JP3684442B2 - Red scallop seedling harvesting device, red scallop seedling production method, red scallop culture culm and scallop culture method - Google Patents

Red scallop seedling harvesting device, red scallop seedling production method, red scallop culture culm and scallop culture method Download PDF

Info

Publication number
JP3684442B2
JP3684442B2 JP2003168528A JP2003168528A JP3684442B2 JP 3684442 B2 JP3684442 B2 JP 3684442B2 JP 2003168528 A JP2003168528 A JP 2003168528A JP 2003168528 A JP2003168528 A JP 2003168528A JP 3684442 B2 JP3684442 B2 JP 3684442B2
Authority
JP
Japan
Prior art keywords
seedling
scallop
red
oyster
culture
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.)
Active
Application number
JP2003168528A
Other languages
Japanese (ja)
Other versions
JP2005000099A (en
Inventor
裕幸 松浦
Original Assignee
宮城県
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 宮城県 filed Critical 宮城県
Priority to JP2003168528A priority Critical patent/JP3684442B2/en
Publication of JP2005000099A publication Critical patent/JP2005000099A/en
Application granted granted Critical
Publication of JP3684442B2 publication Critical patent/JP3684442B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81Aquaculture, e.g. of fish

Description

【0001】
【発明の属する技術分野】
本発明は、アカガイ種苗の採苗器、アカガイ種苗生産方法、アカガイ養殖篭およびアカガイ養殖方法に関する。
【0002】
【従来の技術】
一般にアカガイの種苗生産では、生殖細胞の成熟を待って、温度上昇刺激によって親貝(成貝)に産卵誘発を促す。この方法によって得られた卵と精子を受精させる。受精後約24時間で貝殻を有する浮遊幼生に達するので、以後浮遊幼生の飼育を開始する。飼育には培養した植物プランクトンを投与する。14〜20日で殻長300μmに成長し付着期幼生となる。そこで、カキ殻を水槽底面に敷き詰め、水槽上部に棒を渡して吊るした短冊状に裁断した遮光幕を採苗器として水槽内に投入して幼生を付着させる。
【0003】
従来の採苗器は一本当たりの重量や飼育水の循環の面で飼育水槽に収容する数が限られるため,水槽当りの採苗効率が悪い。一水槽当たりの採苗器への付着率は、遮光幕で15%、カキ殻製で25%程度であり、採苗器を投入してもそれ自体に付着しない割合が高かった。また、これまでの採苗器は、海面での中間育成への移行作業や管理も手数と時間を要するという問題点があった。
【0004】
アカガイは,殻長が約3cmで付着生活を終了し,底生生活に移行することから,これ以降養殖用または放流用種苗として取り扱われる。
【0005】
養殖は,簡便法として篭養殖があり,稚貝をそのまま篭に収容して海中層で行なっている。養殖篭では、砂中と異なり、内部でアカガイが安定せずに転がるため、アカガイの特徴である貝殻表面の毛状の殻皮が剥げ落ち、また、ストレスによる成長悪化やへい死,貝殻表面へカキやイガイなどの着生,さらには身の色調の低下等が見られ,商品価値の低いものとなってしまう。
【0006】
また、海中垂下方式の養殖方法として、海底と同じ状態を作るためにタライに砂を入れて種苗を収容する方式(砂床垂下方式)が開発されている。この砂床垂下方式ではタライやコンテナの構造、素材から十分な耐荷重量が得られず多段にすることには限度があり,作業面でも大きな負担がかかり,少ない漁場面積で集約的に養殖管理することは難しい。
【0007】
全国各地では、鉄筋篭に種苗を入れて海底に沈める養殖方法が主流となっている。鉄筋篭は重量があるため,単位面積当たりの生産効率が悪く,しかも,重量が大きいので船等の設備も大掛かりなものとなっている。また、近年,底質の悪化等によって大量へい死が発生し大きな問題となっている。
【0008】
アカガイの生産においては、採苗の過程で、種苗生産の効率化,海中での中間育成の簡便化が求められ,さらに,養殖の過程で,養殖施設の改良による効率的な養殖方法の開発と品質の向上が求められており、種苗生産から増養殖までの一連の工程の労力軽減、集約的生産、作業の効率化、中間育成および養殖に適した装置の開発が望まれている。
【0009】
【発明が解決しようとする課題】
そこで、本発明は,アカガイの成長が従来技術に劣らず、商品価値が高く、より集約的な管理、省力化ができ、生産効率の向上を図ることができるアカガイ種苗の採苗器、アカガイ種苗生産方法、アカガイ養殖篭およびアカガイ養殖方法を提供することを目的とする。
【0010】
【課題を解決するための手段】
前記目的を達成するため、人工種苗生産の際に重要でありながら設置作業が煩雑であったこれまでの採苗器について、軽量化、水槽内での管理の容易さ、付着率の向上の3点に着目し、素材、構造の改善を行なった。
また,従来の養殖方法では、漁場の海底面だけを利用するために単位面積当たりの生産量に限界があった。そこで、その問題を解消するため,養殖用容器を軽量化し,容器一つ一つに海底と同様の状況を作り出すことにより,海面から垂直的に多段垂下を可能にし生産性および管理の簡便性を向上させ,さらに生産されたアカガイが海底から漁獲されたものと同じ品質を有するように開発を行なった。
【0011】
本発明に係るアカガイ種苗の採苗器は、比重が海水の比重以下の耐水性テープを複数回折り返して成るテープ束の複数を並列に間隔をあけて配置し、各テープ束の中間部を連結材で連結し、連結材の一端に重りを固定して成ることを、特徴とする。
【0012】
本発明において、採苗器は,軽量・頑強・清潔・高密度収容・扱いが容易である点を追求し,耐水性テープの素材がプラスチックテープから成ることが好ましい。連結材は、化学繊維糸から成ることが好ましい。
本発明に係るアカガイ種苗の採苗器は、海水に沈めたとき、重りを底に付けて水中で立ちあがる。このため、吊るす必要がないので、自在に水槽内に投入でき、施設資材費の低減を図ることができる。テープ束は、束状にしない場合に比べて表面積が広く、また、水槽内の水循環を妨げにくく,複数のテープ束で効率的な採苗が可能である。
【0013】
本発明に係るアカガイ種苗の採苗器は、貝殻を用いた従来の採苗器に比べて、軽量で軟らかなため,海面での中間育成に移行した際も稚貝を附着させたまま使用することができる。本発明に係るアカガイ種苗の採苗器によれば、アカガイの成長が従来技術に劣らず、商品価値が高く、より集約的な管理、省力化ができ、生残率の向上および生産効率の向上を図ることができる。
【0014】
本発明に係るアカガイ種苗生産方法は、前記の本発明に係る採苗器をアカガイ幼生が浮遊する海水に入れて前記採苗器でアカガイの採苗を行うことを特徴とする。
【0015】
本発明に係るアカガイ養殖篭は、毛足が2cm乃至5cmの起毛素材により篭の内側底部および内側側部が覆われていることを特徴とする。毛足の長さは、特に3cm前後が好ましい。起毛素材は、毛足が篭の内側に向けて伸びるように設けられる。
本発明に係るアカガイ養殖篭では、所定の長さの起毛素材により篭の内側底部および内側側部が覆われているため、収容した種苗が足糸を絡め、体を支持することができる。また、篭の内側底部に海底と同様の状況を形成することができる。
【0016】
本発明に係るアカガイ養殖篭は、多段に連結して、集約的に養殖することができる。本発明に係るアカガイ養殖篭によれば、アカガイの成長が従来技術に劣らず、商品価値が高く、より集約的な管理、省力化ができ、生産効率の向上を図ることができる。
【0017】
本発明に係るアカガイ養殖方法は、前記の本発明に係るアカガイ養殖篭の内部にアカガイ稚貝を入れて養殖することを特徴とする。
特に、本発明に係るアカガイ養殖方法は、前記の本発明に係る採苗器をアカガイ幼生が浮遊する海水に入れて前記採苗器でアカガイの採苗を行った後、前記採苗器に付着したアカガイ稚貝を前記の本発明に係るアカガイ養殖篭の内部に入れて養殖することが好ましい。
【0018】
【発明の実施の形態】
図1および図2は、本発明の実施の形態を示している。
