JP3875195B2 - Blue squid spawn - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an artificial squid laying reef that takes into account the habitat environment of squid larvae after hatching, such as ensuring octopus space for squid larvae and their feed organisms, as well as promoting laying of squid squid.
[0002]
[Prior art]
Aoi squid is a very delicious squid known by other names such as squid and moika, and it is one of the marine products that Japanese people like to eat. However, the natural spawning site of the sea squid has decreased in recent years, so the amount of landing is small and generally it is not around. In view of such circumstances, various artificial squid spawning reefs have been proposed in order to increase the amount of landing of squid.
[0003]
In Patent Document 1, a large number of elongate egg-laying bases, such as rod-shaped substitutes for seaweed stems, are erected on a base that lands on the seabed and the like, and at least one place in the egg-laying base is simulated. It describes a squid spawning reef characterized by an egg sac attached. This pseudo egg sac allows a flying squid to recognize that it is a place where eggs can be laid with peace of mind. Therefore, it is described that a large number of egg sac can be efficiently born. It also describes that the egg-laying substrate to be erected on the base is a pseudo-seaweed. Thereby, it is said that a place close to the natural egg-laying environment can be provided and egg-laying of the squid can be further promoted.
[0004]
Patent Document 2 discloses a spawning egg in which hairy pseudoalgae are fixed in a radial manner such that the tip of the pseudoalgae hangs down on the rod, and the pseudoalgae are arranged in a plurality of stages along the longitudinal direction of the rod. A squid spawning reef constructed from a forested base is described. Thereby, since the root vicinity of pseudo-algae can be shaded, it is said that a suitable place for spawning squid can be provided.
[0005]
In addition, the inventor himself has made some proposals on artificial fish reefs (for example, Patent Document 3 and Patent Document 4), and from these experiences, artificial fish reefs with a structure in which oyster shells are filled inside a water-permeable case are provided. It has been shown that it has a very high fish collection effect.
[0006]
[Patent Document 1]
JP 2001-275514 A (claims, embodiments of the invention, effects of the invention, FIGS. 1 and 2)
[Patent Document 2]
Registered Utility Model No. 3056823 (Scope of Claim for Utility Model Registration, Embodiment of Invention, Effects of Invention, FIGS. 1 to 6)
[Patent Document 3]
JP 2001-352858 A (Claims, Embodiments of the Invention, Effects of the Invention, FIGS. 1 to 5)
[Patent Document 4]
Japanese Patent Laid-Open No. 2002-45079 (Claims, Embodiments of the Invention, Effects of the Invention, FIGS. 1 to 5)
[0007]
[Problems to be solved by the invention]
The squid spawning reefs of Patent Document 1 and Patent Document 2 are expected to have a certain effect in terms of promoting spawning to the squid, but because of the lack of a small and complicated space, the squid larvae after hatching are from natural enemies. There are few places where small crustaceans and small fish that can hide themselves and gather and breed. In this case, even if the squid lays egg sac on the spawning reef, the number of eggs and larvae will be significantly reduced, resulting in poor production efficiency. Also, many of the larvae that hatched safely do not settle on the spawning reef, but move to a place away from the spawning reef in search of food. However, it is difficult to have a direct effect on the increase in landing volume. Furthermore, there is a drawback that labor and cost are required in the production and maintenance of pseudo algae.
[0008]
If the habitat of the squid larvae and their feed organisms was provided on the egg-laying substrate, the habitat space would erode the place suitable for egg-laying of the squid, and the habitat was provided separately from the egg-laying substrate. Then, it makes the spawning reef big. In either case, there is a risk that the cost for production and maintenance of the spawning reef will increase. For this reason, it is considered extremely difficult to develop a low-cost spawning reef that reconciles the place where sprouts can lay eggs and the habitat of their larvae and feed organisms.
[0009]
Moreover, although the fish reefs of Patent Document 3 and Patent Document 4 are fish reefs suitable for collecting fish, they reflect the unique ecology of the squid, such as laying eggs in relatively bright places inside dense seaweed areas such as Kajime and Honda Walla. It cannot be said that the effect as a squid spawning reef is not expected.
[0010]
Because squid is remarkably different from fish in its form and ecology, the development of squid spawning reefs is not an extension of the development of artificial reefs for the purpose of breeding and anchoring fish, but generally different technologies It is believed that. In addition, various ecology is recognized in the same squid category, for example, squid prefers spawning on a shelf-like ceiling part such as a rock shelf, while squid is a large seaweed such as Kajime and Honda walla. It is known to lay eggs in preference to rod-shaped stems. Development of a spawning reef for a specific organism is very difficult because it must reflect the unique ecology of the organism. The inventor has succeeded in developing an artificial squid laying reef that has solved the above-mentioned problems after many years of research.
