JPH0440973B2 - - Google Patents
Info
- Publication number
- JPH0440973B2 JPH0440973B2 JP61012675A JP1267586A JPH0440973B2 JP H0440973 B2 JPH0440973 B2 JP H0440973B2 JP 61012675 A JP61012675 A JP 61012675A JP 1267586 A JP1267586 A JP 1267586A JP H0440973 B2 JPH0440973 B2 JP H0440973B2
- Authority
- JP
- Japan
- Prior art keywords
- fish
- shellfish
- swimming
- area
- seawater
- 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
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- 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、これらの稚魚の遊泳を遮断
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 in the early stage of aquaculture, farmed fish are still young fish with a body length of several centimeters, and in order to block the swimming of these young fish, In this case, 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 several meters, 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が少ないとこ
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 the 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 are problems 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、網の保守，維持に要する労力，費用もそれ
だけ多大になり、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 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.
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 the present 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、海水中に電位傾
斜と通電時間との積が0.0〔Ｖ・sec／cm〕以上に
なるような領域を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 includes a method for blocking the swimming of fish and shellfish in seawater, in which the product of potential gradient and energization time in seawater is 0.0 [V]. This is a method for blocking the swimming of fish and shellfish, which is characterized by forming an area with an area of 1000 sec/cm or more.
そして、この発明では、海水中に電位傾斜Ｅ
〔Ｖ／cm〕と通電時間ｔ〔sec〕との積Ｅ・ｔが
0.01〔Ｖ・sec／cm〕以上になるような領域が形成
され、当該領域に侵入する魚貝類は軽い痺れや麻
痺などの感電反応を示し、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 gradient E in seawater is
The product E・t of [V/cm] and energization time t [sec] is
A region with a voltage of 0.01 [V sec/cm] or more is formed, and fish and shellfish that invade this region exhibit electric shock reactions such as mild numbness and paralysis, and are unable to swim through the region, making it impossible to The swimming of fish and shellfish is reliably blocked without using nets, and the tide level,
It is not affected by ocean conditions such as tides or weather conditions such as typhoons, making it suitable for large-scale aquaculture such as on marine 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、１実施例を示した第１図および第２図に
ついて説明する。 First, FIG. 1 and FIG. 2 showing one embodiment will be explained.
いま、第２図の原理説明図に示すように、海水
を満たした容器１内の両端部に平行に２枚の電極
２ａ，２ｂを配設し、両電極２ａ，２ｂそれぞれ
に設けられた接続端子３ａ，３ｂを介し、図示さ
れていない電源により両電極２ａ，２ｂにたとえ
ば直流電圧を印加し、両電極２ａ，２ｂ間の電位
傾斜Ｅ〔Ｖ／cm〕と通電時間ｔ〔sec〕との積Ｅ・
ｔが0.1〔Ｖ・sec／cm〕以上になるようにし、容
器１内の対象物４に電気的刺激を加える。 Now, as shown in the principle explanatory diagram in Fig. 2, two electrodes 2a and 2b are arranged in parallel at both ends of a container 1 filled with seawater, and connections provided on both electrodes 2a and 2b, respectively. For example, a DC voltage is applied to both electrodes 2a, 2b by a power source (not shown) via terminals 3a, 3b, and the potential gradient E [V/cm] between both electrodes 2a, 2b and the current conduction time t [sec] are calculated. Product E・
Electrical stimulation is applied to the object 4 in the container 1 so that t is 0.1 [V·sec/cm] or more.