図1(B)に示すように、アカガイ種苗の採苗器1の作成には,予め長さ約100cmに切断した漁網修繕用化学繊維糸2の一端に,重り3として沈子43gを結束したものと、長さ100cmに切断した幅約1cmの耐水性プラスチックテープ4を複数、用意する。耐水性プラスチックテープ4は、比重が海水および水の比重以下のナイロンテープから成る。図1(A)に示すように、テープ4を複数回、長さ10cmで折り返して、テープ束5を作る。このとき、テープ4にねじりを加え、輪を作りながら、テープ4を束ねるようにする。そのようなテープ束5を複数、例えば10個作る。
【0019】
作成した10個のテープ束5を先に用意した糸2に通し、それぞれを等間隔で離して配置する。糸2は、テープ束5の連結材となる。糸2の端を結び,テープ束5が抜けないようにする。こうして作成したアカガイ種苗の採苗器1は、テープ束5の複数を並列に間隔をあけて配置し、各テープ束5の中間部を連結材で連結し、連結材の一端に重り3を固定して成っている。アカガイ種苗の採苗器1は、表面積を広く保ちながら、海水循環を妨げにくい構造である。
【0020】
この採苗器1を用いたアカガイ種苗生産方法は、採苗器1をアカガイ幼生が浮遊する海水に入れて採苗器1でアカガイの採苗を行うものである。この採苗器1は,水槽内へ投入すると、重り3側を底に付けて、水槽底面から水中で自らの浮力により海藻状に垂直に立ちあがる。採苗器1は、吊るす必要がないので自在に水槽内へ投入できる。また,採苗器1は、プラスチックテープ4を束にして用いているため、表面積が広くかつ,水槽内の水循環も従来法より格段に向上する。これにより,採苗器1の底層から上層まで全ての層で効率的な採苗が可能となる。
【0021】
採苗器1では、従来の貝殻等の採苗器よりも軽量で,軟らかなため,海面での中間育成に移行した際も稚貝が附着したまま使用することができる。これにより、養殖篭の軽量化が図られ、中間育成施設も強固なものを必要とせず,施設資材費の低減に繋がる。また,この採苗器1は、中間育成篭内での稚貝の付着基質としての役割も充分に果たし,水通しも良好で,成長,生残率の向上も図ることができる。
【0022】
図2に示すように、アカガイ養殖篭10は、毛足が3cm程度の起毛素材11により篭の内側底部12および内側側部13が覆われている。この養殖篭10により,海面を鉛直的に活用し,省スペースで多量のアカガイを養殖し,天然漁場から漁獲されたものと同品質のものが得られる。
【0023】
アカガイ養殖篭10は、既成の養殖篭10を改良して製造することができる。既成の養殖篭10は、2つの丸いリングの底部12、側部13および上部を網14で覆って成っている。その代表的な養殖篭10は、規格2つ丸で、2本吊手15,15を有し、底面直径46cmである。アカガイ養殖篭10は、既成の養殖篭10の底網の全面に起毛した毛足3cmの絨毯を縫付け,その絨毯が篭の側面で約3〜5cm立ち上がるようにして作成した。なお、絨毯は、毛足が養殖篭10の内側に伸びるように取り付けられる。このアカガイ養殖篭10は、篭の底面および底面から3cm程側面を起毛素材11が覆うことにより、稚貝を受けとめる構造となっている。この底面の絨毯には,収容した種苗が足糸を絡め体を支持できる毛足の長さとして3cm程度の長さの毛足のものを用いた。なお、起毛素材11には、絨毯のほか、マット素材を用いてもよい。
【0024】
このアカガイ養殖篭10を用いたアカガイ養殖方法では、アカガイ養殖篭10の内部にアカガイ稚貝を入れて養殖する。アカガイ養殖方法では、前述の採苗器1をアカガイ幼生が浮遊する海水に入れてその採苗器1でアカガイの採苗を行った後、採苗器1に付着したアカガイ稚貝をアカガイ養殖篭10の内部に入れて養殖することが好ましい。
【0025】
これにより養殖した結果,篭の底面に自然に浮泥が沈積し,海底と同様の状況が形成され,貝殻表面および身の色調等,天然の海底で生育したものと同じ品質のアカガイを生産することが可能となった。アカガイは、起毛素材11の毛足の中に潜って体を支持する。篭のみで飼育した場合、アカガイの殻にはマガキ等が多数付着して、アカガイの成長を停滞させる原因となっていた。これに対し、アカガイ養殖篭10では、底が浮泥で覆われたことにより、殻に付着生物が殆どなく、アカガイは順調に成長することができる。アカガイ養殖篭10によれば、砂の無い養殖篭10の中で、アカガイ稚貝が自然姿勢を保ちながら生息することができる。
【0026】
この改良したアカガイ養殖篭10によるアカガイの成長や生残率を見ると,採苗から約2年で、商品として出荷できる殻長が7cm以上のサイズに達し,この成長は砂床垂下方式と比べても遜色なく,生残率は90%と向上した。
【0027】
養殖篭10は、その構造上、多段に連結することができ,施設が軽量であることから,この養殖篭10を用いることにより、集約的に養殖が可能となり,限られた養殖漁場を鉛直的に利用し,商品出荷できるサイズまで,従来法よりも集約的に,採算性を向上させて,アカガイを実用規模で養殖することが可能となった。養殖篭10は、浮泥堆積後の重量にも耐えることができ、海面へ引き上げるときには浮泥を網目から容易に外へ落とすことができる。
【0028】
現在、宮城県内ではアカガイ養殖が一部地域で定着し、漁家所得の向上につながっている。今後,この養殖はさらに発展していく方向にあり、これまでにない新しい養殖業として成立しつつある。また、この養殖漁業の一方で、本県はアカガイの漁船漁業も盛んに行なわれているものの、近年資源の枯渇が危惧されており,種苗放流による増殖の必要性も叫ばれている。前述のアカガイ種苗の採苗器1、アカガイ種苗生産方法、アカガイ養殖篭10およびアカガイ養殖方法を利用すれば,アカガイ養殖の地域拡大とともに放流後の生残率が高いより大型種苗の効率的な生産も可能である。さらに,現在西日本を中心に行なわれている海底沈設型のアカガイ養殖での大量へい死問題と海面の立体的活用,施設の軽量化が、本養殖手法を用いることで解消される可能性があり,この技術の全国的な広がりが予想される。
【0029】
【発明の効果】
本発明によれば、アカガイの成長が従来技術に劣らず、商品価値が高く、より集約的な管理、省力化ができ、生産効率の向上を図ることができるアカガイ種苗の採苗器、アカガイ種苗生産方法、アカガイ養殖篭およびアカガイ養殖方法を提供することができる。
【図面の簡単な説明】
【図1】本発明に係るアカガイ種苗の採苗器の(A)テープ束の製造方法を示す説明図、(B)正面図である。
【図2】本発明に係るアカガイ養殖篭の斜視図である。
【0028】
【符号の説明】
1 アカガイ種苗の採苗器
2 化学繊維糸
3 重り
4 プラスチックテープ
5 テープ束
10 アカガイ養殖篭
11 起毛素材
12 内側底部
13 内側側部
14 網
15 吊手
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a loggerhead seedling collecting device, a pearl oyster seedling production method, a pearl oyster culture rod, and a pearl oyster culture method.
[0002]
[Prior art]
In general, in the production of red scallop seedlings, the parental shellfish (adult) is induced to spawn by waiting for the germ cells to mature. The egg and sperm obtained by this method are fertilized. Since floating larvae with shells are reached approximately 24 hours after fertilization, breeding of floating larvae will be started. For culture, administer cultured phytoplankton. In 14-20 days, it grows to a shell length of 300 μm and becomes an attachment stage larva. Therefore, oyster shells are spread on the bottom of the aquarium, and a light-shielding curtain cut into a strip shape with a rod placed over the top of the aquarium is hung into the aquarium as a seedling device to attach larvae.
[0003]
Conventional seedling devices have a low seeding efficiency per tank because the number per seedling and the number of breeding water that can be accommodated in the breeding tank are limited. The rate of attachment to the seedling device per tank was about 15% with shading curtains and about 25% with oyster shells. In addition, the conventional seedling device has a problem in that it takes time and labor to shift to and manage intermediate growth at sea level.
