JP2012239400A - Method and assembly for cultivating bivalve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembly for efficiently cultivating short-necked clams, with a short-necked clam-containing apparatus set on a dry beach.SOLUTION: The assembly for efficiently cultivating bivalves is so designed that: short-necked clam containers 5 each having a water passage via which seawater goes thereinto are formed and projectedly set at intervals on a dry beach; there is provided a cylindrical form 1 projectedly supporting the short-necked clam containers 5, each of the containers 5 is formed at a compartment of the cylindrical part of the cylindrical form 1, whose cylindrical continuous space is provided with partitions, a meshy net 3 is laid at each of the partitions, with the meshes impassable for short-necked clams; and short-necked clams are contained in spaces enclosed by the cylindrical form 1 and the partitions.

Description

  The present invention relates to a bivalve culture method and apparatus, and more particularly, to a bivalve culture method and apparatus that realizes efficient clam culture and recovery of clam resources by installing a device containing clams on a tidal flat.

In recent years, clam resources have been decreasing significantly along the coast of Japan, and various efforts have been made to investigate the cause and restore resources at research institutions in the country and prefectures.
When bivalves such as clams were released into the tidal flat, there were problems that juveniles were washed away by waves and supplemented by natural enemies.
In addition, in order to prevent the influence of waves and the invasion of natural enemies, a method of installing piles on tidal flats to fix and raise clams has been adopted, but it is not effective enough.
Under such circumstances, the technique of Patent Document 1 has been proposed as a technique relating to a bivalve culture method.
JP 2008-92949 A

The technique of Patent Document 1 is a technique for cultivating clams in an aquaculture device on land. However, there is an annoyance that feed for clams has to be supplied regularly, especially for recovery of clam resources in natural sea areas. There was a problem that it was not a technology that could be realized.
The present invention has been made to solve the conventional problems, and the purpose of the present invention is to install a device containing clams on a tidal flat, thereby enabling efficient cultivation of clams and the utilization of clam resources. It is an object of the present invention to provide a bivalve culture method and apparatus that realizes recovery.

  In the bivalve culturing method according to claim 1, as a means for achieving the above object, a container having a water passage portion into which seawater enters is formed, and a large number of the containers are arranged in a contact area with seawater. A method for cultivating bivalves in the container was adopted.

  The bivalve culturing method according to claim 2 is characterized in that, in the bivalve culturing method according to claim 1, the container is projected on the tidal flat at an interval.

  4. The clam culture apparatus according to claim 3, wherein the clam culture apparatus is used in the bivalve culture method according to claim 1 or 2, wherein the clam container includes a water passage portion into which seawater enters, and the clam housing. It is provided with a pillar part that supports the body in a state of projecting on a tidal flat.

  The bivalve aquaculture device according to claim 4, wherein in the bivalve aquaculture device according to claim 3, the column portion is cylindrical, and a container is formed in a portion of the cylindrical portion. A partition is formed in the continuous space, a mesh mesh that does not allow clams to pass through the partition, and the claws are accommodated in a space surrounded by the cylinder and the partition.

  6. The bivalve aquaculture device according to claim 5, wherein the columnar body is either self-supported by embedding the lower part in a tidal flat, or fixed to a column placed on the tidal flat. Characterized by being mounted by.

By adopting the above configuration, the present invention has the following effects.
In the bivalve culture method according to claim 1, a method of forming a container having a water passage portion into which seawater enters, arranging a large number of the containers in a contact area with seawater, and cultivating a bivalve in the container; As a result, clams can be cultivated easily and efficiently simply by leaving the clam container in the natural sea area.
Also, install the device in contact area with seawater such as tidal flats, and introduce and deposit natural clams into the device together with seawater entering from the water flow section, so that it functions as a “clam depositing device”. Is also possible.
In particular, compared with a conventional artificial seedling production facility, it is possible to cultivate by simply leaving it on the sea, so that labor, time and cost can be reduced.

In the bivalve culture method according to claim 2, since the container is installed on the tidal flat, recovery of clam resources can be achieved in an environment suitable for clam habitat.
In addition, since the container projects on the tidal flat at intervals, it can prevent clams from being washed away and invading natural enemies.
In addition, when the cultivation method of the present invention is carried out together with the cultivation of nori, the nutrients for the cultured nori are secured in order for the clams to ingest plankton that absorbs nutrients such as chisso and phosphorus that are nourished for the nori. Prevent discoloration of seaweed.

  In the bivalve aquaculture device according to claim 3, since the clam container provided with a water passage portion into which seawater enters, and a pillar portion that supports the clam container in a state of projecting on the tidal flat, It can be easily installed in the natural habitat of conventional clams.

