JP3211128B2 - Seafood growing container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for growing fish and shellfish for growing aquaculture larvae, juvenile shellfish and the like to a predetermined size.

[0002]

2. Description of the Related Art For example, when salmon or the like is released, if a fry immediately after hatching is released into a river as it is, most of it is predated by other fish or starved. For this reason, fry is confined within a certain area, fed until it reaches a certain size, and then released. As a facility for trapping fry in a certain area (hereinafter referred to as a “fish and shellfish growing container”), a fish cage in which a part of the water surface is partitioned by a net or a basket is generally used.

[0003]

However, the conventional fish cage has the following problems.

[0004] During raising, it takes time and effort to feed. Feeding is done several times a day. On the other hand, it takes months or even years for fry to reach a certain size, so the number of feedings required is enormous.

[0005] Places where fish cages are installed are limited to river banks or near seas near the fisherman's residence because of the need to reduce the labor required for feeding. Therefore, complicated work may be required for the release. That is, there is a case where the fry is once transferred from the fish cage to another transport container, and the fry is taken out from the transport container and released into a river or a distant sea. In addition, the water quality is not very good on the river banks and near the sea.

After the release, it takes time to collect the fish cage.

[0007] These are issues that need to be resolved immediately in order to promote the aquaculture fishery.

[0008]

Therefore, an object of the present invention is to feed fry,
It is an object of the present invention to provide a fish and shellfish growing container that can achieve labor saving in the release and collection of the fish and shellfish growing container, and can expand the range of the installation place.

[0009]

SUMMARY OF THE INVENTION A container for growing fish and shellfish according to the present invention has been made in order to achieve the above object, and has an outer member made of a material containing a degradable resin and bait of fry. With a small hole that is provided through the front and back of the surrounding member and has a size that can contain the fry,
When the fry becomes a certain size, the fry is disassembled so that the fry can come out of the surrounding member.

[0010] Here, the term "degradable resin" refers to a resin that decomposes and disappears in the natural environment.
It refers to a resin that exhibits water solubility and the like. As biodegradable resin,
Natural polymer based on chitosan, cellulose, etc., microbial polyester based on microbial polyhydroxybutyrate, etc., blends of general-purpose plastics with starch and additives promoting decomposition, synthetic chemistry using synthetic polymers System, etc. As a water-soluble resin,
For example, there is polyvinyl alcohol.

[0011] The outer member may be made of a plurality of materials having different degradability or different bait amounts.

[0012]

The fish and shellfish growing container according to the present invention is installed in water, for example, in the sea or a river, and fry is grown therein. Since the seafood growing container is provided with a small hole, fresh water such as the sea or a river enters the seafood growing container through the small hole.
However, the stoma is so small that the fry cannot escape through the stoma. Naturally, predatory fish larger than fry cannot enter the seafood breeding vessel through the stoma. This protects the fry from external enemies.

On the other hand, as the degradable resin is decomposed, the bait contained in the surrounding member is exposed. Fry grows on this bait.

When the fry reaches a certain size, the decomposable resin is decomposed, so that the fry can go out of the seafood growing container by itself. At this time, the fry has already grown to a sufficient size and cannot be eaten by predatory fish, and continues to grow steadily.

Further, since the surrounding member is made of a decomposable resin, even if it is left in water after installation, it disappears without polluting the environment.

[0016]

1 shows a first embodiment of a fish and shellfish growing container according to the present invention. FIG. 1 (A) is a partially cutaway side view, and FIG. 1 (B) is FIG. 1 (A). It is a principal part expanded sectional view of the surrounding member in FIG. Hereinafter, description will be made based on these drawings.

The fish and shellfish growing container 10 according to the present invention is provided with an outer member 16 made of a material containing a degradable resin 12 and a bait 14 of a fry f, and provided through the outer and inner surfaces of the outer member 16 and a fry f. Hole 1 having a size capable of confining a hole
8 is decomposed so that the fry f can come out of the surrounding member 16 when the fry f reaches a certain size.

The surrounding member 16 is a "cage-like body" having a number of small holes 18 penetrating the front and back. Outer surrounding member 16
As an example of the manufacturing method of the above, a case of manufacturing by a compression molding method is described. First, a female mold and a male mold prepared so that the surrounding member 16 can be taken out as a molded product are prepared. And 50% by weight of polyvinyl acetate and 50% by weight of cellulose
To make this into a powdery degradable material. Since both polyvinyl acetate and cellulose are biodegradable resins, this degradable material is 100% biodegradable resin. Subsequently, this degradable material is put into a female mold, and bait 14 is mixed if necessary, and the male mold is pressurized at 10 to 100 kg / cm ² and heated to 32 to 60 ° C. Thus, the surrounding member 16 made of the degradable resin is manufactured.

Next, a rectangular parallelepiped fish and shellfish growing container 10 is assembled from the plurality of outer surrounding members 16 cut into a desired size. A frame 20 and a float 22 are provided at the upper end of the fish and shellfish growing container 10. Then, the fish and shellfish growing container 10 is
Install it in a state of floating on 4.

