JP3662060B2 - Squid spawning reef - Google Patents
Squid spawning reef Download PDFInfo
- Publication number
- JP3662060B2 JP3662060B2 JP00151096A JP151096A JP3662060B2 JP 3662060 B2 JP3662060 B2 JP 3662060B2 JP 00151096 A JP00151096 A JP 00151096A JP 151096 A JP151096 A JP 151096A JP 3662060 B2 JP3662060 B2 JP 3662060B2
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- JP
- Japan
- Prior art keywords
- spawning
- squid
- substrate
- egg
- reef
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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- Artificial Fish Reefs (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、人工魚礁としてのイカ類の産卵礁に関するものである。
【０００２】
【従来の技術】
従来、イカ類の産卵の場を人工的に造成し、産卵量を増やすことによって資源を増大するための人工魚礁が知られている。
【０００３】
イカ類は天然海域では岩棚の下面に産卵する。イカ類産卵用の人工魚礁はこの習性を模倣したもので、平板からなる産卵用の基質を１段から数段設置したものが、種々用いられてきた（例えば、実開昭５９−１７２５６４号公報参照）。
【０００４】
【発明が解決しようとする課題】
しかしながら、これまでのイカ類産卵用の魚礁は、産卵用基質として単なる平板を用いるものが一般的であり、イカ類の産卵習性を十分把握して設計されたものではない。
【０００５】
また、平板の産卵用基質では長期間経過すると、付着物、特にカキ類やホヤ類で覆われてしまい、イカ類が産卵することが不可能になる。
【０００６】
さらに、この種の人工魚礁は、設置状態における安定性や、製作面、材料面での経済性を考慮し、一体成形のコンクリートブロックを用いることが多い。その場合、複雑な形状は得られ難く、把握した産卵習性を設計に反映させることができる自由度が小さいといった問題がある。
【０００７】
本発明は、上述のような課題の解決を図ったものであり、カキ類やホヤ類の付着物をできるだけおさえ、かつイカ類の産卵が良好に行われるイカ類の産卵礁を提供することを目的としている。
【０００８】
本発明は、魚礁を構成する枠体の上部または中間部に、下面がイカ類産卵用の付着面となる平面的な広がりを有する産卵用基質を設けてなるイカ類の産卵礁において、前記産卵用基質として、枠体の上部より光が入ることのできるような格子状、スリット状または穴状の空間部を全面に形成した産卵用基質を設けてなるものである。
【０００９】
イカ類産卵用の付着面をカキ類、ホヤ類などが覆ってしまえば、イカ類の産卵が行われなくなることはよく知られている。このカキ類の付着にはある一定の付着面積を必要とする。また、ホヤ類の幼生は負の走行性を示し、暗部には付着するものの、明るいところには付着しない。一方、イカ類は特に面積には関わらず、産卵する。
【００１０】
本発明者は、上記の知見を元に鋭意研究の結果、カキ類、ホヤ類などが付着し難く、かつイカ類の産卵が容易に行われる形状を発見し、本発明をなすに到ったものである。
【００１１】
本発明の産卵用基質の遮蔽部の幅はホヤ類の付着防止を第一義に考えた場合、横方向からの光の入り込みを考慮すればよく、あまり大きくないある程度の幅で十分である。また、大きすぎると中心部が暗くなりその効果が薄れる。遮蔽部の形状は、板状でも円形あるいは角形断面でもよい。また、空間部は光が十分入る幅であればよい。あまり大きすぎればその効果が低くなる。
【００１２】
次に、カキ類の付着防止を第一義に考えた場合は、遮蔽部の幅は極力小さい方がよいが、あまり小さすぎるとイカ類の産卵に適さなくなる。遮蔽部の形状は円形断面が望ましいが、板状でも角形断面でもよい。空間部はカキ類の大きさに比べて約半分以上あればよい。
【００１３】
すなわち、ホヤ類の付着防止を第一義に考えた場合は、遮蔽部の幅は５ｃｍ〜５０ｃｍ程度で、格子状、スリット状または穴状の空間部の幅は５ｃｍ〜５０ｃｍ程度が望ましい（請求項２に対応）。
【００１４】
カキ類の付着防止を第一義に考えた場合は、遮蔽部の幅は０．５ｃｍ〜５ｃｍ程度で、格子状、スリット状または穴状の空間部の幅は５ｃｍ以上あればよい（請求項３に対応）。
【００１５】
本発明で用いる産卵用基質の材質はガラス繊維あるいは高弾性係数の繊維で補強した合成樹脂（ＦＲＰ）、あるいは鋼材、特に樹脂ライニングした鋼板類等を用いることが望ましい。またコンクリートで構成することも勿論可能である。
