JP2763356B2 - Artificial reefs for infants - Google Patents
Artificial reefs for infantsInfo
- Publication number
- JP2763356B2 JP2763356B2 JP1320281A JP32028189A JP2763356B2 JP 2763356 B2 JP2763356 B2 JP 2763356B2 JP 1320281 A JP1320281 A JP 1320281A JP 32028189 A JP32028189 A JP 32028189A JP 2763356 B2 JP2763356 B2 JP 2763356B2
- Authority
- JP
- Japan
- Prior art keywords
- frame
- reef
- artificial
- infants
- corner
- 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 - Fee Related
Links
Classifications
-
- 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
Landscapes
- Artificial Fish Reefs (AREA)
- Farming Of Fish And Shellfish (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は鮒、もろこ等の淡水魚類の幼稚仔を保護育
成するための人工保護礁に関する。The present invention relates to an artificial reef for protecting and raising juveniles of freshwater fish such as crucian carp and moroko.
鮒、もろこ類の幼稚仔は湖沼等の岸辺に群生する葦、
藻等の隙間でふ化し、生体に至るまでその付近を棲息の
場としている。これは多くの外敵から身を守ることがで
き、付近に餌料となる藻類やプランクトン等が多く存在
するためである。しかしながら、近年、淡水湖沼岸には
葦類の群生する地域が減少し、これら幼稚湖の棲息する
場は失われつつある。さらに、外敵となるブラックバス
等の大型魚は増えつつあり、幼稚仔が充分に自立して外
敵から身を守る力がつくまでの間に損耗して成体に達す
るのは意外に少ない。これらの有用魚類資源の増殖を図
るためには、ふ化した幼稚仔の棲息場を確保する保護礁
が必要となっている。Crucifers and moromis are reeds that grow on the shores of lakes and marshes.
It hatches in the gaps of algae, etc., and the surrounding area is a habitat until it reaches the living body. This is because they can protect themselves from many external enemies, and there are many algae, plankton, and the like serving as food nearby. However, in recent years, the area where freshwater reeds grow on the banks of freshwater lakes and marshes has decreased, and the habitats of these kindergarten lakes are disappearing. In addition, the number of large fish, such as black bass, which are foreign enemies, is increasing, and it is surprisingly unlikely that infants will become worn and reach adulthood until they become fully self-sustaining and have the ability to protect themselves from external enemies. In order to proliferate these useful fish resources, it is necessary to provide a reef that secures a habitat for hatched larvae.
幼稚仔を保護し、資源の増殖を目的とした従来の保護
礁は、格子状枠体、もしくは筒状蛇籠等を組合せ、外敵
からの蔭となるかくれ場所のみの構造体となっていた。
しかし、外敵は一定の体形のものと限らず、大きいもの
から、比較的小さなものものまで混在している。従来の
このような、一定の格子目合をもった保護礁では、その
格子目合以下の外敵な容易に保護礁内に入ることがで
き、保護礁としての機能を発揮できない。また、ふ化し
た幼稚仔は自然環境下では湖底近くの繊細な植物の枝葉
に付着する形で生息し餌料を得ていることが多く、従来
の保護礁はこの様な幼稚仔に対する機能が備わっていな
かった。Conventional reefs that protect infants and proliferate resources have a lattice-shaped frame or a cylindrical gabion, etc., and have a structure that is hidden only by hidden enemies.
However, external enemies are not limited to those of a fixed body shape, and are mixed from large to relatively small ones. Such a conventional reef having a fixed lattice size can easily enter the protected reef with an enemy less than the lattice size, and cannot function as a protective reef. In addition, hatched larvae often live in the natural environment and adhere to the leaves of delicate plants near the lake bottom to obtain food, and conventional protective reefs have functions for such larvae. Did not.
