JPH10155387A - Marine plant vegetation sheet for shellfish culture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a marine plant vegetation sheet for shellfish culture for providing the shellfish culture basket of scallops or the like capable of preventing the mass decease of cultured shellfish. SOLUTION: Marine plants 2 or the seeds or spores are vegetated on this sheet 3 housable or attachable to the inside or outside of the shellfish culture basket 1 for culturing the shellfish by housing the shellfish such as the scallops or the like whose feed is not the marine plants and being hung in the sea. The sheet 3 for vegetating the marine plants 2 or the seeds or the spores is provided with water permeability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to shellfish cultivation used for cultivating scallops, pearl oyster shellfish, oysters and other oysters that do not feed on seaweed, suspending them in the sea, and culturing them. The present invention relates to a seaweed vegetation sheet for shellfish cultivation used by being attached to a basket.

[0002]

2. Description of the Related Art When cultivating shellfish that do not feed on seaweed such as scallops, pearl oysters for pearl cultivation, or oysters, they are currently suspended in nets in fishnet cages. . There are various types of aquaculture baskets, such as square baskets, round baskets, so-called pockets, and so-called windsocks. There are various sizes of fish cage cages,
For example, 1.5 min, 2 min, 3 min, 4 min for scallop culture
There are various things such as minute, 7 minute, 1 inch, etc.

[0003] Scallops take two to three years from the start of aquaculture to the size that can be sold. During that time, the scallop continues to grow. Has been replaced with a culture basket. At the time of this replacement, the number of scallops to be placed in the culture basket was reduced by the size of the scallops. Also, if foreign matter adheres to the cultivation cage during cultivation in the sea, the tide will deteriorate, so at this time the cultivation cage is replaced with a new one. The period of use (the period until replacement) of the culture basket is about 1 to 10 months, and the smaller the shellfish to be cultured, the shorter the period because the growth is remarkable. The replacement work of the above-mentioned culture baskets has been increasing since around July,
This replacement is done three or more times before the shellfish can be sold.

[0004]

As mentioned above, the cultivation period is 2 to 3 years before the scallop becomes large enough to sell.
It takes years, so you have to spend several high summer temperatures in the meantime. However, oxygen deficiency occurs at that time, causing massive death of juvenile shellfish and massive death (over 90%) due to oxygen deficiency in other organisms.

It is considered that the cause of the mass death of the larvae is the bait of the scallop, and the water becomes oxygen-deficient due to the remarkable decrease of the phytoplankton which is considered to be the largest source of oxygen. Such a situation is considered to be mainly caused by the following. . The number of shellfish being cultivated exceeds the permissible range of the volume in the bay to be cultivated. . Seawater is dirty due to inflow of domestic wastewater into the bay. . Soil flowing into the bay at the same time as rain due to the overcutting of trees in the mountains, making the bay shallow, dirty, or the plants in the bay withering. . Seagrass in the bay is decreasing. . Because the farm is fixed, dust and other debris accumulate on the sea floor of the farm and have become rotted.

[0006] The problem of the mass death of juvenile shellfish as described above is that every fisherman and local residents must be careful and consider a solution, but such signs are not seen at all.
This is almost all the farms in Japan and the sea is getting thinner. For this reason, similar accidents are repeated every summer in the summer, which has become a major concern for fishermen, and a solution to this problem has been awaited.

An object of the present invention is to provide a seaweed vegetation sheet for shellfish cultivation for providing a shellfish cultivation basket such as a scallop capable of solving the above-mentioned problem of oxygen deficiency during shellfish cultivation and preventing mass death of the cultured shellfish. Things.

[0008]

The first seaweed vegetation sheet for cultivating shellfish according to the present invention has a storage portion capable of storing shellfish therein, the periphery of which is closed by a material having water permeability.
A shell-out opening is formed in the storage part, and shells such as scallops that do not feed on seaweed are stored in the storage part and suspended in the sea, so that the shells in the storage part can be cultivated. Seaweed or its seeds or spores are vegetated on a sheet that can be stored in the storage section.

The second seaweed vegetation sheet for shellfish cultivation of the present invention has a storage portion capable of storing shellfish therein by being closed around by a water-permeable material, and a shellfish inlet / outlet formed in the storage portion. By storing shells such as scallops that do not feed on seaweed in the storage section and suspending them in the sea, the seagrass can be attached to a sheet that can be attached to the inside or outside of a shellfish culture basket that enables the shellfish to be cultured in the storage section. Alternatively, the seeds or spores are vegetated.

