 showing Example 1 will be described.

In FIG. 1, (1) is a rod-shaped or plate-shaped long electrode arranged in seawater at a predetermined interval L, and (2) is between the long electrodes adjacent to each other and with the long electrodes (1). An even number of short electrodes, two of which are arranged at equal intervals of L / 3, (3) is a power source for generating an electric screen, and is adjacent to each of the arranged electrodes (1) and (2). Voltages are applied so that the potentials of the electrodes are different.

By the way, assuming that the length of the long electrode (1) is, for example, 5D, which is almost equal to the water depth, and the length of the short electrode (2) is D, when the power supply voltage is V, as shown in FIG. Water depth 3D
The electric field strength in the area up to 4D is almost constant at E (= V / L), and the electric field strength in the area from 3D to 4D gradually increases from E to 3E as the water depth increases, and from 4D to the seabed. The electric field strength in a region up to a depth of 5D is almost constant at 3E, and a strong electric field strength region is formed near the sea floor, and a weak electric field strength region is formed above this strong electric field strength region.

Then, each electrode is placed so as to surround the aquaculture area such as algae and seaweed.
By arranging (1) and (2), even if seafood such as sea urchins and abalone, which have a living area on the seabed, that are resistant to electrical stimulation try to enter the aquaculture area, each short electrode is near the seabed.
Invasion is blocked by the strong electric field strength region between (2) and between the short electrode (2) and the long electrode (1), and fish such as parrotfish and medina that are relatively weak to algae-eating relatively electrical stimulation are cultured. Even if an attempt is made to invade the region, the invasion is blocked by the weak electric field intensity region between the long electrodes (1).

Therefore, according to Example 1, when algae, seaweed, etc. are cultivated, seafood such as sea urchin and abalone, which are highly resistant to electrical stimulation, and algae such as sea bream and medina, which are relatively weak to electrical stimulation, are used. , Each can give a suitable stimulus,
It is possible to reliably prevent the invasion of these seafood into the aquaculture area such as algae and seaweeds, and it is extremely effective for small-scale aquaculture such as algae and seaweeds without the increase in power consumption as in the past. is there.

Example 2 Next, FIG. 3 showing Example 2 will be described.

In the figure, (4) is a plurality of semi-arcuate long electrodes arranged at a predetermined interval on the seabed, and the sizes of the long electrodes (4) are sequentially different along the hemispherical surface. Each long electrode (4)
Are arranged in parallel with each other to form a hemispherical aquaculture area (5) such as seaweed.

Reference numeral (6) is a short electrode, and two long electrodes (4) are arranged between two adjacent long electrodes (4) at equal intervals.

A power source for generating an electric screen (not shown) applies a voltage to the arranged electrodes (4) and (6) so that the potentials of adjacent electrodes are different.

Then, by applying a voltage from the power source, a predetermined electric field strength region in the shape of a hemispherical shell is formed between the long electrodes (4), and between the short electrodes (6) near the seabed and the short electrodes.
A strong electric field strength region stronger than the predetermined electric field strength is formed between (6) and the long electrode (4).

Therefore, according to the second embodiment, the same effect as that of the first embodiment can be obtained.

In both the first and second embodiments, the short electrodes (2) and (6) are
Although the case where the number is set is described, the number is not limited to this, and may be an even number.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

It is possible to apply strong electrical stimulation to seafood such as sea urchins and abalone, which have a living area near the seabed, due to the strong electric field strength region between short electrodes and between long and short electrodes near the seabed. Since it is possible to give weak electrical stimulation due to the weak electric field intensity region between the long electrodes above the strong electric field intensity region to algae-eating fish such as parrotfish and medina that are relatively weak to electrical stimulation. It can give appropriate stimulation to fish and shellfish that are strong against electrical stimulation and fish that are relatively weak against electrical stimulation, and it does not increase power consumption as in the past, and can be used for small-scale algae, seaweed, etc. Extremely effective for aquaculture.

[Brief description of drawings]

The drawings show an embodiment of the electric screen generator of the present invention. FIGS. 1 and 2 are a front view of the embodiment 1 and a relational diagram of electric field strength and water depth for explaining the operation, and FIG. 3 is an embodiment. It is a perspective view of FIG. (1), (4) …… long electrodes, (2), (6) …… short electrodes, (3) ……
Power supply.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Carpenter 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Hiroyuki Suyama 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Inside Hitachi Shipbuilding Co., Ltd. (72) Inventor Seiji Otani 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Inside Hitachi Shipbuilding Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A plurality of long electrodes arranged in seawater at predetermined intervals, and an even number of long electrodes that are arranged at equal intervals between adjacent long electrodes. An electric screen generator comprising: a short electrode; and an electric screen generating power source for applying a voltage to each of the arranged electrodes so that the potentials of the adjacent electrodes are different.