[0011]
[Means for Solving the Problems]
The above-mentioned problem is that the laying egg reef is constructed by arranging a laying egg unit erected on a base in a structural skeleton, and the laying egg base is a shell or shell inside a water-permeable cylindrical case. It is solved by a squid spawning reef characterized by being filled with shell-like members.
[0012]
Here, the shell-like member means a member whose filling rate when it is randomly packed in a cylindrical case is equivalent to that when a oyster shell or a clam shell is randomly packed in the same cylindrical case. Examples thereof include tiles, stones, tree branches, wood pieces, metal pieces, shells of shellfish such as coral and shrimp, and those obtained by processing them into appropriate sizes and shapes.
[0013]
As a result, it is possible to secure a place where small crustaceans and small fish serving as larvae gather and reproduce within the egg-laying base without eroding the place where the squid spawns.
[0014]
At this time, it is preferable that the cylindrical case has a plurality of openings that are large enough for the squid larvae to enter and exit. Thereby, not only the feed organism but also the habitat space of the squid larvae themselves can be secured on the egg-laying substrate, which is more preferable.
[0015]
In addition, the egg-laying unit is preferably erected with a sufficient interval for the adult squid to pass through a plurality of egg-laying bases. As a result, the passage of the adult squid can be secured, the tide inside the egg laying unit can be secured, and the sand that may damage or bury the squid egg sac becomes difficult to accumulate.
[0016]
Furthermore, it is also preferable that the squid spawning reef has a plurality of layers configured by arranging egg-laying egg bases or egg-laying units. As a result, the space inside the laying reef can be used effectively, and the production efficiency per laying reef can be increased.
[0017]
In this case, it is desirable to have a pseudo submarine layer formed by arranging a plurality of egg-laying bases in parallel so that the longitudinal direction thereof is the horizontal direction. As a result, it is possible to provide an environment in which the squid that has migrated to the layer above the pseudo-sea floor can settle and lay eggs.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the squid spawning reef of the present invention will be described more specifically with reference to the drawings. FIG. 1 is a perspective view of a state where the squid spawning reef is disassembled for each layer, and FIG. 2 is a perspective view of the squid spawning reef. FIG. 3 is a perspective view of a small cylindrical case, FIG. 4 is a perspective view of a large cylindrical case, and FIG. 5 is a perspective view of an egg-laying base formed by filling an oyster shell inside the cylindrical case. 6 and 7 are perspective views of the egg-laying unit in which the egg-laying base is erected on the base. FIG. 8 is a perspective view of a state in which a flexible linear member having seaweed spores attached thereto is wound around an angle steel. FIG. 9 is a perspective view of a flexible linear member having seaweed spores attached to a cylindrical case. It is a perspective view of the wound state. FIG. 10 is a perspective view of an egg-laying base formed by filling a portion of the inside of the cylindrical case with oyster shells, and FIGS. 11 and 12 are perspective views of the egg-laying unit in which the egg-laying base is erected on the base. FIG. In FIG. 1, FIG. 2, FIG. 6 to FIG. 8, FIG. 11, and FIG.
[0019]
As shown in FIG. 1, the squid spawning reef has a hierarchical structure of a first layer 1, a second layer 2, and a third layer 3, and the structural frame is made of angle steel. What assembled this is the squid spawning reef 7 shown in FIG. The size of the squid spawning reef 7 is not particularly limited, but in the present embodiment, the vertical and horizontal dimensions are 2.0 m and the height is 1.6 m.
[0020]
The first layer 1 has a structure that supports the egg-laying unit 4 at a certain distance from the seabed. For this reason, it becomes possible to prevent sand from flowing in and accumulating on the egg-laying unit. In the first layer 1 and the third layer 3, each of the four egg-laying units 4 is arranged in 2 rows and 2 columns, and the base 5 is supported by the structural housing so as to be horizontal.
[0021]
In the second layer 2, twelve egg-laying bases 6 are arranged in 2 rows and 6 columns at appropriate intervals, and supported by the structural housing so that the longitudinal direction thereof is the horizontal direction. The reason for arranging them at an appropriate interval is to ensure the illuminance in the first layer 1. The second layer 2 serves as a simulated seabed, and provides an environment where the squid can settle down and lay eggs in the third layer 3. The sea squid considers this because it doesn't like the place of spawning too far from the seabed. When a layer such as the first layer 1 or the third layer 3 is desired to be provided on the layer above the third layer 3, a pseudo submarine layer such as the second layer 2 may be provided therebetween.