【００１６】
枠体部分の材質は、安定性、経済性等の面からコンクリート製のものが望ましいが、必ずしも限定する必要はない。
【００１７】
産卵用基質の枠体への取付けに関しては、例えば枠体を構成する柱部材あるいは枠体上部に固定する。産卵用基質は、１つの枠体に対し数段に取り付けることも可能であり、さらに、枠体を複数段積み重ねることも可能である。
【００１８】
産卵用基質を取り付ける角度は、水平がもっとも望ましいが、４５度程度まで傾いてもよい。産卵用基質の枠体への取付け方法としては、枠体の一部に埋め込むことも可能であり、また、ボルト等の取付け具で取り付けることも可能である。
【００１９】
【発明の実施の形態】
以下本発明の実施形態について、図面を用いて説明する。
【００２０】
図１は本発明のイカ類の産卵礁の一実施形態を示したものである。この例では、コンクリート製の直方体の枠体１の上部に、平面的に広がる格子状の産卵用基質２を水平に取り付けてある。
【００２１】
産卵用基質の格子を形成する部材の断面形状は、図２に示すように円形でも、図３に示すように角形でも、あるいは板状でもよい。
【００２２】
図２の格子状の産卵用基質２ａを構成する円形断面の部材の径は１ｃｍであり、格子間隔は５ｃｍである。また、産卵用基質２ａ全体の平面形は、一辺の長さが１５０ｃｍの正方形となっており、コンクリート製の枠体１の上部に埋め込まれている。
【００２３】
図３の格子状の産卵用基質２ｂを構成する角形断面の部材の辺の長さは１ｃｍであり、格子間隔は５ｃｍである。産卵用基質２ｂ全体の平面形は、一辺の長さが１５０ｃｍの正方形であり、コンクリート製の枠体１の上面に対し、産卵用基質２ｂの外縁部３をボルト４で取り付けてある。コンクリート製枠体１の平面形における一辺の長さも１５０ｃｍである。
【００２４】
図４は本発明の他の実施形態を示したものであり、産卵用基質２ｃとしてＦＲＰ製の平板にスリット５を形成したものを用いている。
【００２５】
産卵用基質２ｃのスリット５の幅は、スリット部が５ｃｍで遮蔽部としての板部が１０ｃｍで連続している。また、この例では、コンクリート製枠体１の上面に２枚の産卵用基質２ｃをボルト４で取り付けており、１枚の産卵用基質２ｃ全体の寸法は１５０ｃｍ×７５ｃｍの長方形となっている。コンクリート枠体１の一辺の長さは１５０ｃｍである。
【００２６】
図５は本発明のイカ類の産卵礁のさらに他の実施形態を示したものであり、産卵用基質２ｄとしてＦＲＰ製の平板に多数の穴６を形成したものを用いている。
【００２７】
産卵用基質２ｄの穴６の径は５ｃｍで、穴６どうしの間隔は１０ｃｍで連続している。産卵用基質２ｄ全体の一辺の長さは１５０ｃｍの正方形をしており、コンクリート製の枠体１の上部と中間部に埋め込まれている。
【００２８】
【発明の効果】
本発明の基質をもったイカ類の産卵礁は、枠体の上部より光が入ることのできるような格子状、スリット状または穴状の空間部を全面に形成した産卵用基質を設けてなるため、カキ類や、幼生が負の走行性を示すホヤ類の付着がほとんどみられず、イカ類の産卵のみがみられる。
【００２９】
本発明の基質をもったイカ類の産卵礁は、基質部に空間があるため、上下方向の通水性がよく、産卵されたイカ類の卵のふ化率が平板状の基質をもったイカ類の産卵礁に比べて明らかに高い。
【００３０】
また、本発明のイカ類の産卵礁では、枠体部分と産卵用基質部分を別個に製作することができ、産卵用基質の形状を工夫することでイカ類の産卵習性を設計に十分反映させることができる。
【図面の簡単な説明】
【図１】 本発明のイカ類の産卵礁の一実施形態を示す斜視図である。
【図２】 産卵用基質の格子を構成する部材の断面が円形であり、かつ枠体に埋め込まれている場合の断面図である。
【図３】 産卵用基質の格子を構成する部材の断面が角形であり、かつ産卵用基質が枠体の上面に取り付けられている場合の断面図である。
【図４】 本発明のイカ類の産卵礁の他の実施形態を示したもので、(a) は平面図、(b) は正面図である。
【図５】 本発明のイカ類の産卵礁のさらに他の実施形態を示したもので、(a) は平面図、(b) は鉛直断面図である。
【符号の説明】
１…コンクリート枠体、２，２ａ，２ｂ，２ｃ，２ｄ…イカ類産卵用基質、３…外縁部、４…ボルト、５…スリット、６…穴[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a squid spawning reef as an artificial fish reef.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, artificial reefs for increasing resources by artificially creating a spawning ground for squids and increasing the amount of spawning are known.