[0010] The third seaweed vegetation sheet for shellfish cultivation of the present invention has a water-permeability sheet vegetated with seaweed or its seeds or spores.

[0011]

Embodiment 1 A first embodiment of a seaweed vegetation sheet for shellfish culture according to the present invention will be described with reference to FIG. The structure of the shellfish culture cage 1 in FIG. 1 is the same as that of the conventional one, and four net-like side surfaces 7 are provided in the shape of a quadrangular pyramid from the net-like bottom surface 5 to the top portion 6, one of which is a ridgeline. The shells 9 such as scallops which do not feed on seaweed can be put in and out of the storage portion 24 by inserting a hand through the shells opening 8 formed above. A hanging string 10 extends from the center of the bottom surface 5 to the top portion 6, and another rectangular shell culture basket 1 can be connected to a lower portion of the hanging string 10.

The seaweed vegetation sheet for shellfish cultivation of this embodiment has a seaweed 2 vegetated on a sheet 3 large enough to be laid on the bottom surface 5 of the shellfish cultivation basket 1 of FIG. A cut 11 and a through hole 12 for passing the cord 10 are formed in the sheet 3, and the cut 11 is opened on a side surface of the sheet 3 to facilitate introduction of the cord 10. The string 1 introduced from the cut 11 by communicating with the through hole 12
0 is drawn into the through hole 12. The sheet 3 is placed inside the shellfish culture basket 1 through the shellfish inlet / outlet 8.

For growing the seaweed 2 on the sheet 3, for example, the following is performed. As the sheet 3, a mesh material having the same mesh size as the mesh of the shellfish culture basket 1 is used, and the mesh material is put in an aquarium containing seawater and seaweed. And spores grow in the aquarium. The reason why the net material is used as the sheet 3 is to make the roots of seaweed easy to spread and to improve the tide.

When the seagrass 2 grows on the sheet 3 as described above, the sheet 3 is placed on the shell culture basket 1 as shown in FIG.
Is cut into a rectangular shape slightly smaller than the bottom surface 5, and a notch 11 and a through hole 12 are formed, and the cutout 11 is put into the shellfish culture basket 1.
Alternatively, the sheet 3 is previously formed into a rectangular shape as shown in FIG. 1 (b), and the cuts 11 and the through holes 12 are formed, and the sheet 3 is placed in the above-mentioned water tank to attach seeds and spores.
It can also be made to grow on seaweed 2.

As the seagrass 2, it is desirable to use edible seaweeds such as fukuro nori, matsumo, sasabinori, etc., which do not hinder the growth even when slightly illuminated on the sun, but are useful for oxygen supplementation. In addition, any other material that does not generate harmful substances can be used. In the case of any kind of seaweed, if a seaweed of a kind that cannot produce seeds and spores is used, the seaweed 2 will not grow in the shellfish culture cage 1, the tide will be better, and the effect of preventing oxygen deficiency will be improved. Further improve.

[0016]

Embodiment 2 A second embodiment of the seaweed vegetation sheet for shellfish culture of the present invention will be described with reference to FIG. FIG. 2 (a)
The sheet 3 shown in FIG. 3 is an elongated sheet. After growing the seaweed 2, the sheet 3 is rolled, loaded on a ship, and carried to the ocean.
It is cut on a ship to a desired length so that it can be used. In the case of this elongated sheet 3, two pieces each having a magic tape 13 attached to the back surface are joined, and when attaching to the shellfish cultivation basket 1, it is cut to a desired length and then one of the magic tapes 13 is peeled off. Then, as shown in FIG. 2B, the two magic tapes are attached to each other so as to face the bottom of the shellfish culture basket 1 and the outside and inside of the outer peripheral net 14.

In the case of this elongate sheet 3, the magic tape 13 is attached to the back surface, so when seaweed spores are attached to the surface of the sheet 3 and are grown, the magic on the back surface of the two sheets 3 is used. It is desirable that the tapes are adhered to each other.
No dust, seeds, spores, etc. adhere to 3
3, the adhesion is not impaired.

The shellfish breeding basket 1 on which the seaweed vegetation sheet for shellfish cultivation of the present invention is to be mounted is not limited to a square basket, but may be a basket having another form or shape. As one of them, the one shown in FIG. 3 is a conventional round type. In this case, a plurality of circular nets 15 are connected to each other at predetermined intervals in the vertical direction by extending an outer peripheral net 14 outside a circular net 15 serving as a bottom surface. The shell 24 is formed with a shells inlet / outlet 16 through which shells can be taken in and out.