[0022]
As shown in FIG. 6 or FIG. 7, the egg-laying unit 4 has a plurality of egg-laying bases at a position that is 90 ° rotationally symmetric when viewed from the vertical upper side on the upper surface of the concrete base 5 with reinforcing bars. Is preferably erected. As a result, the egg-laying unit 4 not only has a good weight balance and is not easily washed away by the tidal current, but also has a property as a common unit, and has a high degree of freedom in arrangement to the structural housing. The shape of the base 5 is not limited to a square, and may be a regular triangle or a regular hexagon.
[0023]
Moreover, it is preferable that the interval of standing the egg-laying base on the base is sufficient to allow the adult squid adult to pass through, considering that the average width of the adult squid squid is about 10 to 15 cm. This interval is preferably 10 to 30 cm. If this distance is less than 10 cm, the passage of the adult squid that came to lay eggs cannot be secured, and at the same time, the tide is poor, and sand that may damage or bury the laid egg sac is likely to accumulate. On the other hand, if this interval is larger than 30 cm, the number of egg-laying substrates per unit area in the egg-laying unit 4 becomes too small, resulting in an egg-laying reef with poor production efficiency. Furthermore, there is a risk that the squid that prefers a dense seaweed as a spawning place will be avoided as a spawning place. In this embodiment, this interval is set to 20 cm.
[0024]
The egg-laying base 6 is formed by filling a shell or a shell-like member inside a cylindrical case. At this time, it is preferable to attach a lid to the upper surface of the cylindrical case. Thereby, it becomes possible to prevent the filled shells and the like from flowing out of the cylindrical case due to the tide. The lid preferably has water permeability in order to ensure vertical tide inside the egg-laying base. FIG. 5 shows the egg-laying base 6 in which the oyster shell 12 is filled in the cylindrical case 17. In order to prevent the oyster shell 12 from flowing out, a water-permeable upper surface 21 is attached.
[0025]
As shown in FIG. 6 or FIG. 7, it is preferable that the egg-laying unit 4 is used in combination with egg-laying bases 6 having different sizes and forms. In this embodiment, the small cylindrical case 9 shown in FIG. A small egg-laying base 11 filled with oyster shells and a large egg-laying base 13 filled with oyster shells 12 in a large cylindrical case 10 shown in FIG. 4 are used.
[0026]
As a result, the squid larvae can move their mushrooms within the spawning reef as they grow. In this embodiment, the large cylindrical case 10 has a substantially rectangular opening having a vertical width of 3 cm and a horizontal width of 4 cm, and is suitable for a relatively small squid larvae. The small cylindrical case 9 has a substantially rectangular opening having a vertical width of 5.5 cm and a horizontal width of 5 cm, and is suitable for a relatively large larvae mushroom. Both types of cylindrical cases are set to a height of 35 cm.
[0027]
The cylindrical case is preferably formed by welding an annular member and a rod-shaped member, or formed by bending an expanded metal into a cylindrical shape, and other such as a punching metal formed into a cylindrical shape, a wire It is also preferable to form a net made of a linear member such as a cylinder. This is because they have many rod-like parts that the squid prefers to lay eggs. The material of the cylindrical case may be a metal such as copper or aluminum, or a resin such as plastic, but in this embodiment, iron is used. When the cylindrical case is made of iron, it is possible to weld the lower end of the cylindrical case and the reinforcing bar arranged on the base, and the connection between the egg-laying base and the base can be made strong. . In this case, the inflow and curing of the concrete forming the base are performed after the welding is finished.
[0028]
The filling of the shell or shell-like member into the cylindrical case is preferably performed at a filling rate that does not impede water permeability at that location. When filling shells, oyster shells or clam shells with relatively large shells or relatively large folds from the viewpoints of acquisition cost, water permeability, formation of habitat for squid larvae and their feed organisms, waste disposal, etc. Is the best. Shell-like members may be tiles, stones, tree branches, pieces of wood, pieces of metal, etc., or any of those processed into an appropriate size and shape, especially shellfish such as coral and shrimp. Shells are preferred because they do not require special processing. The filling material inside the cylindrical case is not limited to one type, and may be a mixture of a plurality of materials selected from the above-mentioned shells or shell-like members.
[0029]
At this time, each shell of the shell or shell-like member may be filled so that it completely fits inside the cylindrical case, but some shells are protruded from the opening on the side of the cylindrical case. Also good. In particular, oyster shells and clam shells are relatively similar in shape and size to the leaves of seaweeds such as honda walnuts and scallops that sea squid prefers to lay eggs. It is preferable because it is possible to provide an environment similar to the leaf shade that the squid prefers as a spawning place. Further, since the surface of the egg-laying base 6 has a more complicated shape and makes it difficult for echinoderms having pipe feet such as starfish and sea urchins to walk, the egg sac can be protected from predation by these echinoderms. . Furthermore, floating seaweed spores are also preferable because they tend to adhere to the surface of the egg-laying substrate 6.
