JPH0471493B2 - - Google Patents
Info
- Publication number
- JPH0471493B2 JPH0471493B2 JP61012676A JP1267686A JPH0471493B2 JP H0471493 B2 JPH0471493 B2 JP H0471493B2 JP 61012676 A JP61012676 A JP 61012676A JP 1267686 A JP1267686 A JP 1267686A JP H0471493 B2 JPH0471493 B2 JP H0471493B2
- Authority
- JP
- Japan
- Prior art keywords
- fish
- shellfish
- swimming
- less
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 241000251468 Actinopterygii Species 0.000 claims description 33
- 235000015170 shellfish Nutrition 0.000 claims description 31
- 230000009182 swimming Effects 0.000 claims description 18
- 239000013535 sea water Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 7
- 238000009360 aquaculture Methods 0.000 description 6
- 244000144974 aquaculture Species 0.000 description 6
- 230000000638 stimulation Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 206010033799 Paralysis Diseases 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001124325 Marsupenaeus japonicus Species 0.000 description 1
- 241000269908 Platichthys flesus Species 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 231100000862 numbness Toxicity 0.000 description 1
Landscapes
- Farming Of Fish And Shellfish (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、魚貝類を養殖する場合に、海水中
における魚貝類の遊泳を遮断する魚貝類の遊泳遮
断方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for blocking the swimming of fish and shellfish in seawater when cultivating fish and shellfish.
一般に、魚貝類を養殖する場合、海水中にいけ
すを設け、該いけす内において魚貝類の養殖を行
なつており、通常海水中に網を張りめぐらしてい
けすを形成し、網によりいけすの外側への魚貝類
の脱出やいけすの内側への魚貝類の侵入を阻止し
ているが、養殖初期の段階では、養殖魚はまだ体
長数cmの稚魚であり、これら稚魚の遊泳を遮断す
るためには、海水中に配設すべき網として非常に
目の細かいものを用いる必要がある。
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 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 in order to prevent the swimming of these young fish, it is necessary to prevent them from swimming. , it is necessary to use a very fine mesh net to be placed in seawater.
ところが、潮汐変化が数mもあるような海域で
は、網が破損し易く、わずかな破損でも稚魚の場
合には容易に脱出できるため、網の保守、維持に
多大な労力と費用を要するという不都合が生じ
る。 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.
そこで、通常いけすを設ける海域として、水深
が深過ぎず、波が穏やかで潮汐変化の少ないとこ
ろが選定されるが、このような条件を満たす海域
であつても、台風等による網の流失や船舶の接触
による網の破損が発生することがあり、やはり網
の保守、維持に多大な労力、費用を要し、網によ
り確実に魚貝類の遊泳を遮断することができない
という問題点がある。
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.
また、海洋牧場のように大規模な養殖を行なう
場合には、使用する網の全長が非常に長いものに
なり、魚貝類の遊泳遮断に網を用いることは、大
規模養殖の場合最良の方策とは言えない。 In addition, when carrying out large-scale aquaculture such as at marine farms, the total length of the nets used is extremely long, and using nets to block the swimming of fish and shellfish is the best strategy for large-scale aquaculture. It can not be said.
したがつて、この発明は、潮位、潮汐などの海
洋条件や台風などの気象条件に左右されることな
く、確実に魚貝類の遊泳を遮断できるようにする
ことを技術的課題とする。 Therefore, the technical problem of this invention is to ensure that swimming of fish and shellfish can be blocked without being affected by ocean conditions such as tide levels and tides, or weather conditions such as typhoons.
この発明は、前記の点に留意してなされたもの
であり、海水中における魚貝類の遊泳を遮断する
魚貝類の遊泳遮断方法において、電位傾斜が0.05
〔V/cm〕未満、0.05〔V/cm〕以上から0.1〔V/
cm〕未満、0.1〔V/cm〕以上から0.2〔V/cm〕以
下の順になる領域を海水中に形成することを特徴
とする魚貝類の遊泳遮断方法である。
This invention has been made with the above-mentioned points in mind, and provides a method for blocking the swimming of fish and shellfish in seawater, in which the potential gradient is 0.05.
Less than [V/cm], 0.05 [V/cm] or more to 0.1 [V/cm]
This is a method for blocking swimming of fish and shellfish, which is characterized by forming a region in seawater in the order of V/cm, 0.1 [V/cm] or more and 0.2 [V/cm] or less.