Further, the surrounding member 16 in this embodiment is
Two kinds of raw materials having different degradability or food amount are laminated. That is, the first material is 100% biodegradable resin 12
a), the second material is 100% biodegradable resin 1
2b and the bait 14 mixed therein. Biodegradable resin 12
Preferably, a is a (polyhydroxybutyrate / hydroxyvariate) copolymer shown in FIG. 4 (A), for example, in which biodegradation proceeds rapidly at a certain time. The biodegradable resin 12b is gradually degraded, for example, as shown in FIG.
Polylactide shown in (B) is preferred. By this, when the fry f becomes a certain size, the biodegradable resin 12a is rapidly decomposed and the surrounding member 16 is collapsed, so that the fry f is taken out of the surrounding member 16. Become.

The bait 14 is preferably a pelletized blended feed, for example, an expanded pellet (EP). When the expanded pellets are exposed to the water 24 due to the decomposition of the biodegradable resin 12b, the expanded pellets absorb water and expand to make the fry f easy to eat, and have excellent shape retention in the water 24. Further, it is preferable that the bait 14 is mixed into the biodegradable resin 12b so that the bait 14 increases as the biodegradation proceeds, that is, as the fry f grows. This is because the feeding amount of the fry f increases as the fry f grows. Furthermore, the reason why the bait 14 is not mixed into the biodegradable resin 12a is as follows.
This is because the bait 14 is effectively used. That is, even if the bait 14 is mixed into the biodegradable resin 12a,
This is because a is located outside the fish and shellfish growing container 10 and can only be eaten by the fish C outside the fish and shellfish growing container 10 and does not contribute to the growth of the fry f.

FIG. 2 is a cross-sectional view of a main part showing temporal changes of the surrounding member 16 and the fry f, and shows that time elapses in the order of FIGS. Hereinafter, FIGS. 1 and 2
The operation of the fish and shellfish growing container 10 will be described on the basis of FIG.

First, the fish and shellfish growing container 10 is placed in the water 24 and the fry f is released into the fish and shellfish growing container 10. At this time, the flow of water in the fish and shellfish growing container 10 is reduced by the small holes 18.
By passing through, it is always replaced with fresh water. Further, since the small hole 18 is small, the fry f cannot go out of the seafood breeding container 10, and the fish C larger than the fry f cannot enter the seafood breeding container 10. Therefore, the fry f is protected from foreign enemies in fresh water (FIG. 1).

Then, as time elapses, the surfaces 12c and 12d of the biodegradable resins 12a and 12b are gradually decomposed by microorganisms in the water, so that the surrounding member 16 becomes thinner. At this time, the bait 14 mixed in the biodegradable resin 12b is exposed one after another and eaten by the fry f. In this way, feeding is automatically performed from the surrounding member 16, and the fry f grows smoothly (FIGS. 2A to 2C).

As the time elapses further, the biodegradation of the enclosing member 16 progresses, so that the enclosing member 16 becomes thinner and thinner, and it becomes difficult to maintain its shape gradually. Collapses. Then, the fry f goes out of the outer surrounding member 16 from the collapsed portion (FIG. 2 (2)). That is, the fry f is automatically released. The fry f that has gone outside has already grown to a sufficient size and cannot be eaten by other fish C and continues to grow more smoothly.

After a while, the fish and shellfish growing container 10
Disappears completely without polluting the environment. That is, the fish and shellfish growing container 10 does not need to be collected and can be left as it is.

FIG. 3 is a graph showing the growth process of each type of fry f. FIG. 4 is a graph showing the relationship between the number of days and the rate of change in weight for each type of degradable resin. Hereinafter, a design method of the fish and shellfish growing container 10 will be described with reference to FIGS.

First, the type of the fry f is determined. As illustrated in FIG. 3, the growth and release timing of the fry f vary depending on the type of the fry f.

Subsequently, the type and structure of the decomposable resin 12 are determined. At this time, the fry f
It is necessary to provide a property of decomposing so as to be able to get out of the device. That is, based on the characteristics of the decomposable resin illustrated in FIG. 4, the disintegration time of the surrounding member 16 coincides with the desired discharge time by variously selecting the type, the composition, and the laminated structure of the decomposable resin. Can be done. Generally, in order to make the discharge timing accurate, it is preferable to design so that decomposition proceeds rapidly before and after the discharge timing. For example, the surrounding member 16 is manufactured from a biodegradable material having a two-layer structure in which a biodegradable resin having a high biodegradability is used as a core and a biodegradable resin having a low biodegradability is coated around the core. Then, when the biodegradable resin with slow biodegradation decomposes and disappears, the biodegradable resin with fast biodegradation is exposed, and the property that biodegradation proceeds rapidly is obtained.

Further, the property that the fry f is decomposed so that the fry f can come out of the surrounding member 16 at the time of release is not limited to collapse due to decomposition. For example, it can be realized by disassembling the fry f to a size that allows the fry f to pass through when the fry f reaches a certain size. FIG. 5 is a graph showing the change over time in the size of the small hole 18 and the fry f. Hereinafter, description will be made with reference to FIGS.