[0004]
The red oysters are treated as seedlings for aquaculture or release since they have a shell length of about 3 cm and end their adherent life and shift to benthic life.
[0005]
There is a simple method of aquaculture, such as carp culture. In aquaculture pods, unlike the sand, the red oysters roll inside without being stable, and the shell of shells on the surface of the shells, which is a characteristic of the red oysters, is peeled off. The appearance of Japanese mussels and mussels, as well as the deterioration of the color of the body, are seen, resulting in low commercial value.
[0006]
In addition, as a submerged drooping method, a method (sand floor drooping method) has been developed in which sand is placed in tarai and seedlings are accommodated in order to create the same state as the seabed. With this sand-flooding method, sufficient load-bearing capacity cannot be obtained from the structure and materials of talai and containers, so there are limits to the number of stages, which places a heavy burden on the work surface and intensively aquaculture management with a small fishing area It ’s difficult.
[0007]
In all parts of the country, the mainstream is a method of aquaculture in which seedlings are placed in rebar rods and submerged. Reinforcing rods are heavy, so production efficiency per unit area is poor, and because the weight is large, facilities such as ships are large. In recent years, a large amount of death has occurred due to the deterioration of sediment, which is a major problem.
[0008]
In the production of red scallops, it is necessary to improve the efficiency of seed production and simplification of intermediate breeding in the sea during the seedling process. Improvement of quality is demanded, and it is desired to develop a device suitable for reducing the labor of a series of processes from seed production to aquaculture, intensive production, work efficiency, intermediate breeding and aquaculture.
[0009]
[Problems to be solved by the invention]
Therefore, the present invention provides a scallop seedling seedling device, a scallop seedling seedling that can increase the production efficiency of akagai, which is not inferior to conventional technology, has a high commercial value, can be intensively managed and labor-saving, and can improve production efficiency. An object is to provide a production method, a loggerhead culture rod and a loggerhead culture method.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned purpose, it is important to reduce the weight, ease of management in the aquarium, and improve the adhesion rate of the conventional seed-collecting device, which is important in the production of artificial seedlings but has been complicated. Focusing on this point, the material and structure were improved.
In addition, in the conventional aquaculture method, since only the sea bottom of the fishing ground is used, the production amount per unit area is limited. Therefore, in order to solve this problem, the weight of the aquaculture container is reduced, and each container creates a situation similar to the seabed, enabling multi-stage drooping vertically from the sea surface, improving productivity and ease of management. It was improved and developed so that the produced red oysters had the same quality as those caught from the seabed.
[0011]
The scallop seedling collecting device according to the present invention has a plurality of tape bundles formed by turning back a plurality of water-resistant tapes having a specific gravity equal to or less than the specific gravity of seawater and arranged in parallel at intervals, and connects the intermediate portions of the tape bundles. It is characterized in that it is connected with a material and a weight is fixed to one end of the connecting material.
[0012]