そして、この発明では、電位傾斜が0.05〔V/
cm〕未満、0.05〔V/cm〕以上から0.1〔V/cm〕
未満、0.1〔V/cm〕以上から0.2〔V/cm〕以下の
順になる領域が海水中に形成され、当該領域に侵
入する魚貝類は、電位傾斜が小さい場合には軽い
電気的刺激に驚いた状態を示し、電位傾斜が大き
い場合には軽い痺れ、さらには麻痺などの反応を
示し、当該領域を遊泳通過することができなくな
り、従来のように網を用いることなく魚貝類の遊
泳が確実に遮断され、潮位、潮汐などの海洋条件
や台風などの気象条件に左右されることもなく、
海洋牧場などの大規模な養殖に適している。
In this invention, the potential slope is 0.05 [V/
cm], from 0.05 [V/cm] to 0.1 [V/cm]
A region is formed in seawater in the order of 0.1 [V/cm] or more to 0.2 [V/cm] or less, and fish and shellfish that invade this region are startled by light electrical stimulation if the potential gradient is small. If the potential gradient is large, a reaction such as mild numbness or even paralysis will occur, making it impossible for fish and shellfish to swim through the area, making it possible for fish and shellfish to swim without using nets as in the past. It is not affected by ocean conditions such as tide levels or tides, or weather conditions such as typhoons.
Suitable for large-scale aquaculture such as ocean farms.
つぎに、この発明を、その実施例を示した図面
とともに詳細に説明する。
Next, the present invention will be described in detail with reference to drawings showing embodiments thereof.
まず、この発明の原理について説明すると、た
とえば海水中に2個の電極を平行に設け、両電極
間に直流電源による直流電圧を印加したときに、
両電極間を遊泳する魚貝類がどのような反応を示
すか調べたところ、第2図に示すようになつた。
ただしこの測定は、“まだい”、“ひらめ”、“くる
まえび”を対象として行なつた。 First, to explain the principle of this invention, for example, when two electrodes are placed in parallel in seawater and a DC voltage from a DC power source is applied between the two electrodes,
When we investigated the reactions of fish and shellfish swimming between the two electrodes, we found the results shown in Figure 2.
However, this measurement was conducted on "Madai", "Flounder", and "Kuruma Shrimp".
すなわち、第2図に示すように、両電極間の電
位傾斜がほとんど0の場合には、対象魚は何の反
応も示さず、電位傾斜が0.05〔V/cm〕程度にな
ると、軽い電気的刺激に驚いた状態となり、電位
傾斜が0.05〔V/cm〕を越えて0.1〔V/cm〕前後
になると、軽い痺れ反応を示し、電位傾斜が0.1
〔V/cm〕を越えて0.2〔V/cm〕程度になると、
麻痺状態となり、電位傾斜が0.2〔V/cm〕を越え
てさらに大きくなると、硬直状態さらには致死状
態となる。 In other words, as shown in Figure 2, when the potential gradient between the two electrodes is almost 0, the target fish shows no reaction, and when the potential gradient becomes about 0.05 [V/cm], it shows a slight electric shock. When the person becomes startled by the stimulus and the potential gradient exceeds 0.05 [V/cm] and becomes around 0.1 [V/cm], a mild numbing reaction occurs, and the potential gradient becomes 0.1 [V/cm].
When it exceeds [V/cm] and reaches about 0.2 [V/cm],
The patient becomes paralyzed, and if the potential gradient increases beyond 0.2 [V/cm], the patient becomes rigid and even fatal.
そこで、第1図に示すように、海水中に第1〜
第4の電極1〜4を平行に配設し、各電極1〜4
の間隔l1,l2,l3をそれぞれl1=200cm,l2=150cm,
l3=100cmに設定し、たとえば第1の電極1をア
ース電極として、第2の電極2の電位V1、第3
の電極3の電位V2、第4の電極4の電位V3が、
それぞれV1=8〔V〕,V2=21〔V〕,V3=38〔V〕
となるように、第1〜第3電源5〜7により各電
極1〜4に直流電圧を加え、第1、第2の電極
1,2間の電位傾斜E1が0.05〔V/cm〕未満の約
0.03〔V/cm〕になり、第2、第3の電極2,3
間の電位傾斜E2が0.05〔V/cm〕以上から0.1
〔V/cm〕未満の約0.08〔V/cm〕になり、第3、
第4の電極3,4間の電位傾斜E3が0.1〔V/cm〕
以上から0.2〔V/cm〕以下の約0.16〔V/cm〕に
なるような領域を海水中に形成する。 Therefore, as shown in Figure 1, the first to
The fourth electrodes 1 to 4 are arranged in parallel, and each electrode 1 to 4 is arranged in parallel.