  In the bivalve aquaculture device according to claim 4, a partition is formed in a cylindrical continuous space, a mesh mesh of meshes through which no clam passes is disposed, and the clam is accommodated in a space surrounded by the cylinder and the partition. Since it is configured, seawater water passage is secured by the mesh net, and a clam culture space suitable for clam habits is formed with a simple structure.

  In the bivalve culture device according to claim 5, the column part is attached by either fixing the main body by itself by embedding the lower part in the tidal flat, or by fixing to the column placed on the tidal flat. It can be installed reliably.

  Hereinafter, the best mode for realizing the bivalve culture method and facility of the present invention will be described.

As shown in FIG. 1, the bivalve aquaculture apparatus A according to the first embodiment includes a tubular body 1 made of a resin material, a mesh net 2 disposed inside the tubular body 1, and a tubular body 1. The main part is a lid 3 disposed at the front end of the tube and a reinforcing portion 4 fitted outside the cylindrical body 1.
The lower part of the cylindrical body 1 is extended so that the entire apparatus is columnar (columnar).
A portion surrounded by the cylindrical body 1, the mesh net 2 and the lid 3 is a clad container 5, and the mesh net 2 and the lid 3 function as a seawater passage.
In addition, although not shown in figure, the water flow part of seawater is also formed in the side surface of the cylindrical body 1 as needed.

The shape and size of the cylindrical body 1 are appropriately set according to the installation sea area, the type of clam, and the like, but as an example, a form having a thickness of several mm, a diameter of several centimeters to several tens of centimeters, and a length of several tens of centimeters to 200 cm Is used.
Although the cylindrical body 1 is formed of a vinyl chloride resin, any material can be used as long as the material is a resin material having a fixed form, such as a polyethylene resin, a phenol resin, and an aramid resin. It can also be formed of a corrosion resistant metal.

The mesh net 2 is divided into upper and lower parts in a state where the internal space of the cylindrical body 1 is cut into a circle, and forms the bottom of each container 5.
The mesh net 2 is set to a mesh through which clams in the container do not pass. Use a fine mesh net to accommodate juveniles and juveniles, and use a large mesh to accommodate adult shells. Applicable.
In this embodiment, the mesh net 2 is made of a resin material, but it can also be formed of a corrosion-resistant metal like the cylindrical body 1.

The lid 3 of the cylindrical body 1 is formed by covering the inlet of the cylinder with a mesh net and binding the mesh net spread outside the cylinder around the outer circumference of the cylinder. The lid 3 allows seawater to pass through the opening at the upper end of the cylinder. Can secure water and prevent clam spills.
The lid 3 may be a closed body that prevents passage of seawater and clams, and may be supplied with seawater from a water passage formed on the side surface of the mesh net 2 or the cylindrical body 1.
The reinforcing portion 4 is a cylindrical body fitted on the outer periphery of the cylindrical body, and protects and reinforces the cut portion of the cylindrical body provided with the mesh net 2 from the outside.
The lid 3 and the mesh net 2 are portions that function as a water flow portion, but minute holes that function as a water flow portion (not shown) are also formed on the side surface of the cylindrical body 1 as appropriate.

Next, a method for cultivating clams using the culture apparatus A of the present invention will be described.
As shown in FIG. 2, the aquaculture apparatus A of the present invention accommodates clams in a container 5 surrounded by a cylindrical portion and a mesh net 2, and is installed on a tidal flat at a predetermined interval.
In addition to adult clams, clams accommodate cultured larvae, juveniles, etc., and if necessary, accommodate the same growth stage in the same container 5.
The container 5 is surrounded by a cylindrical body 1 around the side, and a mesh net is disposed on the bottom and top surfaces. Therefore, when seawater fills, the mesh net 2, the lid 3, and a cylindrical body (not shown) can pass therethrough. Seawater enters from the water section and is supplied to the clams (larvae, juveniles, adults) inside.
When the seawater is drawn, the seawater is drained from the mesh net 2 or the water passage and the clams are dried.

  The tidal flat is an intertidal zone between the high tide and the low tide where a low marsh formed by sand and mud that develops on the coast is maintained over a certain area. It is a terrain that repeats land and sea level over time. In general, compared to sandy beaches, there is less influence of waves, the slope is gentle, the sediment particle size is small, and the biota is flat and diverse.