このとき、対象物４として“まだい”，“くるま
えび”，“ひらめ”，“あさり”，“やどかり”を収容
し、前記の積Ｅ・ｔがどれくらいの値になつたと
きに前記した各対象物４が反応を示すかを調べた
ところ、第１図に示す通電時間ｔと電位傾斜Ｅと
の関係図中の１点鎖線の右側，すなわち同図中の
斜線を施こした範囲で感電反応を示し、電位傾斜
Ｅが大きく，通電時間ｔが長いほど、硬直あるい
は致死などの強い感電反応を示し、軽い痺れなど
の最も軽微な感電反応を示し始めるのが、同図中
の１点鎖線の境界線であり、この境界線は同図中
の破線で示す電位傾斜Ｅと通電時間ｔとの積Ｅ・
ｔが0.1〔Ｖ・sec／cm〕の曲線にほぼ近似するこ
とができる。 At this time, the objects 4 are ``Madai'', ``Kuruma Shrimp'', ``Flounder'', ``Clam'', and ``Hermit Crab''. When we investigated whether the object 4 exhibited a reaction, we found that there was an electric shock on the right side of the dashed-dotted line in the relationship diagram between current application time t and potential slope E shown in Figure 1, that is, in the diagonally shaded area in the figure. The larger the potential gradient E and the longer the current application time t, the stronger the electric shock reaction such as stiffness or death, and the one that starts to show the slightest electric shock reaction such as mild numbness is shown by the dashed-dotted line in the figure. This boundary line is the product E・
It can be approximately approximated to a curve where t is 0.1 [V·sec/cm].
したがつて、電位傾斜Ｅと通電時間ｔとの積
Ｅ・ｔが0.1〔Ｖ・sec／cm〕以上となるような領
域を海水中に形成することにより、当該領域に侵
入する魚貝類は感電反応を示し、当該領域を遊泳
通過することができなくなり、従来の網に代わ
り、特定の範囲を囲むように前記した領域を海水
中に形成することにより、前記領域で囲まれた範
囲内からの魚貝類の脱出および前記領域で囲まれ
た範囲内への魚貝類の侵入が阻止され、前記領域
で囲まれた範囲内に魚貝類が閉じ込められること
になり、従来の網による場合のように潮汐変化や
台風等により網の破損することもなく、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, by forming an area in seawater where the product E・t of the potential gradient E and the current application time t is 0.1 [V・sec/cm] or more, fish and shellfish that invade the area will be electrocuted. By forming the above-mentioned area in the seawater to surround a specific area, instead of using the conventional net, it is possible to detect the fish from within the area surrounded by the area. The escape of fish and shellfish and the intrusion of fish and shellfish into the area enclosed by the said area are prevented, and the fish and shellfish are trapped within the area enclosed by said area, and the tidal The net will not be damaged due to change 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 causing any turbulence, 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.
つぎに、他の実施例を示した第３図について説
明する。 Next, FIG. 3 showing another embodiment will be explained.
いま、第３図に示すように、海水中に電位傾斜
Ｅと通電時間t1との積Ｅ・t1が0.1〔Ｖ・sec／cm〕
となる領域を形成するのは前記実施例と同じであ
るが、前記実施例と異なる点は、t1〔sec〕の通電
の後に電位傾斜が０となるt2〔sec〕の通電休止期
間を設けた点である。 Now, as shown in Figure 3, the product E・t 1 of the potential gradient E and the energization time t 1 is 0.1 [V・sec/cm] in seawater.
It is the same as in the previous embodiment that a region where This is the point I made.
このとき、通電休止期間t2はあまり長いと魚貝
類の遊泳を遮断できないため、魚貝類の遊泳速
度，通電により形成される前記領域の幅，長さお
よび魚貝類の感電後のの回復時間などにもとづい
て通電休止期間t2を定める必要があり、t2はほぼ
0.5〜３〔sec〕程度に設定すればよい。 At this time, if the energization suspension period t 2 is too long, swimming of fish and shellfish cannot be interrupted, so the swimming speed of fish and shellfish, the width and length of the area formed by energization, and the recovery time of fish and shellfish after electric shock, etc. It is necessary to determine the power-off period t 2 based on the following, and t 2 is approximately
It may be set to about 0.5 to 3 [sec].