In the present invention, it is preferable that the seedling device is lightweight, robust, clean, high-density accommodation and easy to handle, and the water-resistant tape is preferably made of a plastic tape. The connecting material is preferably made of a chemical fiber yarn.
The scallop seedling collecting device according to the present invention stands up in water with a weight attached to the bottom when submerged in seawater. For this reason, since it is not necessary to suspend, it can be freely thrown into the water tank and the facility material cost can be reduced. The tape bundle has a large surface area compared to the case where the tape bundle is not formed into a bundle, and it is difficult to hinder water circulation in the water tank, and efficient seedling can be performed with a plurality of tape bundles.
[0013]
The scallop seedling seedling device according to the present invention is lighter and softer than the conventional seedling device using shells, so it is used with the larvae attached even when shifting to intermediate breeding at sea level. be able to. According to the scallop seedling harvesting device according to the present invention, the growth of akagai is not inferior to that of the prior art, the product value is high, more intensive management and labor saving are possible, the survival rate is improved, and the production efficiency is improved. Can be achieved.
[0014]
The method for producing a scallop seedling according to the present invention is characterized in that the seedling device according to the present invention is placed in seawater in which the scallop larvae float and the scallop is seeded with the seedling device.
[0015]
The scallop-cultured cocoon according to the present invention is characterized in that the inner bottom portion and the inner side portion of the cocoon are covered with a raised material having a hair foot of 2 cm to 5 cm. The length of the bristle is particularly preferably about 3 cm. The raised material is provided such that the hair feet extend toward the inside of the heel.
Since the inner bottom part and the inner side part of the cocoon are covered with the raised material of a predetermined length, the housed seedling can entangle the foot thread and support the body in the scallop-cultured cocoon according to the present invention. Moreover, the same situation as the sea bottom can be formed at the inner bottom of the coral.
[0016]
The scallop cultured culm according to the present invention can be cultivated in an intensive manner by being connected in multiple stages. According to the scallop cultured culm according to the present invention, the growth of the scallop is not inferior to that of the prior art, and the product value is high, more intensive management and labor saving can be achieved, and the production efficiency can be improved.
[0017]
The loggerhead culture method according to the present invention is characterized by cultivating a pearl oyster larvae in the oyster cultivating rod according to the present invention.
In particular, the loggerhead culture method according to the present invention is characterized in that the seedling device according to the present invention is placed in seawater where the oyster larvae float and the scallop is seeded with the seedling device and then attached to the seedling device. It is preferable to cultivate the scallop larvae that have been prepared by placing them in the scallop culture culm according to the present invention.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment of the present invention.
As shown in FIG. 1 (B), for the preparation of the scallop seedling seedling device 1, 43 g of sago as a weight 3 was bound to one end of a chemical fiber yarn 2 for repairing a fishing net that had been cut to a length of about 100 cm in advance. A plurality of water-resistant plastic tapes 4 having a width of about 1 cm and having a length of 100 cm are prepared. The water resistant plastic tape 4 is made of a nylon tape having a specific gravity equal to or lower than that of seawater and water. As shown in FIG. 1 (A), the tape 4 is folded back a plurality of times with a length of 10 cm to form a tape bundle 5. At this time, the tape 4 is twisted, and the tape 4 is bundled while making a ring. A plurality, for example ten, of such tape bundles 5 are made.