この発明は上記の従来の問題点を解消すべく考え出さ
れたものであり、あらゆる大きさの外敵からも幼稚仔を
保護する機能をもち、かつ、ふ化直後の幼稚仔の付着棲
息場として好適な環境を形成できる幼稚仔の人工保護礁
を提案するにある。The present invention has been conceived to solve the above-mentioned conventional problems, and has a function of protecting a baby from an enemy of any size, and is suitable as an attachment habitat for a baby immediately after hatching. The aim is to propose an artificial reef for infants that can create a safe environment.
この幼稚仔の人工保護礁は、水中に設置し、淡水魚類
の幼稚仔を保護する人工保護礁であって、上面に2つの
枠体面が鋭角に交り、その下端に空間幅が広い所から連
続的に狭くなった谷形の隅角部を有し、枠体上面は粗面
をなし、その枠体上面には連続する多数の細かい間隙を
備えていることを特徴とする。This artificial reef for infants is an underwater reef that is installed underwater and protects the infants of freshwater fish. The two frame surfaces meet at an acute angle on the upper surface, and the space at the lower end is wide. It has a continuously narrowed valley-shaped corner, the upper surface of the frame has a rough surface, and the upper surface of the frame has a large number of continuous fine gaps.
第1,2図は湖底に沈設した実施例の人工保護礁であ
り、平面をなす枠体1、6枚に山形に組合せてなり、上
面に2つの枠体1,1面が交ってなった断面角度θが鋭角
な谷形をした隅角部2を有している。枠体1は格子状を
なし上面に多数の幅1cmの帯状合成樹脂製の人工埴毛板
3を1cmの間隔を保ち横方向に並列に固着し、枠体1上
面を粗面とするとともに、増毛板3,3間に間隙4を形成
している。また、人工埴毛板3は組織が比較的に粗であ
って、水や水中に浮遊する土砂等が透過できる細かい小
間隙を有し、その表面に土砂等が堆積することが防止さ
れている。なお、枠体1の下端の稜間には隅角度の角度
θを保持するため固定桟5が取付けてある。Figs. 1 and 2 show the artificial reef of the embodiment submerged at the bottom of a lake. The cross-sectional angle θ has an acute valley-shaped corner portion 2. The frame 1 has a lattice shape, and a large number of 1 cm-wide artificial clay bristle plates 3 made of a band-like synthetic resin are fixed on the upper surface side by side in parallel at a 1 cm interval to make the upper surface of the frame 1 rough. A gap 4 is formed between the bristles 3,3. In addition, the artificial clay board 3 has a relatively coarse tissue, and has fine small gaps through which water and sediment floating in the water can pass, so that sediment and the like are prevented from being deposited on the surface thereof. . Note that a fixed bar 5 is attached between the ridges at the lower end of the frame 1 to maintain the angle θ of the corner angle.
幼稚仔の外敵は体長が20〜30cmのものから1〜2cmの
ものまで多種類にわたっている。体長が1〜2mmの幼稚
仔は20〜30cmの外敵の食害にあう場合が多い。これら全
ての外敵に適応するためには隅角部2の空間幅が広い所
から連続的に狭くなっていることが機能として要求され
ている。There are many types of infant enemies, ranging in length from 20-30 cm to 1-2 cm. Infants with a body length of 1 to 2 mm are often attacked by external enemies of 20 to 30 cm. In order to adapt to all these external enemies, it is required as a function that the space width of the corner 2 is continuously narrowed from a wide place.
この人工保護礁は、外敵に遭遇した際に幼稚仔が逃げ
込む空間として角度が鋭角な隅角部を有し、幼稚仔は外
敵の体形に適応して捕獲されない狭い所まで逃げ込むこ
とができる。隅角部の角度θは90゜以下であり、好まし
くは70゜以下、より好ましくは50゜以下である。20゜以
下では保護礁の単位材料当りの占有面積が少なくなり、
経済的に不利となる。また、90゜以上では外敵の体形と
幼稚仔の体形の関係から保護される確率が低下する。最
も好ましくは40゜前後である。This artificial reef has a sharp angled corner as a space for a child to escape when encountering an external enemy, and the child can adapt to the shape of the external enemy and escape to a narrow place that is not captured. The angle θ of the corner is 90 ° or less, preferably 70 ° or less, more preferably 50 ° or less. If it is less than 20 mm, the occupation area per unit material of the reef will decrease,
Economically disadvantageous. On the other hand, if the angle is 90 ° or more, the probability of being protected from the relationship between the external enemy's physique and the child's physique decreases. Most preferably, it is around 40 °.
