JP5288546B2 - Aquaculture equipment for hanging larvae - Google Patents
Aquaculture equipment for hanging larvae Download PDFInfo
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- JP5288546B2 JP5288546B2 JP2008227299A JP2008227299A JP5288546B2 JP 5288546 B2 JP5288546 B2 JP 5288546B2 JP 2008227299 A JP2008227299 A JP 2008227299A JP 2008227299 A JP2008227299 A JP 2008227299A JP 5288546 B2 JP5288546 B2 JP 5288546B2
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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
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- 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
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Description
本発明は、タイラギの垂下養殖に使用する養殖用器具及び該養殖用器具を使用する養殖方法に関する。 The present invention relates to an aquaculture device used for hanging culture of Japanese larvae and an aquaculture method using the aquaculture device.
特許文献１または２に記載されるように、アサリやアカガイ、トリガイ等、通水性に優れた飼育カゴの中に基質を配し、それぞれの貝の脚による潜砂行動に由来する埋設型の垂下養殖方法は従来から存在した。
比較的小型の貝は、少量の基質で潜砂行動をとれる為飛出し行動は起き難いが、タイラギの垂下養殖の場合、基質を使用しても、以下の理由から基質上への殻体露出が起きてフジツボ等の付着物による弊害で養殖は困難であった。
大型の二枚貝であるタイラギの場合、その特徴的な三角錐様の形状は潜砂し易い形状ではあるが、反面、殻体の開閉の度に、開閉で生じた隙間に基質が侵入し、上方へ押し上げられる力が生じる、そこで、常に殻体を基質内に保持する為には、足糸による大量の基質への付着が必要である。
垂下養殖で粒径が均一で比重の軽いアンスラサイト等を基質として使用した場合、大型の貝は基質だけでは殻体の保持移動が困難な為、基質上へ露出する結果となり、フジツボなどの付着を招いていた。
As described in Patent Document 1 or 2, a substrate is placed in a cage with excellent water permeability, such as clams, scallops, triggers, etc. Culture methods have existed for some time.
Although relatively small shellfish can dive with a small amount of substrate, it is difficult to jump out. However, in the case of tailing culture of Japanese larvae, even if the substrate is used, the shell body is exposed on the substrate for the following reasons. It was difficult to cultivate due to the bad effects caused by barnacles and other deposits.
In the case of a large bivalve snail, its characteristic triangular pyramid-like shape is easy to submerge, but on the other hand, every time the shell opens and closes, the substrate enters the gap created by opening and closing, Therefore, in order to keep the shell in the substrate at all times, attachment to a large amount of substrate by foot thread is necessary.
When using anthracite with a uniform particle size and light specific gravity as a substrate in drooping culture, large shellfish are difficult to hold and move with the substrate alone, and as a result, they are exposed on the substrate, causing adhesion of barnacles, etc. Was invited.
タイラギの基質への潜砂行動は一種の付着物防御行動であるが、基質を使用した垂下養殖の場合、1貝あたりに必要な基質が多い為、垂下重量の増大を招き、大型の浮体構造物を必要とする。また、揚吊など作業上の重量制約もある為、養殖器あたりの収容貝数にも大きな制約を受ける等、経済性を考えた場合に問題があった。 The action of submersible sand on the substrate of a Japanese larvae is a kind of fouling protection, but in the case of drooping culture using a substrate, there is a large amount of substrate required per shell, which increases the drooping weight and causes a large floating structure I need a thing. In addition, since there are weight restrictions on work such as lifting and lifting, there is a problem when considering the economy, such as the number of shells contained per aquaculture device is greatly restricted.
＜従来の方法では畜養は出来ても稚貝から成貝までの一貫した養殖は不可能＞
従来でもタイラギを垂下飼育することは行われている。例えば、特許文献３に記載されるような専用のコンテナーにタイラギを入れフロート筏に垂下する方法が提案されている。しかし、貝柱は若干成長するものの、殻体の成長はほとんど認められていない。殻体成長が要件ではない成貝を採集して一時的に「蓄養」する事は出来ても、「養殖」の必須要件である殻体の成長即ち、小さな稚貝からの一貫した成長育成は、上述した従来方法では解決されていなかった。
<Conventional farming from juveniles to adults is not possible even with livestock farming using conventional methods>
In the past, larvae have been kept in drooping. For example, a method has been proposed in which a tie is placed in a dedicated container as described in Patent Document 3 and is suspended on a float trough. However, although scallops grow slightly, almost no growth of shells has been observed. Although adult shellfish whose shell growth is not a requirement can be collected and temporarily cultivated, shell growth, which is an essential requirement for aquaculture, that is, consistent growth and development from small larvae However, the conventional method described above has not been solved.