[0019]
Ten prepared tape bundles 5 are passed through the previously prepared thread 2 and are spaced apart at equal intervals. The yarn 2 serves as a connecting material for the tape bundle 5. The ends of the thread 2 are tied so that the tape bundle 5 does not come off. The oyster seedling seedling device 1 thus created arranges a plurality of tape bundles 5 at intervals in parallel, connects intermediate portions of each tape bundle 5 with a connecting material, and fixes a weight 3 to one end of the connecting material. It is made up. The scallop seedling harvester 1 has a structure that does not hinder the circulation of seawater while maintaining a large surface area.
[0020]
In this method for producing a scallop seedling using the seedling device 1, the seedling device 1 is placed in the seawater in which the oyster larvae float, and the seedling device 1 is used to harvest the red oyster. When the seedling device 1 is put into the aquarium, the weight 3 side is attached to the bottom, and the seedling device 1 rises vertically from the bottom of the aquarium in the shape of a seaweed by its own buoyancy. Since the seedling device 1 does not need to be hung, it can be freely put into the water tank. In addition, since the seedling device 1 uses the plastic tape 4 in a bundle, the surface area is large, and the water circulation in the water tank is significantly improved as compared with the conventional method. Thereby, efficient seedling is possible in all layers from the bottom layer to the upper layer of the seedling device 1.
[0021]
Since the seedling device 1 is lighter and softer than conventional seedling devices such as shells, it can be used with the juveniles attached even when shifting to intermediate growth on the sea surface. As a result, the weight of the cultured trough is reduced, and the intermediate breeding facility is not required to be strong, leading to a reduction in facility material costs. In addition, the seedling device 1 also sufficiently plays a role as a sticking substrate for juvenile shellfish in an intermediate breeding pot, has good water passage, and can improve growth and survival rate.
[0022]
As shown in FIG. 2, the inner shell 12 and the inner side 13 of the cocoon-cultured cocoon 10 are covered with a raised material 11 having a hair foot of about 3 cm. This cultured trough 10 uses the sea surface vertically, cultivates a large amount of red oysters in a space-saving manner, and obtains the same quality as those caught from natural fishing grounds.
[0023]
The oyster cultivated salmon 10 can be manufactured by improving the existing cultivated salmon 10. The ready-made aquaculture rod 10 is formed by covering the bottom portion 12, the side portion 13, and the upper portion of two round rings with a net 14. The typical aquaculture rod 10 is a standard double circle, has two suspensions 15 and 15, and has a bottom diameter of 46 cm. The red scallop cultured cocoon 10 was prepared by sewing a 3 cm-long raised hair carpet on the entire bottom net of the existing cultivated cocoon 10 so that the carpet stood about 3-5 cm on the side of the cocoon. The carpet is attached such that the hairs extend to the inside of the culture rod 10. This scallop-cultured cocoon 10 has a structure for receiving juveniles by covering the bottom surface of the cocoon and the side surface of the ridge about 3 cm from the bottom surface with the raised material 11. As the carpet on the bottom surface, a hairy foot having a length of about 3 cm was used as the length of the hairy foot that can accommodate the seedlings that are entangled with the foot thread and support the body. The raised material 11 may be a mat material in addition to a carpet.
[0024]