この人工保護礁を構成する枠体上面は粗面をなし、餌
料が付着し安いものでなくてはならない。植毛板、人工
芝生等が好適であるが、これらに限定されるものではな
い。The upper surface of the frame that constitutes this artificial reef must be rough and must be cheap, with food attached. Flocked boards, artificial grass and the like are suitable, but not limited thereto.
枠体上面において連続する間隙は、水の流通がよく、
水柱を浮遊する土砂あるいはゴミ等が透過でき、枠体上
面への堆積が防止できるものでなくてはならない。間隙
の幅は20mm〜1mm、好ましくは15〜5mmであり、隅角部下
方に設けることにより有効に機能する。実施例のように
帯状の植毛板を間隔を保ち並列に固着し、植毛板間に間
隙を設けると共に、植設板にも細かい小間隙を設ける
と、植毛板上への浮遊物の堆積が一層確実に防止でき、
かつ、餌料となる生物類の定着、成育を促進し、幼稚仔
の棲息場として一層好適な条件を満すことができる。The continuous gap on the top of the frame has good water flow,
It must be capable of transmitting sediment and dust floating on the water column and preventing accumulation on the upper surface of the frame. The width of the gap is 20 mm to 1 mm, preferably 15 to 5 mm, and it works effectively when provided below the corner. As in the embodiment, the band-shaped flocking boards are fixed in parallel while keeping an interval therebetween, and a gap is provided between the flocking boards, and a fine small gap is also provided on the implanting board. Can be reliably prevented,
In addition, it promotes the establishment and growth of living organisms serving as food, and can satisfy more favorable conditions as a habitat for infants.
この保護礁の形状は前記したものに限るものではな
い。第3図のごとく鉛直面をなす枠体1と傾斜面をなす
枠体1とを組合せ角度θが鋭角な隅角部2がある鋸歯形
となしてもよい。第4図のごとく、断面が半円弧形をな
す枠体1′を接して組合せ、円弧面が接してなった角度
θが鋭角をなす隅角部2がある連続円弧形となしてもよ
い。なお、この場合の角度θは対向する2つの接線が交
わる角度であり、0<θ<90゜の範囲がこの発明でいう
隅角部2となる。また、第5図のごとく、上面に平板部
6がある山形とすることもできる。The shape of the reef is not limited to the above. As shown in FIG. 3, the frame body 1 forming a vertical plane and the frame body 1 forming an inclined surface may be formed in a sawtooth shape having a corner 2 having an acute angle θ. As shown in FIG. 4, a frame 1 'having a semi-circular cross-section is brought into contact with and combined with the frame 1' to form a continuous arc having a corner 2 at which the angle θ at which the arc surfaces come into contact is an acute angle. Good. In this case, the angle θ is an angle at which two opposed tangents intersect, and the range of 0 <θ <90 ° is the corner 2 in the present invention. Further, as shown in FIG. 5, a mountain shape having a flat plate portion 6 on the upper surface can be employed.
この保護礁は通常、その高さは100cm以下であり、好
ましくは70〜50cmである。20cm以下は面積が狭くなりす
ぎ、好ましくない。This reef is usually less than 100 cm in height, preferably 70-50 cm. If it is less than 20 cm, the area becomes too small, which is not preferable.