The intervals l 1 , l 2 , l 3 are respectively l 1 = 200 cm, l 2 = 150 cm,
l 3 = 100 cm, for example, with the first electrode 1 as the ground electrode, the potential V 1 of the second electrode 2, the third
The potential V 2 of the electrode 3 and the potential V 3 of the fourth electrode 4 are
V 1 = 8 [V], V 2 = 21 [V], V 3 = 38 [V], respectively.
A DC voltage is applied to each electrode 1 to 4 by the first to third power supplies 5 to 7 so that the potential gradient E 1 between the first and second electrodes 1 and 2 is less than 0.05 [V/cm]. about
0.03 [V/cm], and the second and third electrodes 2 and 3
The potential gradient E 2 between is 0.05 [V/cm] or more to 0.1
It is about 0.08 [V/cm] less than [V/cm], and the third
The potential gradient E 3 between the fourth electrodes 3 and 4 is 0.1 [V/cm]
From the above, a region with a voltage of about 0.16 [V/cm], which is less than 0.2 [V/cm], is formed in seawater.
このとき、各電極1〜4はそれぞれ、直径300
mmの銅からなる複数個の電極棒が20cm間隔で配設
され、電気的に順次接続されて構成されているも
のとする。 At this time, each electrode 1 to 4 has a diameter of 300 mm.
It is assumed that a plurality of electrode rods made of copper with a diameter of 2 mm are arranged at intervals of 20 cm and are electrically connected in sequence.
そして、たとえば第1の電極1を内側にし、所
定の範囲を囲むようにして各電極1〜4を海水中
に配設することにより、第1の電極1の内側を遊
泳する魚貝類、あるいは第4の電極4の外側を遊
泳する魚貝類が、各電極1〜4により形成される
前記した電位傾斜の順になる領域に侵入すると、
当該領域に侵入した魚貝類は電気的な刺激を受け
るため、当該領域を遊泳通過することができず、
当該領域で囲まれた範囲内に魚貝類が閉じ込めら
れることになる。 For example, by placing the first electrode 1 on the inside and placing each of the electrodes 1 to 4 in seawater so as to surround a predetermined range, fish and shellfish swimming inside the first electrode 1 or a fourth When fish and shellfish swimming outside the electrode 4 enter the region formed by the electrodes 1 to 4 in the order of the potential gradient described above,
Fish and shellfish that have entered the area are electrically stimulated and are therefore unable to swim through the area.
Fish and shellfish will be confined within the range surrounded by the area.
とくに、前記領域の内側は電位傾斜が小さく、
外側は電位傾斜が大きいため、前記領域で囲まれ
た範囲内で養殖している魚貝類は強い電気的刺激
を受けにくく、外来魚貝類は強い電気的刺激を受
け易くなり、養殖している魚貝類が電気的刺激に
より損傷を受けることを防止でき、養殖魚貝類を
効果的に保護できる。 In particular, the potential gradient inside the region is small;
Because the potential gradient is large on the outside, fish and shellfish cultivated within the area surrounded by the above region are less likely to receive strong electrical stimulation, and foreign fish and shellfish are more susceptible to strong electrical stimulation, which makes it difficult for farmed fish and shellfish to receive strong electrical stimulation. Shellfish can be prevented from being damaged by electrical stimulation, and cultured fish and shellfish can be effectively protected.
したがつて、従来の網による場合のように、潮
汐変化や台風等による網の破損もなく、網の保守
等に要していた労力、費用を軽減することがで
き、水深、潮位、潮汐などの海洋条件や台風など
の気象条件に左右されることなく、確実に魚貝類
の遊泳を遮断でき、潮汐変化の多少あるような海
域においても適用することが可能となり、海洋牧
場などの大規模養殖に適している。 Therefore, unlike with conventional nets, there is no damage to the nets due to tidal changes or typhoons, and the labor and cost required for net maintenance can be reduced. It is possible to reliably block the swimming of fish and shellfish without being affected by ocean conditions or weather conditions such as typhoons, and it can be applied even in sea areas where there are some tidal changes, making it suitable for large-scale aquaculture such as marine farms. suitable for
なお、第3図に示すように、海水中に6個の電
極8a〜8fを平行に配設し、各電極8a〜8f
間それぞれの電位傾斜Ea,Eb,Ec,Ed,Eeが
順次に0.05〔V/cm〕未満、0.05〔V/cm〕以上か
ら0.1〔V/cm〕未満、0.1〔V/cm〕以上から0.2
〔V/cm〕以下、0.05〔V/cm〕以上から0.1〔V/
cm〕未満、0.05〔V/cm〕未満となるように、各
電極8a〜8fに電位をかけるようにしてもよ
い。 In addition, as shown in FIG. 3, six electrodes 8a to 8f are arranged in parallel in seawater, and each electrode 8a to 8f
The potential gradients Ea, Eb, Ec, Ed, and Ee are sequentially less than 0.05 [V/cm], from 0.05 [V/cm] or more to less than 0.1 [V/cm], and from 0.1 [V/cm] or more to 0.2.