[0003]
Squids lay eggs on the bottom of the ledge in natural waters. Artificial fish reefs for squid laying eggs mimic this behavior, and various types of laid egg-laying substrates with one to several stages have been used (for example, Japanese Utility Model Publication No. 59-172564). reference).
[0004]
[Problems to be solved by the invention]
However, fish reefs for spawning squid so far generally use a simple plate as a substrate for spawning, and are not designed with sufficient understanding of spawning habits of squids.
[0005]
In addition, when a flat egg-laying substrate is used for a long time, it is covered with deposits, particularly oysters and squirts, making it impossible for squids to lay eggs.
[0006]
Furthermore, this type of artificial reef often uses an integrally formed concrete block in consideration of the stability in the installation state and the economical efficiency in terms of production and materials. In that case, it is difficult to obtain a complicated shape, and there is a problem that the degree of freedom in which the grasped egg-laying behavior can be reflected in the design is small.
[0007]
The present invention has been made to solve the above-described problems, and provides a squid spawning reef that suppresses the deposits of oysters and squirts as much as possible, and that squid spawns well. It is aimed.
[0008]
The present invention relates to the spawning reef of squid, wherein the spawning reef is provided with an egg-laying substrate having a flat surface whose bottom surface is an attachment surface for squid spawning at the upper or middle part of the frame constituting the fish reef. The substrate for laying is provided with a substrate for laying eggs in which a lattice-like, slit-like or hole-like space part that allows light to enter from the upper part of the frame is formed on the entire surface.
[0009]
It is well known that if oysters, squirts, etc. cover the surface for spawning squid, squid will not lay eggs. A certain fixed area is required for the adhesion of the oysters. In addition, squirt larvae exhibit a negative running property and adhere to dark areas but do not adhere to bright places. On the other hand, squids lay eggs regardless of the area.
[0010]
As a result of diligent research based on the above findings, the present inventor has discovered a shape in which oysters, sea squirts, etc. are difficult to adhere and squids are easily laid, and the present invention has been made. Is.
[0011]
The width of the shielding part of the egg-laying substrate of the present invention should be considered to be the width of light that is not so large, considering the entrance of light from the lateral direction, considering the prevention of adhesion of ascidians. On the other hand, if it is too large, the center portion becomes dark and the effect is diminished. The shape of the shielding portion may be a plate shape, a circular shape, or a square cross section. Moreover, the space part should just be a width | variety into which light enters enough. If it is too large, the effect is reduced.
[0012]
Next, when the prevention of adhesion of oysters is considered primarily, the width of the shielding part should be as small as possible, but if it is too small, it will not be suitable for spawning squids. The shape of the shielding part is preferably a circular cross section, but may be a plate or a square cross section. The space should be about half or more than the size of oysters.
[0013]
That is, when the prevention of adhesion of sea squirts is primarily considered, the width of the shielding part is preferably about 5 cm to 50 cm, and the width of the lattice-like, slit-like or hole-like space part is preferably about 5 cm to 50 cm. Corresponds to item 2).
[0014]
When the prevention of the adhesion of oysters is primarily considered, the width of the shielding part is about 0.5 cm to 5 cm, and the width of the lattice-like, slit-like or hole-like space part should be 5 cm or more. 3).
[0015]
As a material for the egg-laying substrate used in the present invention, it is desirable to use a synthetic resin (FRP) reinforced with glass fiber or a fiber having a high elastic modulus, or a steel material, particularly a resin-lined steel sheet. Of course, it can be made of concrete.
[0016]
The material of the frame part is preferably made of concrete in terms of stability, economy, etc., but is not necessarily limited.
[0017]
Regarding the attachment of the egg-laying substrate to the frame, it is fixed to, for example, a column member constituting the frame or the upper part of the frame. The egg-laying substrate can be attached to several stages with respect to one frame, and the frames can be stacked in a plurality of stages.