この人工保護礁を構成する枠体は格子状枠体のほか、
矩形状枠体、簀の子状枠体等の通水性があるものであ
る。金属、繊維強化合成樹脂(FRP)、木材等を素材と
することができ、水流、波浪等の力に耐え、その構造を
保持し得るものであればよい。The frame that constitutes this artificial reef is a lattice frame,
It has a water permeability, such as a rectangular frame and a ladder frame. Any material can be used as long as it can be made of metal, fiber reinforced synthetic resin (FRP), wood, or the like, can withstand the forces of water currents, waves, and the like, and can maintain its structure.
通常この人工保護礁は水底に、そのまま沈設するが、
水底が砂泥層等の軟弱地盤の場合は、支持脚等を用いて
固定して設置し、沈下防止が図られる。Normally, this artificial reef is submerged under the water,
When the water bottom is soft ground such as a sand mud layer, it is fixed and installed using support legs or the like to prevent settlement.
第1図に示した高さ70cm、隅角度角度θ=40゜、FRP
製の人工保護礁を大形水槽中に沈設し、ふ化後約1週間
のもろこ稚魚数百匹を放流し、その後、体長2〜3cmの
ブラックバス数匹を同じ水槽中に放った。70cm height, corner angle θ = 40 °, FRP shown in Fig. 1
An artificial protective reef made of a steel was placed in a large water tank, and several hundred moroko fry about one week after hatching were released, and then several black baths 2-3 cm long were released into the same water tank.
もろこの稚魚は保護礁隅角部内に多く蝟集し、ブラッ
クバスの捕食から逃れ得ることが目視で観察することが
できた。It was observed visually that the fry of this morsel flocked in the corner of the reef and could escape from black bass predation.
この人工保護礁はその上面に空間幅が広い所から連続
的に狭くなった谷形の隅角部を有し、隅角部が幼稚仔の
逃げ場となるため、幼稚仔をあらゆる大きさの外敵から
保護することができ、同時に間隙がある粗面をなす上面
には餌料となる生物類が定着繁茂して、幼稚仔の育成に
好適な環境で形成できる。This artificial reef has a valley-shaped corner that narrows continuously from a wide space on the upper surface, and the corner serves as a escape for the child. At the same time, the living organisms serving as food can colonize and grow on the rough upper surface with gaps, and can be formed in an environment suitable for breeding infants.
また、粗面をなす枠体上面に、間隙が形成されている
ことで、枠体上面に土砂やゴミ等が堆積することが防止
される。In addition, since the gap is formed on the upper surface of the rough frame, sediment, dirt, and the like are prevented from being deposited on the upper surface of the frame.
また、この人工保護礁は湖、沼の水底のほか湖、沼、
河川等の護岸に組込み設置して、その機能を発揮するこ
とができる。In addition, this artificial reef has a lake, swamp,
It can be installed and installed on revetments such as rivers to demonstrate its function.
第1,2図はこの発明になる人工保護礁の斜視図および側
面図、第3,4,5図はそれぞれこの人工保護礁の異なる形
状例を示す側面図である。 1……枠体、2……隅角部、3……人工植毛板、4……
間隙、5……固定棧、6……平板部。1 and 2 are a perspective view and a side view of an artificial reef according to the present invention, and FIGS. 3, 4 and 5 are side views showing examples of different shapes of the artificial reef. 1 ... frame, 2 ... corner, 3 ... artificial flocking board, 4 ...
Gap, 5: fixed joint, 6: flat plate.