In the akagai culture method using the akagai culture pod 10, the oyster shells are placed in the oyster culture cultivar 10 and cultured. In the oyster culture method, the seedling device 1 described above is placed in the seawater where the oyster larvae float and the scallop is collected using the seedling device 1, and then the oyster shells attached to the seedling device 1 are used as the oyster shell. It is preferable to cultivate in the inside of 10.
[0025]
As a result of this cultivation, floating mud naturally deposits on the bottom of the coral, creating a situation similar to that of the seabed, producing shellfish surface and body color, etc. It became possible. The akagai dive into the raised foot of the raised material 11 to support the body. When bred alone, many oysters and other oysters adhered to the shell of the red oyster, causing the growth of the red oyster to stagnate. On the other hand, in the red oyster culture pod 10, the bottom is covered with floating mud, so that there are almost no attached organisms in the shell, and the red oyster can grow smoothly. According to the oyster cultivated cocoon 10, the pearl oyster larvae can live in the cultivated cocoon 10 without sand while maintaining a natural posture.
[0026]
Looking at the growth and survival rate of red oysters using this improved red oyster culture paddy 10, the shell length that can be shipped as a product has reached a size of 7 cm or more in about 2 years from seedling, and this growth is compared with the sand bed hanging method However, the survival rate improved to 90%.
[0027]
Due to its structure, the aquaculture rod 10 can be connected in multiple stages, and the facilities are lightweight. By using this aquaculture rod 10, aquaculture can be conducted intensively, and a limited aquaculture ground can be vertically connected. It has become possible to cultivate red oysters on a practical scale, improving the profitability more intensively than conventional methods, up to the size that can be used for shipping products. The cultured trough 10 can withstand the weight after the accumulation of floating mud, and when it is lifted to the sea surface, the floating mud can be easily dropped out from the mesh.
[0028]
At present, loggerhead aquaculture has become established in some areas in Miyagi Prefecture, leading to an increase in fishermen's income. In the future, this aquaculture is in the direction of further development and is being established as a new aquaculture industry that has never existed before. In addition to this aquaculture, the prefecture is also actively engaged in oyster fishing boat fishing, but in recent years there has been concern about the depletion of resources and the need for breeding by seedling release has been screamed. By using the above-mentioned loggerhead seedling harvester 1, akagai seedling production method, akagai cultivating rod 10 and akagai culturing method, efficient production of larger seedlings with higher survival rate after release as well as expansion of akagai culture area Is also possible. Furthermore, there is a possibility that the large-scale mortality problem, the three-dimensional utilization of the sea surface, and the lightening of the facilities in the seabed subsidence type loggerhead culture currently being conducted mainly in western Japan may be solved by using this culture method. This technology is expected to spread nationwide.
[0029]
【The invention's effect】
According to the present invention, the growth of the red oyster is not inferior to that of the prior art, has a high commercial value, can be more intensively managed and labor-saving, and can improve the production efficiency. A production method, a loggerhead culture rod and a loggerhead culture method can be provided.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory view showing a method for producing a tape bundle (A) and (B) a front view of a scallop seedling collecting device according to the present invention.
FIG. 2 is a perspective view of a scallop cultured culm according to the present invention.
[0028]
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Scallop seedling collecting device 2 Chemical fiber yarn 3 Weight 4 Plastic tape 5 Tape bundle 10 Red scallop cultured ridge 11 Brushed material 12 Inner bottom 13 Inner side 14 Net 15 Lifting hand