＜従来の方法では、タイラギに致命的な付着物除去を避けられない＞
タイラギの垂下養殖における重要な要件の一つは付着物対策である。前記特許文献３にも、付着物除去方法について簡単な記述があるが、タイラギは殻が薄く、殻が閉まりきらない形状などから、従来、真珠貝養殖やカキ養殖等の垂下養殖において実施されていた高圧洗浄による直接除去法や液体の浸透圧差を利用した淡水処理法や濃塩水処理法などは使用出来ない。このため、フジツボやイガイなどの殻体蝶番付近への直接付着を防止することは、タイラギを養殖をする上で大きな課題となっている。
<With conventional methods, it is inevitable to remove deadly deposits on the flounder>
One of the important requirements in the hanging culture of Japanese larvae is countermeasures against deposits. Although the patent document 3 also has a simple description of the deposit removal method, the larvae are conventionally practiced in drooping cultures such as pearl shell culture and oyster culture because they have a thin shell and the shell does not close completely. The direct removal method using high-pressure washing, the fresh water treatment method using concentrated osmotic pressure, and the concentrated salt water treatment method cannot be used. For this reason, preventing direct adhesion to the vicinity of shell hinges such as barnacles and mussels has become a major issue in cultivating larvae.
＜付着物による弊害−１＞
さらに、タイラギと同じ餌料を接餌する海洋性生物の大量付着は、タイラギ成長の大きな弊害となる。
<Defects caused by deposits-1>
In addition, the massive attachment of marine organisms that feed on the same feed as that of a Japanese willow is a major negative effect on the growth of Japanese willow.
＜付着物による弊害−２＞
養殖容器表面もしくは内部への付着物による目詰りなど通水性の阻害は、養殖容器内部の急速な水質悪化をまねく。
<Defects caused by deposits-2>
Inhibition of water flow, such as clogging due to deposits on or inside the culture vessel, leads to rapid deterioration of the water quality inside the culture vessel.
＜基質の必要性＞
自然界におけるタイラギの基質への潜砂行動は一種の付着物への自己防衛行動であると考えられる。前述のようにタイラギへの事前の付着物防御は、基質を使用する以外には困難である。
<Necessity of substrate>
It is thought that the nature of submersible action on the substrate of the larva in nature is a kind of self-defense action against deposits. As mentioned above, pre-adhesion protection against lentils is difficult except by using a substrate.
＜基質を使用した際の経済性について＞
基質を使用した垂下養殖場合は1貝あたりに必要な基質が多い為、垂下重量の増大を招き、大型の浮体構造物を必要とする。また、揚吊など作業上の重量制約もある為、養殖器あたりの収容貝数にも大きな制約を受ける等、経済性を考えた場合の問題があった。
<Economic efficiency when using a substrate>
In the case of drooping culture using a substrate, since a large amount of substrate is required per shell, it causes an increase in droop weight and requires a large floating structure. In addition, since there are weight restrictions on work such as lifting and lifting, there are problems when considering economic efficiency, such as the number of shells contained in a culture device is also greatly restricted.