そして、たとえば通電による前記領域の幅およ
び長さをそれぞれ2m，18mとし、通電時の電位
傾斜Ｅを0.08V／cm，通電時間t1を2sec，通電休
止期間を2secに設定して実際の海水中で実験的に
どれだけの数の魚貝類が通電休止期間中の前記領
域を遊泳通過するか測定したところ、“まだい”，
“ひらめ”，“くるまえび”，“すずき”，“やどかり
”
などそれぞれ５〜10匹に対し、前記領域を遊泳通
過する魚貝類の数は０であつた。 Then, for example, the width and length of the area by energization are set to 2 m and 18 m, respectively, the potential gradient E during energization is set to 0.08 V/cm, the energizing time t1 is set to 2 sec, and the energizing rest period is set to 2 sec. When we experimentally measured the number of fish and shellfish swimming through the area during the period when the electricity was not applied, we found that it was still not enough.
“Flounder”, “Kuruma shrimp”, “Suzuki”, “Hermit crab”
The number of fish and shellfish swimming through the area was 0, compared to 5 to 10 fish and molluscs, respectively.
ところで、このように通電を断続することによ
り、連続的な通電により前記した領域を形成する
場合に比べ、消費電力を1/5〜１／２に低減する
ことが可能となる。 By the way, by intermittent energization in this manner, it is possible to reduce power consumption to 1/5 to 1/2 compared to the case where the above-mentioned regions are formed by continuous energization.
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、海水中に電位傾斜と通電時間との積
が0.1〔Ｖ・sec／cm〕以上になるような領域を形
成するため、当該領域に侵入した魚貝類に電気的
刺激を加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, in order to form a region in seawater where the product of the potential gradient and the current application time is 0.1 [V sec/cm] or more, the region is It is possible to apply electrical stimulation to fish and shellfish that have invaded the area to prevent them from swimming through the sea, and unlike when using conventional nets, it is dependent on ocean conditions such as tide level, tide, water depth, etc., and weather conditions such as typhoons. It is possible to reliably block the swimming of fish and shellfish without causing any damage, and the labor and cost required for maintaining nets can be reduced, making it extremely effective for large-scale aquaculture such as at marine farms. The effect is extremely large.
また、通電を所定の時間ごとに断続することに
より、魚貝類の遊泳を遮断できると同時に、消費
電力を大幅に低減することができる。 Moreover, by intermittent energization at predetermined intervals, swimming of fish and shellfish can be interrupted, and at the same time, power consumption can be significantly reduced.
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図は通電時間と電位傾斜との関係図、第
２図は原理説明図、第３図は他の実施例の動作説
明図である。
２ａ，２ｂ……電極、４……対象物。
The drawings show an embodiment of the method for blocking the swimming of fish and shellfish according to the present invention, and FIGS. 1 and 2 show one embodiment. FIG. 3 is an explanatory diagram of the operation of another embodiment. 2a, 2b... Electrode, 4... Target object.
Claims (1)
類の遊泳遮断方法において、海水中に電位傾斜と
通電時間との積が0.1〔Ｖ・sec／cm〕以上になる
ような領域を形成することを特徴とする魚貝類の
遊泳遮断方法。[Scope of Claims] 1. In a method for blocking the swimming of fish and shellfish in seawater, a method for blocking the swimming of fish and shellfish in seawater is such that the product of the potential gradient and the current application time is 0.1 [V·sec/cm] or more. A method for blocking swimming of fish and shellfish, characterized by forming a region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61012675A JPS62171629A (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 |
|---|---|---|---|
| JP61012675A JPS62171629A (en) | 1986-01-23 | 1986-01-23 | Method for blocking swimming of fishes and shellfishes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62171629A JPS62171629A (en) | 1987-07-28 |
| JPH0440973B2 true JPH0440973B2 (en) | 1992-07-06 |
Family
ID=11811947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61012675A Granted JPS62171629A (en) | 1986-01-23 | 1986-01-23 | Method for blocking swimming of fishes and shellfishes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62171629A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0358724A (en) * | 1989-07-27 | 1991-03-13 | Hitachi Zosen Corp | Interrupting equipment for swimming of fish and shellfishes |
-
1986
- 1986-01-23 JP JP61012675A patent/JPS62171629A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62171629A (en) | 1987-07-28 |
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|---|---|---|---|
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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