[0018]
The angle at which the egg-laying substrate is attached is most preferably horizontal, but it may be inclined to about 45 degrees. As a method for attaching the egg-laying substrate to the frame body, it is possible to embed it in a part of the frame body, or it is possible to attach it with an attachment such as a bolt.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0020]
FIG. 1 shows an embodiment of the squid spawning reef of the present invention. In this example, a lattice-shaped egg-laying
[0021]
The cross-sectional shape of the member forming the lattice of the egg-laying substrate may be circular as shown in FIG. 2, rectangular as shown in FIG. 3, or plate shape.
[0022]
The diameter of the circular cross-section member constituting the lattice-shaped egg-laying substrate 2a in FIG. 2 is 1 cm, and the lattice spacing is 5 cm. The planar shape of the entire egg-laying substrate 2a is a square having a side of 150 cm, and is embedded in the upper part of the concrete frame 1.
[0023]
The length of the side of the member of the square cross section constituting the lattice-shaped egg-laying
[0024]
FIG. 4 shows another embodiment of the present invention, and an egg-laying
[0025]
The width of the
[0026]
FIG. 5 shows still another embodiment of the squid spawning reef of the present invention, in which an FRP flat plate made of a large number of
[0027]
The diameter of the
[0028]
【The invention's effect】
The squid spawning reef with the substrate of the present invention is provided with a spawning substrate in which a lattice-like, slit-like or hole-like space is formed on the entire surface so that light can enter from the upper part of the frame. For this reason, almost no oysters or squirrels with negative larvae running are observed, and only squid lay eggs.
[0029]
The squid spawning reef with the substrate of the present invention has a space in the substrate portion, so that the water permeability in the vertical direction is good, and the hatching rate of the spawned squid eggs has a flat substrate. Obviously higher than the spawning reefs of
[0030]
Further, in the squid spawning reef of the present invention, the frame part and the spawning substrate part can be manufactured separately, and the spawning habits of the squid are fully reflected in the design by devising the shape of the spawning substrate. be able to.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a squid spawning reef of the present invention.
FIG. 2 is a cross-sectional view when a member constituting a lattice of an egg-laying substrate has a circular cross section and is embedded in a frame.
FIG. 3 is a cross-sectional view in the case where a member constituting the lattice of the egg-laying substrate has a square cross section and the egg-laying substrate is attached to the upper surface of the frame.
FIG. 4 shows another embodiment of the squid spawning reef of the present invention, in which (a) is a plan view and (b) is a front view.
FIG. 5 shows still another embodiment of the squid spawning reef of the present invention, wherein (a) is a plan view and (b) is a vertical sectional view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Concrete frame, 2, 2a, 2b, 2c, 2d ... Substrate for squid spawning, 3 ... Outer edge part, 4 ... Bolt, 5 ... Slit, 6 ... Hole
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00151096A JP3662060B2 (en) | 1996-01-09 | 1996-01-09 | Squid spawning reef |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00151096A JP3662060B2 (en) | 1996-01-09 | 1996-01-09 | Squid spawning reef |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09187189A JPH09187189A (en) | 1997-07-22 |
| JP3662060B2 true JP3662060B2 (en) | 2005-06-22 |
Family
ID=11503489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00151096A Expired - Lifetime JP3662060B2 (en) | 1996-01-09 | 1996-01-09 | Squid spawning reef |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3662060B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006254761A (en) * | 2005-03-16 | 2006-09-28 | Litoncosmo Co Ltd | Artificial fish bank and method for installing the same |
| CN100358418C (en) * | 2006-03-21 | 2008-01-02 | 中国海洋大学 | a squid spawning reef |
| CN102356763A (en) * | 2011-10-31 | 2012-02-22 | 中国水产科学研究院淡水渔业研究中心 | Carp nest |
| CN102599082B (en) * | 2011-11-07 | 2013-07-24 | 浙江省海洋水产研究所 | Square combined artificial fish reef |
| CN109362617A (en) * | 2018-11-15 | 2019-02-22 | 宁波大学 | A kind of breeding method for improving the quantity and quality of eggs laid by tabby squid |
| CN112243904B (en) * | 2020-09-10 | 2022-02-18 | 浙江省海洋水产研究所 | Combined cuttlefish egg attachment device |
| KR102555068B1 (en) * | 2023-02-23 | 2023-07-19 | 주식회사 수중생태기술연구소 | Spawning habitat creation device for sepia esculenta. |
-
1996
- 1996-01-09 JP JP00151096A patent/JP3662060B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09187189A (en) | 1997-07-22 |
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