＜基質を使用した際の飛出し行動による付着物＞
大型の二枚貝であるタイラギの場合、その特徴的な三角錐様の形状は潜砂し易い形状ではあるが、反面、殻体の開閉の度に、開閉で生じた隙間に基質が侵入し、上方へ押し上げられる力が生じる、そこで、常に殻体を基質内に保持する為には、足糸による大量の基質への付着が必要である。垂下養殖で粒径が均一で比重の軽いアンスラサイト等を基質として使用した場合、大型の貝は基質だけでは殻体の保持移動が困難な為、基質上へ露出する結果となり、フジツボなどの付着を招いていた。
また、安定した海底と違い、常に波浪による上下振動のある垂下養殖において、泥や砂などの基質を使用した場合、粒径の異なった基質が波浪振動によって固くしまることで物理的に潜砂行動が困難となる危険性があった。
In the case of a large bivalve snail, its characteristic triangular pyramid-like shape is easy to submerge, but on the other hand, every time the shell opens and closes, the substrate enters the gap created by opening and closing, Therefore, in order to keep the shell in the substrate at all times, attachment to a large amount of substrate by foot thread is necessary. When using anthracite with a uniform particle size and light specific gravity as a substrate in drooping culture, large shellfish are difficult to hold and move with the substrate alone, and as a result, they are exposed on the substrate, causing adhesion of barnacles, etc. Was invited.
In addition, unlike a stable seabed, when a substrate such as mud or sand is used in drooping aquaculture that always vibrates up and down due to waves, the substrate with different particle size becomes physically hardened by wave vibration, so that There was a risk that it would be difficult to act.
本発明は、上記問題点を解消することを目的とし、垂下養殖において、タイラギを基質内に確実に潜砂させることを特徴とし、タイラギ殻体への付着物を防御し、成長させるために使用するタイラギ専用のタイラギ養殖器具を提供するものである。 The present invention aims to solve the above-mentioned problems, and is characterized in that the larva is surely submerged in the substrate in the hanging culture, and is used to protect and grow the deposits on the larva shell. The purpose of this is to provide tailor-raising farming equipment.
すなわち本発明は、基質を使用した防汚処理養殖用容器内に専用の足糸固定器を設置することにより、タイラギを確実に基質内に潜砂させることを特徴とするタイラギ専用の養殖用器具である。 That is, the present invention provides a culture instrument for exclusive use of Japanese larvae, characterized in that a dedicated foot thread fixing device is installed in a container for antifouling treatment culture using a substrate, so that the larva is surely submerged in the substrate. It is.
本発明の態様は以下のとおりである。
（１）養殖用容器内にタイラギの飛出し防止を目的とした足糸固定器を基質とともに配置したことを特徴とするタイラギ養殖用器具
（２）養殖用容器が防汚処理済のタイラギ養殖用カゴであることを特徴とする（１）記載のタイラギの養殖用器具。
（３）基質がアンスラサイトであることを特徴とする（１）または（２）記載のタイラギの養殖用器具。
（４）（１）ないし（３）の何れかに記載の器具を使用することを特徴とするタイラギの垂下養殖方法。
Aspects of the present invention are as follows.
(1) An apparatus for cultivating larvae, characterized in that a foot thread fixing device for the purpose of preventing the release of larvae is placed in the aquaculture container together with a substrate. (2) For larvae culturing where the aquaculture container has been antifouled. The apparatus for cultivating Japanese larvae according to (1), which is a cage.
(3) The apparatus for cultivating Japanese larvae according to (1) or (2), wherein the substrate is anthracite.
(4) A method for drooping cultivation of Japanese larvae, characterized in that the instrument according to any one of (1) to (3) is used.
本発明によれば、タイラギの垂下養殖において基質中に専用の足糸固定器を入れることにより、アンスラサイトなどの軽量基質を使用しても、砂や砂泥を使用しても、タイラギの基質上への浮上を確実に防止することができ、タイラギ殻体へのフジツボなどの海洋生物の付着を防御することができるので、タイラギの生存率が大きく向上する。
このように、本発明によれば、従来は困難であった基質を用いたタイラギの垂下養殖を可能とし、殻体を安定させることによる成長が期待できる。
また、本発明の養殖用器具を使用すれば、タイラギの稚貝から成貝まで高い生存率で養殖することができるので、タイラギの稚貝から成貝まで一貫した養殖が可能となる。
According to the present invention, by using a special foot thread fixer in the substrate in the hanging culture of Japanese larvae, whether using a lightweight substrate such as anthracite, sand or sand mud, Ascending to the top can be surely prevented, and marine organisms such as barnacles can be prevented from adhering to the snail shell, so that the survival rate of snails is greatly improved.
As described above, according to the present invention, it is possible to perform hanging culture of Japanese larvae using a substrate that has been difficult in the past, and growth by stabilizing the shell can be expected.