Claims (1)
る人工保護礁であって、上面に2つの枠体面が鋭角に交
り、その下端に空間幅が広い所から連続的に狭くなった
谷形の隅角部を有し、枠体上面は粗面をなし、該枠体上
面には連続する多数の細かい間隙を備えてなることを特
徴とする幼稚仔の人工保護礁。1. An artificial reef installed underwater for protecting a freshwater fish larva, wherein two frame surfaces intersect at an acute angle on an upper surface, and a narrow space is continuously narrowed from a wide space at a lower end thereof. An artificial protective reef for a kindergarten, characterized by having a trough-shaped corner portion, an upper surface of the frame body being rough, and having a large number of continuous fine gaps on the upper surface of the frame body.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1320281A JP2763356B2 (en) | 1989-12-08 | 1989-12-08 | Artificial reefs for infants |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1320281A JP2763356B2 (en) | 1989-12-08 | 1989-12-08 | Artificial reefs for infants |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03180130A JPH03180130A (en) | 1991-08-06 |
JP2763356B2 true JP2763356B2 (en) | 1998-06-11 |
Family
ID=18119753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1320281A Expired - Fee Related JP2763356B2 (en) | 1989-12-08 | 1989-12-08 | Artificial reefs for infants |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2763356B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102318569A (en) * | 2011-04-26 | 2012-01-18 | 青岛恒生源生态农业有限公司 | Double-layer three-dimensional sea cucumber inhabitation cage for culture pond |
Families Citing this family (5)
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---|---|---|---|---|
CN103168712B (en) * | 2012-12-13 | 2014-07-16 | 浙江海洋学院 | Artificial reef group constructed utilizing waste bottles |
CN103070103B (en) * | 2012-12-13 | 2014-06-11 | 浙江海洋学院 | Artificial fish reef convenient for attaching algae |
CN103168715B (en) * | 2012-12-13 | 2014-07-16 | 浙江海洋学院 | Aquatic organism habitat device constructed manually |
CN103430885B (en) * | 2013-08-29 | 2014-10-01 | 中国水产科学研究院黄海水产研究所 | Multi-layer combined type stereoscopic holothurian culture adhesion substrate and combination method thereof |
CN108157237A (en) * | 2016-12-07 | 2018-06-15 | 张朋万 | A kind of cultural method of crucian |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4713179U (en) * | 1971-03-10 | 1972-10-16 | ||
JPS4733674U (en) * | 1971-04-15 | 1972-12-15 | ||
JPS498478U (en) * | 1972-04-29 | 1974-01-24 | ||
JPS58190336A (en) * | 1982-04-30 | 1983-11-07 | 酒伊繊維工業株式会社 | Fish bank used in breeding and growing fish and shellfish |
JPS58190335A (en) * | 1982-04-30 | 1983-11-07 | 酒伊繊維工業株式会社 | Fish bank used in breeding and growing fish and shellfish |
JPS59140822A (en) * | 1983-02-02 | 1984-08-13 | 三井造船株式会社 | Formation of algae field |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5494785U (en) * | 1977-12-16 | 1979-07-04 | ||
JPS58170961U (en) * | 1982-05-10 | 1983-11-15 | 酒伊繊維工業株式会社 | A fish reef used for collecting, protecting and breeding floating eggs and young floating fish and shellfish. |
JPS59178057U (en) * | 1983-05-17 | 1984-11-28 | 株式会社 東京久栄 | artificial reef |
-
1989
- 1989-12-08 JP JP1320281A patent/JP2763356B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4713179U (en) * | 1971-03-10 | 1972-10-16 | ||
JPS4733674U (en) * | 1971-04-15 | 1972-12-15 | ||
JPS498478U (en) * | 1972-04-29 | 1974-01-24 | ||
JPS58190336A (en) * | 1982-04-30 | 1983-11-07 | 酒伊繊維工業株式会社 | Fish bank used in breeding and growing fish and shellfish |
JPS58190335A (en) * | 1982-04-30 | 1983-11-07 | 酒伊繊維工業株式会社 | Fish bank used in breeding and growing fish and shellfish |
JPS59140822A (en) * | 1983-02-02 | 1984-08-13 | 三井造船株式会社 | Formation of algae field |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102318569A (en) * | 2011-04-26 | 2012-01-18 | 青岛恒生源生态农业有限公司 | Double-layer three-dimensional sea cucumber inhabitation cage for culture pond |
Also Published As
Publication number | Publication date |
---|---|
JPH03180130A (en) | 1991-08-06 |
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Legal Events
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LAPS | Cancellation because of no payment of annual fees |