[V/cm] or less, from 0.05 [V/cm] or more to 0.1 [V/
cm] and less than 0.05 [V/cm], the potential may be applied to each electrode 8a to 8f.
以上のように、この発明の魚貝類の遊泳遮断方
法によると、電位傾斜が0.05〔V/cm〕未満、
0.05〔V/cm〕以上から0.1〔V/cm〕未満、0.1
〔V/cm〕以上から0.2〔V/cm〕以下の組み合わ
せからなる領域を海水中に形成したため、当該領
域に侵入した魚貝類に電気的刺激を与えて遊泳通
過を阻止することができ、従来の網を用いる場合
のように、潮位、潮汐、水深などの海洋条件や台
風などの気象条件に左右されることなく、確実に
魚貝類の遊泳を遮断することが可能となり、網の
保守に要していた労力、費用を軽減することがで
き、海洋牧場などの大規模な養殖に非常に有効で
あり、その効果は極めて大きい。
As described above, according to the method for blocking the swimming of fish and shellfish of the present invention, the potential gradient is less than 0.05 [V/cm],
0.05 [V/cm] or more to less than 0.1 [V/cm], 0.1
By forming a region in seawater consisting of a combination of V/cm or more and 0.2 V/cm or less, it is possible to electrically stimulate fish and shellfish that have invaded the region and prevent them from swimming through the area. This makes it possible to reliably block the swimming of fish and shellfish without being affected by ocean conditions such as tide level, tide, water depth, etc. or weather conditions such as typhoons, as is the case when using nets. It is possible to reduce the labor and costs that were previously required, making it extremely effective for large-scale aquaculture such as on ocean farms, and its effects are extremely large.
図面は、この発明の魚貝類の遊泳遮断方法の実
施例を示し、第1図および第2図は1実施例を示
し、第1図は概略構成図、第2図は原理説明図、
第3図は他の実施例の概略構成図である。
1〜4,8a〜8f……電極、5〜7……電
源。
The drawings show an embodiment of the method for blocking swimming of fish and shellfish of the present invention, and FIGS. 1 and 2 show one embodiment, FIG. 1 is a schematic diagram, and FIG. 2 is a diagram explaining the principle.
FIG. 3 is a schematic configuration diagram of another embodiment. 1-4, 8a-8f... electrode, 5-7... power supply.
Claims (1)
類の遊泳遮断方法において、電位傾斜が0.05
〔V/cm〕未満、0.05〔V/cm〕以上から0.1〔V/
cm〕未満、0.1〔V/cm〕以上から0.2〔V/cm〕以
下の順になる領域を海水中に形成することを特徴
とする魚貝類の遊泳遮断方法。[Claims] 1. A method for blocking the swimming of fish and shellfish in seawater, wherein the potential gradient is 0.05.
Less than [V/cm], 0.05 [V/cm] or more to 0.1 [V/cm]
A method for blocking the swimming of fish and shellfish, characterized by forming an area in seawater with a voltage of less than 0.1 [V/cm] and 0.1 [V/cm] and less than 0.2 [V/cm].
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61012676A JPS62171630A (en) | 1986-01-23 | 1986-01-23 | Method for blocking swimming of fishes and shellfishes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61012676A JPS62171630A (en) | 1986-01-23 | 1986-01-23 | Method for blocking swimming of fishes and shellfishes |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62171630A JPS62171630A (en) | 1987-07-28 |
JPH0471493B2 true JPH0471493B2 (en) | 1992-11-13 |
Family
ID=11811977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61012676A Granted JPS62171630A (en) | 1986-01-23 | 1986-01-23 | Method for blocking swimming of fishes and shellfishes |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62171630A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0665266B2 (en) * | 1988-03-10 | 1994-08-24 | 日立造船株式会社 | Fish swimming blocker |
-
1986
- 1986-01-23 JP JP61012676A patent/JPS62171630A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS62171630A (en) | 1987-07-28 |
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