Moreover, if the aquaculture apparatus of the present invention is used, it is possible to cultivate from a larva juvenile to an adult oyster with a high survival rate, and therefore, it is possible to consistently cultivate a larva juvenile to an adult mussel.
本発明につき詳しく説明する。
本発明で養殖の対象とするタイラギはハボウキガイ上科ハボウキガイ科に属し、学術名をAtrina pectinata lisckeanaと称する二枚貝である。貝殻のとがった方（殻頂）を下にし、海底基質に潜砂埋在して生息する。脚の付近から、絹糸状足糸をたくさん出して砂粒や小石を付着させて体を固定する。砂泥の上には殻の後端部がわずかに顔を出すのみである。有鱗型（通称ケンタイラギ）は州や沿岸域などの浅海部（主に砂質）に多く、それに対して無鱗型（通称ズベタイラギ）はやや深い海域（主に泥質）に生息する。産卵期は夏で、産み出された卵は海中に放出され、同じく放出された***と受精する。ふ化した幼生はしばらく海中を漂いながら成長し、やがて着底潜砂埋在する。成長は早く、2年後には殻長が１５cmを超える。タイラギは殻長が通常２年貝で１５〜２０ｃｍ、4年貝で３０ｃｍに達し、その貝柱は２年貝で５〜２０ｇ、直径は４ｃｍ、4年貝で５０〜１５０ｇ、直径７ｃｍに達する。
The present invention will be described in detail.
The larva to be cultured according to the present invention is a bivalve that belongs to the genus Coleoptera, and has the scientific name Atrina pectinata lisckeana. With the pointed end of the shell (the top of the shell) facing down, it inhabits the submarine embedded in submarine sand. From the vicinity of the legs, a lot of silk-like foot threads are put out and sand particles and pebbles are attached to fix the body. On the sand and mud, the rear end of the shell is only slightly exposed. Scaled type (commonly known as Kentairagi) is abundant in shallow seas (mainly sandy) such as states and coastal areas, while scaleless type (commonly known as Zubeiragira) lives in somewhat deep waters (mainly mud). The egg-laying season is summer, and the eggs are released into the sea and fertilized with the released sperm. The hatched larva grows while drifting in the sea for a while, and eventually lies in the bottom. The growth is fast, and the shell length exceeds 15 cm after two years. The oysters usually have a shell length of 15-20 cm for a 2 year shellfish and 30 cm for a 4 year shellfish, and 5-20 g, a diameter of 4 cm for a 2 year shellfish, 50-150 g for a 4 year shellfish, and a diameter of 7 cm.
本発明の養殖に用いるタイラギは、人工採苗もしくは天然採苗で得られた浮遊幼生を育成した稚貝を使用するか、もしくは干潟で採捕した稚貝を使用することができる。 The larva used for the culture of the present invention can use juveniles grown from floating larvae obtained from artificial seedlings or natural seedlings, or juveniles collected from tidal flats.
本発明の養殖用器具は、防汚処理を施すことが好ましい。使用する防汚塗料は貝類の育成に害を与える薬剤を含まないシリコーン系またはフッ素系の塗料の中から適宜選択する事ができるが、特にシリコーン系の塗料が好ましく、中でも特開平3-20370号公報に記載された防汚塗料が好ましい。この塗料の塗布は、例えば上塗り塗装としてシリコーン塗料を、下塗り塗装としてアクリル塗装を用い、それぞれドブ付け法等の公知の方法によって行なうことができる。 The culture instrument of the present invention is preferably subjected to antifouling treatment. The antifouling paint to be used can be appropriately selected from silicone-based or fluorine-based paints that do not contain chemicals that are harmful to the growth of shellfish, but silicone-based paints are particularly preferred, and in particular, JP-A-3-20370 Antifouling paints described in the publication are preferred. The coating can be performed by a known method such as a dove method using, for example, a silicone coating as the top coating and an acrylic coating as the undercoating.