Claims (5)

  1. 比重が海水の比重以下の耐水性テープを複数回折り返して成るテープ束の複数を並列に間隔をあけて配置し、各テープ束の中間部を連結材で連結し、連結材の一端に重りを固定して成ることを、特徴とするアカガイ種苗の採苗器。A plurality of tape bundles formed by bending a plurality of water-resistant tapes whose specific gravity is equal to or less than the specific gravity of seawater are arranged in parallel at intervals, and the middle part of each tape bundle is connected with a connecting material, and a weight is attached to one end of the connecting material. A seedling collector for red scallop seedlings, characterized by being fixed.
  2. 請求項1記載の採苗器をアカガイ幼生が浮遊する海水に入れて前記採苗器でアカガイの採苗を行うことを特徴とするアカガイ種苗生産方法。2. A method for producing a red oyster seedling, wherein the seedling device according to claim 1 is placed in seawater in which red oyster larvae float and the red oyster is collected with the seedling device.
  3. 毛足が2cm乃至5cmの起毛素材により篭の内側底部および内側側部が覆われていることを特徴とするアカガイ養殖篭。An oyster culture cultivated rice cake, wherein the inner bottom portion and the inner side portion of the cocoon are covered with a brushed material having a hair foot of 2 cm to 5 cm.
  4. 請求項3記載のアカガイ養殖篭の内部にアカガイ稚貝を入れて養殖することを特徴とするアカガイ養殖方法。4. A method for cultivating a pearl oyster comprising cultivating a pearl oyster shellfish in the oyster culture cultivating rod according to claim 3.
  5. 請求項1記載の採苗器をアカガイ幼生が浮遊する海水に入れて前記採苗器でアカガイの採苗を行った後、前記採苗器に付着したアカガイ稚貝を請求項3記載のアカガイ養殖篭の内部に入れて養殖することを特徴とするアカガイ養殖方法。The scallop larvae attached to the seedling device after the seedling device according to claim 1 is placed in seawater in which flounder larvae float and the scallop is collected with the seedling device. A akagai culture method characterized in that it is cultivated by placing it in a cocoon.
JP2003168528A 2003-06-12 2003-06-12 Red scallop seedling harvesting device, red scallop seedling production method, red scallop culture culm and scallop culture method Active JP3684442B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003168528A JP3684442B2 (en) 2003-06-12 2003-06-12 Red scallop seedling harvesting device, red scallop seedling production method, red scallop culture culm and scallop culture method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003168528A JP3684442B2 (en) 2003-06-12 2003-06-12 Red scallop seedling harvesting device, red scallop seedling production method, red scallop culture culm and scallop culture method