In FIG. 5, a broken line 181 indicates the size of the small hole 18, and a solid line f1 indicates the size of the fry f.
The initial size (diameter) of the small hole 18 is set to 2 mm or more in order to make water enter and exit well. And after installation 40
It is designed to biodegrade to a size that allows the grown fry f to pass through in ~ 60 days. The dashed line 181 can be formed into various desired curves by variously selecting the type, the composition, the laminated structure, and the like of the biodegradable resin. The relationship between the number of days and the size of the small hole 18 can be understood from the characteristics of the biodegradable resin shown in FIG. For example, if the surrounding member 16 is made of a biodegradable material having a two-layer structure in which a biodegradable resin having fast biodegradation is used as a core and a biodegradable resin having slow biodegradation is coated around the core, a dashed line 182 is obtained. That is, the one-dot chain line 182 indicates that when the biodegradable resin with slow biodegradation decomposes and disappears, the biodegradable resin with fast biodegradation is exposed and biodegradation proceeds rapidly.

FIG. 6 is a side view of a main part of a second embodiment of the fish and shellfish growing container according to the present invention. However, illustration of the same parts as in the first embodiment is omitted. Hereinafter, description will be made based on this drawing.

The surrounding member is not limited to a cage-like body.
It may be a net or a plate. FIG. 6 is an example in which the surrounding member is a mesh. The outer surrounding member 30 is made of two kinds of rope-shaped materials having different degradability or different bait amounts. That is, the first material is 100% biodegradable resin 32
a only, 100% biodegradable resin 3
2b and the bait 14 mixed therein. Biodegradable resin 32
Preferably, a is a (polyhydroxybutyrate / hydroxyvariate) copolymer shown in FIG. 4 (A), for example, in which biodegradation proceeds rapidly at a certain time. The biodegradable resin 32b gradually undergoes biodegradation.
Polylactide shown in (B) is preferred. By this, when the fry f becomes a certain size, the biodegradable resin 32a is rapidly decomposed and the surrounding member 30 collapses, so that the fry f is taken out of the surrounding member 30. Become. In addition,
In this embodiment, the mesh is a small hole.

In the first and second embodiments, the fish and shellfish growing container 10 may use the surrounding members 16 and 30 only for a part thereof.

In order to manufacture the surrounding member 16 from a biodegradable material, not only the compression molding method but also the casting method,
An extrusion molding method or the like may be used. Further, the small hole 18 of the outer surrounding member 16 may be formed by cutting after molding.

Furthermore, it goes without saying that conventional feeding may be used in combination. Also in this case, the number of times of feeding can be significantly reduced.

[0037]

According to the fish and shellfish growing container of the present invention,
The fry can grow by the bait exposed as the surrounding member is disassembled, and when the fry reaches a certain size, the surrounding member is disassembled and the fry goes out of the seafood growing container by itself. be able to. Therefore, labor required for feeding and releasing the fry can be saved. As a result, the installation location is not limited to a location close to the fish farmer's residence, so that the installation location can be expanded.

Further, since the surrounding member is made of a degradable resin, it disappears even if it is left in water as it is after installation. Therefore, the labor for collecting the fish and shellfish growing container can be saved.

Further, by forming the outer member by combining a plurality of materials having different degradability or different bait amounts, desired properties such as degradability can be easily obtained.

[Brief description of the drawings]

1 shows a first embodiment of a fish and shellfish growing container according to the present invention, and FIG. 1 (A) is an overall side view with a part cut away, FIG.
FIG. 2B is an enlarged cross-sectional view of a main part of the surrounding member in FIG.

FIG. 2 is a cross-sectional view of a main part showing a temporal change of the surrounding member and the fry in FIG. 1, and shows that time elapses in the order of FIGS.

FIG. 3 is a graph showing a growth process for each type of fry.

FIG. 4 is a graph showing the characteristics of days-weight change rate for each type of degradable resin. FIG. 4 (A) shows a (polyhydroxybutyrate / hydroxyvariate) copolymer, and FIG.
(B) shows polylactide, FIG. 4 (C) shows polyvinyl alcohol containing starch, and FIG. 4 (D) shows polycaprolactone.

FIG. 5 is a graph showing time-dependent changes in the size of the stoma and fry in FIG.

FIG. 6 is a main part side view showing a second embodiment of the fish and shellfish growing container according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fish and shellfish growing container 12 Degradable resin 14 Fry bait 16,30 Surrounding member 18 Small hole f Fry

Claims (2)

(57) [Claims] An outer member made of a material containing a degradable resin and bait of fry, and a small hole provided through the outer and front surfaces of the outer member and having a size capable of confining the fry, A seafood breeding container characterized in that the fry is decomposed so that the fry can come out of the surrounding member when the fry becomes a certain size. 2. The fish and shellfish growing container according to claim 1, wherein the surrounding member is made of a plurality of materials having different degradability or different bait amounts.