本発明でタイラギの養殖用容器としては、足糸固定器を配した基質を安定して保持でき、基質表面が海水と自由に接触するよう開放されているものであれば、形状を問わないが、前述のシリコーン系付着防止剤で防汚処理を施したタイラギ養殖カゴが好ましく用いられる。タイラギ養殖カゴとは、射出成形品及び通常枠体と網状物とから形成されている。網状物を構成する材料としては公知の材料の中から適宜選択して使用することができるが、特にポリエチレン、ポリプロピレン等のポリオレフィン、ナイロン等のポリアミド、ポリエチレンテレフタレート等のポリエステル、ＡＢＳ、塩化ビニル及び塩化ビニリデン等の高分子材料を使用することが好ましい。これらのうちでは、ポリアミドまたはポリ塩化ビニル等を原料としたモノフィラメントを編んで編み籠状としたものが特に好ましい。 In the present invention, as a container for cultivating Japanese larvae, any shape can be used as long as it can stably hold the substrate on which the foot fixing device is disposed and the substrate surface is open so as to freely contact seawater. A tiger cultivated basket that has been subjected to an antifouling treatment with the aforementioned silicone-based anti-adhesive agent is preferably used. A tailor-cultured basket is formed of an injection-molded product and a normal frame and a net-like material. The material constituting the reticulate can be appropriately selected from known materials and used, but particularly polyolefins such as polyethylene and polypropylene, polyamides such as nylon, polyesters such as polyethylene terephthalate, ABS, vinyl chloride, and chloride. It is preferable to use a polymer material such as vinylidene. Of these, a monofilament made of polyamide, polyvinyl chloride or the like as a raw material is knitted into a braided shape.
養殖用容器は、容器内の水質の点から編み籠状のように多少透水性を有するものの方が好ましいが、２〜３ｃｍの稚貝から１０ｃｍ程度まで成育させる中間養殖のような比較的短期間の養殖であれば、透水性のない容器であっても使用できる。 The aquaculture container is preferably slightly permeable like a braided cocoon from the viewpoint of the water quality in the container, but it is a relatively short period of time such as intermediate aquaculture that grows from 2-3 cm larvae to about 10 cm. Can be used even if it is a non-permeable container.
荒天時にタイラギ養殖カゴが反転して貝が落下しないように、本発明の養殖容器の開口部付近に通水面積の広い立体的なザル状の蓋を前述の防汚塗料で防汚処理して使用することが好ましい。 In order to prevent the snails from turning over during stormy weather, the three-dimensional colander-shaped lid with a wide water flow area is treated with the antifouling paint in the vicinity of the opening of the culture container of the present invention. It is preferable to use it.
本発明で使用するタイラギ専用の飛出し防止を目的とした足糸固定器は、タイラギの足糸が通過でき、足糸に絡みついた基質が通過できない目開きのものであれば形状は問わず、トリカルネット（登録商標）、ラッセル織プラスチック網、三打ち蛙、クレモナ網、２−３ｃｍの突起が形成された動物よけプラスチックシートのような網目状の成形品などが好ましく利用できる。足糸固定器を構成する材料としては、タイラギに対して無害なものであればいずれでもよく、公知の材料の中から適宜選択して使用することができるが、特にポリエチレン、ポリプロピレン等のポリオレフィン、ナイロン等のポリアミド、ポリエチレンテレフタレート等のポリエステル、ＡＢＳ、塩化ビニル及び塩化ビニリデン等の高分子材料を使用することが好ましい。 The foot thread fixer for the purpose of preventing the jumping out of the tailrail used in the present invention is not limited to any shape as long as the foot thread of the tailer can pass through and the substrate entangled with the foot thread cannot pass through. Tricarnet (registered trademark), a Russell woven plastic net, a triple punch, a Cremona net, a mesh-like molded product such as a plastic sheet for animals formed with 2-3 cm protrusions, and the like can be preferably used. As a material constituting the foot fixing device, any material may be used as long as it is harmless to Japanese larvae and can be appropriately selected and used from known materials. Particularly, polyolefins such as polyethylene and polypropylene, It is preferable to use a polymer material such as polyamide such as nylon, polyester such as polyethylene terephthalate, ABS, vinyl chloride, and vinylidene chloride.