Publications (2)

Publication Number Publication Date
JP2005000099A JP2005000099A (en) 2005-01-06
JP3684442B2 true JP3684442B2 (en) 2005-08-17

Family

ID=34093945

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003168528A Active JP3684442B2 (en) 2003-06-12 2003-06-12 Red scallop seedling harvesting device, red scallop seedling production method, red scallop culture culm and scallop culture method

Country Status (1)

Country Link
JP (1) JP3684442B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5288546B2 (en) * 2008-09-04 2013-09-11 独立行政法人水産総合研究センター Aquaculture equipment for hanging larvae
JP5370876B1 (en) * 2012-07-30 2013-12-18 石井商事株式会社 Shellfish egg material and shellfish seedling and culture methods using the same
CN104221972A (en) * 2014-10-05 2014-12-24 杨成胜 Tree-shaped artificial fish reefs
JP5944038B1 (en) * 2015-09-29 2016-07-05 ティビーアール株式会社 Rope for shellfish culture

Also Published As

Publication number Publication date
JP2005000099A (en) 2005-01-06

Similar Documents

Publication Publication Date Title
JP6074731B1 (en) Cultivation scallops and scallop culture method
CN103392675B (en) Stereoscopic comprehensive ecological culture method of multiple species in stichopus japonicus pond
JP2012167097A (en) Culture of sessile marine animals
CN101999328B (en) Rapana venosa ecological breeding method
CN101606497B (en) Three-level breeding method of Japanese scallops
CN103636540B (en) A kind of ecological early breeding method of Coilia ectenes in Yangtze River pond greenhouse
JP2008514231A (en) Methods for raising aquatic animals
CN101946720B (en) Artificial breeding method for tuba false fusus
CN102550457A (en) Early propagation method for hyriopsis cumingii seeds
KR101423301B1 (en) Apparatus for promoting efficiency in seed attachment and intermediate rearing of Patinopecter yessoensis
JP3684442B2 (en) Red scallop seedling harvesting device, red scallop seedling production method, red scallop culture culm and scallop culture method
CN206402939U (en) A kind of cultchless oyster breeding cage
KR101806086B1 (en) Cultivating method for abalone farming
KR101523463B1 (en) Method for hanging mesh type oyster culture
CN107926774B (en) Hexagrammos otakii wild parent fish pond net cage cultivation method
CN109362610B (en) Method for cultivating fry of sepia reiliana
KR101806085B1 (en) Sea cucumber cultivator
KR101634351B1 (en) Detachable spat collector
JP2798382B2 (en) Seaweed vegetation sheet for shellfish culture
KR20120000927U (en) One process system of sea squirt culture
CN105613352B (en) A kind of apparatus and method that the artificial incubation of swamp eel fertilized eggs is educated with eel kind without earth culture
KR101286706B1 (en) Preparation method of sea squirt
JP2020178616A (en) Culture method of short-neck clam
CN110036948B (en) Method for batch propagation of porgy
KR101848586B1 (en) Oyster grafting and cultivation method with oyster shell function using FRP

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20050419

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20050426

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20050511

R150 Certificate of patent or registration of utility model

Ref document number: 3684442

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110610

Year of fee payment: 6

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140610

Year of fee payment: 9

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250