The shellfish cultivation basket 1 shown in FIG. 4 is of a pocket type, and a small net 18 is attached to the surface of a single net base 17 to form a storage section 19 having an open upper end.
The shells 9 can be put in and out of the shells through the shell opening 20. In the case of this pocket type shellfish culture basket 1, a sheet 3 with a magic band on which seaweed 2 grows
Is attached to, for example, a net base material 17 to vegetate the seaweed 2.

The shellfish culture basket 1 may be as shown in FIG. This shellfish culture basket 1 is of a windsock type, in which a net base material 22 is stretched on a rectangular frame material 21 formed by bending a wire, and a small piece net 23 is attached to the surface of the net base material 22 so that the upper end is opened. A portion 24 is formed so that shells can be put in and taken out of the storage portion 24 through a shellfish inlet / outlet 25. In the case of this pocket-type shellfish culture basket 1, the seaweed 2 is vegetated by attaching a sheet 3 with a magic band on which seaweed grows to, for example, a net base material 22.

[0021]

The first seaweed vegetation sheet for shellfish culture of the present invention has the following effects. That is, when the shellfish culture basket 1 is stored in the shellfish culture basket 1 together with shellfish such as scallops that do not feed on seagrass, and the shellfish culture basket 1 is suspended in the sea, the shellfish from the seagrass 2 in the sea during the culture of the shellfish or the seagrass. Oxygen is generated from seaweed grown from seeds or spores and oxygen is supplied to the shellfish cultivation cage, oxygen deficiency in the shellfish cultivation cage 1 can be prevented, and massive death due to lack of oxygen in the shellfish cultivation cages. Can be prevented. In addition, plankton, which serves as a bait for shellfish such as scallops, and also serves as a source of oxygen, can easily grow inside and outside the shellfish cage 1, and an environment suitable for shellfish culture can be obtained.

The second seaweed vegetation sheet for shellfish culture of the present invention has the following effects. That is, the seaweed vegetation sheet can be easily attached not only to the inside of the shellfish culture cage 1 but also to the outside or both inside and outside.

The third seaweed vegetation sheet for cultivating shellfish of the present invention has the following effects. That is, the seaweed or its seeds or spores vegetated sheet has water permeability, so even if the seaweed vegetation sheet is attached to a shellfish cultivation cage, the flow of tide is less likely to be inhibited, and the roots of seaweed are more easily stretched, furthermore, ,
Shells such as scallops that do not feed on seaweed stored in the storage unit can be easily captured, and are particularly suitable for cultivation of shellfish such as scallops that do not feed on seagrass.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a state in which a seaweed vegetation sheet of the present invention is accommodated in a shellfish culture basket, and FIG. 1B is a perspective view showing an example of a seaweed vegetation sheet of the present invention.

FIG. 2A is a perspective view showing an example of a seaweed vegetation sheet of the present invention with a magic tape, and FIG. 2B is an explanatory view showing a state in which the seaweed vegetation sheet of FIG.

FIG. 3 is a perspective view showing another example of a shellfish culture basket using the seaweed vegetation sheet of the present invention.

FIG. 4 (a) is a front view of a pocket-type shellfish culture basket using the seaweed vegetation sheet of the present invention, and FIG. 4 (b) is a schematic side view of the shellfish culture basket.

FIG. 5 (a) is a front view of a streamer-type shellfish culture basket using the seaweed vegetation sheet of the present invention, and FIG. 5 (b) is a schematic side view of the shellfish culture basket.

[Explanation of symbols]

 1 Shellfish culture basket 2 Seaweed 3 Sheet

Claims (3)

[Claims] 1. A scallop that does not feed on seaweed in a storage part capable of storing shellfish therein, the shell of which is closed by a material having water permeability, the storage part capable of storing shellfish therein is formed in the storage part. Sea shells or their seeds or spores are stored on a sheet that can be stored in the storage section of a shell cultivation basket in which the shells in the storage section can be cultivated by storing and hanging the sea shells in the sea. Characteristic seagrass vegetation sheet for shellfish culture. 2. A scallop that does not feed on seagrass in the storage part, the periphery of which is closed by a material having water permeability, a storage part capable of storing shellfish is formed therein, and a shellfish entrance is formed in the storage part. Seaweed or its seeds or spores are stored on a sheet that can be attached to the inside or outside of a shellfish cultivation basket that allows the shellfish to be cultivated in the storage unit by storing shellfish such as Characteristic seagrass vegetation sheet for shellfish culture. 3. The seaweed vegetation sheet for shellfish cultivation according to claim 1, wherein the sheet on which the seaweed or its seeds or spores are vegetated has water permeability.