例えばタイラギ専用の足糸固定器１として基質底部にトリカルネット（登録商標）のような透水性のある平面様のシートを配した場合、図３に示されるように、タイラギの足糸３は、トリカルネット（登録商標）の網目を通過して基質２を捉えるので、足糸が基質のみを捉えた状態より、基質内での付着抵抗を増加させて、高い確率で基質内への潜砂行動を保持できる。
したがって、本発明の足糸固定器１は、養殖用容器５内でタイラギ４の下方に配置することが好ましい。
For example, when a flat sheet with water permeability such as Tricarnet (registered trademark) is arranged at the bottom of the substrate as a foot thread fixing device 1 exclusively for the tying, as shown in FIG. Since the substrate 2 is captured through the Tricarnet (registered trademark) mesh, the adhesion resistance in the substrate is increased compared to the state in which the foot thread captures only the substrate, and the latent resistance in the substrate is increased with high probability. Preserve sand behavior.
Therefore, it is preferable to arrange the foot anchor 1 of the present invention below the tyringe 4 in the aquaculture container 5.
本発明の養殖方法で貝を養殖する海水中での養殖器具の垂下位置は、海況条件の変化によって可変する事が好ましい。また、強い潮の流れや波浪のない場所で養殖することが望ましい。 It is preferable that the drooping position of the aquaculture equipment in the seawater where the shellfish are cultivated by the aquaculture method of the present invention can be changed according to changes in sea conditions. It is also desirable to cultivate where there is no strong tide or waves.
本発明の養殖方法では、養殖用器具は、好ましくは錨で係留された養殖筏、ブイ等から海中に沈めて吊りロープの上端を海上に係留してある筏あるいはブイに連結し、海中に沈めた状態に支持することにより垂下された状態で使用される。養殖用器具を垂下する方法としては、使用する幹綱や吊線などのロープ資材やフロートなどの浮体構造物に前述の防汚塗料で防汚処理を施す事が好ましい。 In the aquaculture method of the present invention, the aquaculture equipment is preferably submerged from aquaculture trough, buoy or the like moored with a salmon and the upper end of the hanging rope is connected to the anchor or buoy anchored on the sea, and submerged in the sea. It is used in a state where it is suspended by supporting it in a standing state. As a method for suspending the aquaculture equipment, it is preferable to perform antifouling treatment with the above-mentioned antifouling paint on a rope structure such as trunk rope or suspension line or a floating structure such as a float.
本発明の養殖方法によるタイラギの養殖時期は、限定されない。 There is no limitation on the time for cultivating Japanese larvae according to the culture method of the present invention.
本発明の養殖方法による基質の粒度や材質については、アンスラサイト、砂、泥などがあるが、タイラギが潜入出来るものであれば特に限定されない。作業性を考えるのであれば比重の軽いアンスラサイトの使用が好ましい。 There are anthracite, sand, mud, and the like as to the particle size and material of the substrate produced by the cultivation method of the present invention, but there is no particular limitation as long as it can infiltrate the flounder. If workability is considered, it is preferable to use anthracite having a low specific gravity.
次に実施例を挙げて本発明の効果について更に詳しく説明するが、本発明はこれらの実施例になんら限定されるものではない。
[実施例１]
Next, although an example is given and the effect of the present invention is explained in detail, the present invention is not limited to these examples at all.
[Example 1]
長崎県産人工種苗稚貝１２４個体について平成１９年２月２６日から基質（アンスラサイト）を入れたカゴに足糸固定器として目開き２．１ｍｍのトリカルネット（登録商標）を用いて垂下飼育した結果（図１）、試験開始時平均殻長５．４ｃｍの貝は、１２月初旬に生残率が約９０％で平均殻長１４．７ｃｍ（最大殻長１７．６ｃｍ）まで成長した。この間の垂下飼育期間は２７９日であった。
[実施例２]
About 124 artificial seedling larvae produced in Nagasaki Prefecture, suspended from a cage containing a substrate (anthracite) on February 26, 2007 using a Tricarnet (registered trademark) with a 2.1 mm mesh as a foot anchor As a result of rearing (FIG. 1), the shells with an average shell length of 5.4 cm at the start of the test grew to an average shell length of 14.7 cm (maximum shell length of 17.6 cm) with a survival rate of about 90% in early December. . The drooping period during this period was 279 days.