The bivalve aquaculture apparatus A of the present invention has a protruding height from the tidal flat of about 100 cm, and a large number of the protruding column portions are spaced apart from each other by several tens to 100 cm in the horizontal direction.
By having such an installation state, invasion of supplementary organisms such as rays can be prevented, and the outflow of clams due to the influence of waves can be prevented.
When the apparatus A is installed, the head of the cylindrical body 1 is hit with a hammer and the lower part of the pillar is pierced into the tidal flat and fixed on the tidal flat. Alternatively, a separate support column is inserted into the tidal flat, and the device body is fixed to the support column by binding or the like.
Device A is installed in a place where clams in the containment body are at least temporarily exposed (dried) to the sea surface due to seawater filling, but even if the clams are always in the sea, can get.

In the bivalve cultivation method of the present invention, clams in the container 1 grow by ingesting phytoplankton of seawater supplied from a water passage.
Since clams do not pass through the water flow section and can prevent the invasion of supplementary organisms, clams can be stably cultivated.
Clams are cultivated in the container 1 for a single year or for a plurality of years depending on the stage of growth.
By installing the apparatus of the present invention, clams seeds and seedlings are released into the tidal flats around the apparatus, so that the resources of the clams can be recovered.

In the present embodiment, the clad 5 such as adult shellfish, juvenile shellfish and juvenile shellfish are accommodated in the container 5 for culturing. However, the apparatus is not brought into contact with seawater such as tidal flats without accommodating clams. It is also possible to install and deposit natural clams in the device together with seawater entering from the water flow section.
In this case, floating seedlings in seawater adhere to the mesh net of the container and grow in the apparatus without flowing out, so to speak, function as a “deposition apparatus”.

[Test example]
Examples of aquaculture tests using the device A of the present invention are as follows.
A clam-deposited early larvae (shell length of about 1 mm), larvae (10-20 mm), and parent shells (shell length of 30 mm or more) are housed in a container consisting of a PVC pipe using Müller gauze as a mesh net. It was installed in Yoshitoro Tidal Flat and aquaculture tests were conducted for about 50 days from July to early September 2010.
During the test period, the concentration of seawater decreased due to heavy rain, and the water temperature on the tidal flat could reach a high temperature exceeding 30 ° C due to good weather. In addition, even in the early stage larvae, a survival rate of nearly 100% was observed depending on the container.

Next, a bivalve culture device according to the second embodiment will be described with reference to FIG.
In the bivalve aquaculture apparatus according to the second embodiment, the partition (bottom) of the mesh net 2 is arranged in a state in which the internal space of the cylindrical body 1 is cut into multiple stages, and each of the spaces separated by the mesh net 2 is placed in each space. It is the structure which accommodates a clam.
In this embodiment, no reinforcing portion is disposed outside the mesh net 2, but it is firmly attached to the inside of the cylindrical body via an adhesive or a fixture.
By adopting this apparatus A, the clad container 5 is formed in multiple stages inside one column part, and the aquaculture is performed efficiently.
The usage method, installation method, and the like are the same as in the first embodiment.

Although the embodiments have been described above, the specific configuration of the present invention is not limited to the above-described embodiments, and design changes and the like within a scope not departing from the gist of the invention are included in the present invention.
For example, in the above-described embodiment, the mesh net 2 is disposed at the bottom of the container 1. However, instead of the mesh net, a seawater storage portion is formed at the bottom of the container, and the seam is drawn even after the seawater is drawn. It is also possible to adopt a configuration in which seawater is temporarily stored, and after the seawater is drawn, the water gradually disappears due to evaporation or the like.
Although the said Example demonstrated the method of culture | cultivating clams, it is contained in this invention even when it is a case where it applies to bivalves other than clams.

It is explanatory drawing of the culture apparatus of the bivalve which concerns on 1st Example. It is explanatory drawing of the culture method of a bivalve. It is explanatory drawing of the culture apparatus of the bivalve which concerns on 2nd Example.

DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 Mesh net | network 3 Lid 4 Reinforcement part 5 Container

Claims (5)

  A bivalve culturing method in which a container having a water passage portion into which seawater enters is formed, a large number of the containers are arranged in a contact area with seawater, and a bivalve is grown in the container.   The method for cultivating a bivalve according to claim 1, wherein the container projects on a tidal flat at an interval. An apparatus used in the bivalve culture method according to claim 1 or 2,
A clam culture device comprising: a clam container having a water passage portion into which seawater enters, and a pillar portion that supports the clam container in a state of protruding from a tidal flat. The column part has a cylindrical shape, and a container is formed in one stroke of the cylindrical part,
4. A clam culture according to claim 3, wherein a partition is formed in a cylindrical continuous space, a mesh mesh that does not allow clams to pass is disposed in the partition, and the clams are accommodated in a space surrounded by the cylinder and the partition. apparatus.   5. The clam culture apparatus according to claim 4, wherein the column part is attached by either fixing the main body independently by embedding the lower part in a tidal flat, or by attaching and fixing it to a column placed on the tidal flat.

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