[Example 2]
長崎県産天然成貝３９貝を平成１９年８月１９日から基質（アンスラサイト）を入れたカゴに実施例１と同じ足糸固定器を用いて垂下飼育した結果（図２）、試験開始時の平均殻長１８．７ｃｍ平均貝柱重量７．５ｇから１０月に平均殻長１９．８ｃｍ平均貝柱重量１４．８ｇ、１２月２０日で平均殻長２０．０ｃｍ平均貝柱重量２８．０ｇ（最大３９．２ｇ）へと成長した。この間の垂下飼育期間は１２３日であった。
[実施例３]
As a result of dredging 39 natural shellfish produced in Nagasaki Prefecture in the cage containing the substrate (anthracite) from August 19, 2007 using the same foot thread fixator as in Example 1 (Fig. 2), start of the test The average shell length of 18.7 cm and the average shell length of 7.5 g from October to the average shell length of 19.8 cm and the average shell length of 14.8 g, the average shell length of 20.0 cm and the average shell weight of 28.0 g on December 20 (maximum It grew to 39.2 g). The drooping period during this period was 123 days.
[Example 3]
熊本県産天然成貝１１０貝を平成１９年１０月２６日から基質（アンスラサイト）を入れたカゴに実施例１と同じ足糸固定器を用いてＡ．Ｂの２箇所に分けて垂下飼育したところ、試験開始時の平均殻長１７．５ｃｍ平均貝柱重量５．９ｇから、Ａ平均貝柱重量５．９ｇ、Ｂ平均貝柱重量１３．８ｇ（最大１７．９ｇ）へと増加した。この間の垂下飼育期間は８４日であった。 Using the same foot thread fixing device as in Example 1 on a cage containing a substrate (anthracite) from Kumamoto Prefecture natural shellfish 110 shellfish from October 26, 2007. When B was reared and divided into two locations, the average shell length at the start of the test was 17.5 cm, the average shell weight was 5.9 g, the A average shell weight was 5.9 g, and the B average shell weight was 13.8 g (up to 17.9 g). ). The drooping period during this period was 84 days.
［参考例１］
佐賀県産天然稚貝１０９貝と長崎県産人工採苗稚貝３０貝を平成１８年１１月３０日から３分目合の三角ちょうちんネットを用いて垂下飼育したところ、試験開始時の平均殻長６．４ｃｍから４月１９日で６．５ｃｍと殆ど成長しなかった。この間の垂下飼育期間は１４０日であった。養殖期間中の貝の生存率は約５３％であった。
[Reference Example 1]
109 shells of natural scallops from Saga Prefecture and 30 shells from Nagasaki Artificial seedlings were bred using a triangular lantern net for 3 minutes from November 30, 2006. The average shell at the start of the test There was almost no growth from 6.4 cm in length to 6.5 cm on April 19th. The drooping period during this period was 140 days. The survival rate of shellfish during the cultivation period was about 53%.
［参考例２］
平成１９年８月２１日から平成１９年１０月１日まで、長崎県諫早市小長井町沖の試験漁場において小長井産天然貝４９個体を用いて足糸固定器を使用しないで飼育試験を行った。その結果、殻体の基質中への潜砂が困難となり貝が基質上に露出した。露出面には大量のフジツボが付着し１５個体が斃死した。フジツボはタイラギ殻の内側に付着し殻体開閉を困難にしたために斃死に至ったものと考えられる。
[Reference Example 2]
From August 21, 2007 to October 1, 2007, a breeding test was conducted using 49 natural shellfish from Naganaga Prefecture, Isahaya City, Naganaga-cho, using natural shellfish from Konagai without using a foot anchor. As a result, it was difficult to submerge the shell body into the substrate, and the shellfish were exposed on the substrate. A large number of barnacles adhered to the exposed surface, and 15 individuals died. Barnacles are thought to have drowned because they were attached to the inner side of the holly shell and made it difficult to open and close the shell.
１：足糸固定器
２：基質
３：足糸
４：タイラギ
５：タイラギ養殖用カゴ
1: Foot thread fixing device 2: Substrate 3: Foot thread 4: Tairagi 5: Tairagi culture basket
Claims (4)
A hanging culture method for a Japanese larch characterized by using the instrument according to any one of claims 1 to 3.
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