[0030]
It is also preferable to fill a part of the inside of the cylindrical case with a shell or a shell-like member. Thereby, not only the tide inside the egg-laying unit is improved, but also the illuminance inside the egg-laying unit can be increased. At this time, it is preferable that a hollow portion is formed below the space filled with shells and the like (hereinafter referred to as a filling portion) inside the cylindrical case. Thereby, it becomes possible to arrange the habitat space of the squid larvae and their feed organisms at a high position where they are not easily attacked by their natural enemies. When a cavity is formed on the lower side of the filling portion, a support member is disposed so that a filling material such as a shell does not fall. The support member preferably has water permeability in order to ensure vertical tide inside the egg-laying base. FIG. 10 shows the egg-laying base 6 in which the upper half of the cylindrical case 17 is filled with the oyster shell 12. A water-permeable bottom surface 18 is provided as a support member. The arrangement of the filling portion inside the cylindrical case is not limited to the upper half inside the cylindrical case, but may be other arrangements such as the upper third, the upper two thirds, the middle third, etc. Good. You may provide a some filling part in one egg-laying base.
[0031]
When the egg-laying base in which shell shells or the like are filled in a part of the inside of the cylindrical case is disposed on the base, as shown in FIG. 11 or FIG. 12, the height of the filling portion (hatched part in the figure) of each egg-laying base However, it is preferable to arrange so as to be as different as possible from the height of the filling portion of the adjacent egg-laying base. Thereby, the tide of each filling part becomes favorable, and it becomes possible to supply sufficient oxygen to the squid larvae and their feed organisms that live in the filling part.
[0032]
In order to make the squid spawning reef more suitable, it is preferable to appropriately attach spores of seaweed preferred by the squid spawning place such as swordfish and honda walla to the rod-shaped portion of angle steel or cylindrical case. Since seaweeds grow on the spot where the spores are attached, the spawning place of the squid can be greatly increased. In addition, since the surface of the structural body and the surface of the egg-laying base are appropriately covered with the leaves, it is possible to protect the squid larvae inside the egg-laying reef from natural enemies.
[0033]
As shown in FIG. 8 or FIG. 9, the spore is preferably attached by directly winding a flexible linear member 14 such as a Cremona thread soaked with seaweed spores around an angle steel 15 or a cylindrical case 17. Since this adhesion method does not use an adhesive or the like, there is no possibility that chemical substances that may naturally have an adverse effect are eluted into seawater, and there is no possibility of inhibiting spore germination.
[0034]
The squid laying reef is preferably installed on the seabed at a depth of 20 m or less. This is because the sea squid spends its entire life in waters shallower than 20m. Furthermore, in consideration of visiting and laying eggs in a shallow sea area where the waves are shallower than 10 m in the spawning season, it is more preferable that the depth is less than 10 m.
[0035]
【The invention's effect】
The squid spawning reef of the present invention has a structure in which space can be effectively used, for example, the structure of the structure has a hierarchical structure, so that the production efficiency can be increased. In addition, the egg-laying unit provides an environment similar to the densely populated area of seaweed that the squid prefers as a place for laying eggs. Furthermore, since the egg-laying substrate has many small and complex spaces inside it, it is possible to provide a habitat for the squid larvae and their feed organisms. It is environmentally friendly. In addition, by configuring the cylindrical case with a frame, it is possible to secure more rod-shaped portions suitable for laying squid.
[0036]
As described above, the squid spawning reef of the present invention provides not only the spawning of the squid, but also the artificial squid spawning reef in consideration of the habitat environment of the squid larvae after hatching at low cost. .
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of a state where a squid spawning reef is disassembled for each layer.
FIG. 2 is a perspective view of a squid spawning reef.
FIG. 3 is a perspective view of a small cylindrical case.
FIG. 4 is a perspective view of a large cylindrical case.
FIG. 5 is a perspective view of an egg-laying base formed by filling a cylindrical case with oyster shells.
FIG. 6 is a perspective view of an egg-laying unit in which an egg-laying base is erected on a base.
FIG. 7 is a perspective view of an egg-laying unit in which an egg-laying base is erected on a base.
FIG. 8 is a perspective view of a state in which a flexible linear member having seaweed spores attached thereto is wound around angle steel.
FIG. 9 is a perspective view of a state in which a flexible linear member having seaweed spores attached thereto is wound around a small cylindrical case.
FIG. 10 is a perspective view of an egg-laying base formed by filling a portion of the inside of a cylindrical case with oyster shells.
FIG. 11 is a perspective view of an egg-laying unit in which an egg-laying base is erected on a base.
FIG. 12 is a perspective view of an egg-laying unit in which an egg-laying base is erected on a base.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st layer 2 2nd layer 3 3rd layer 4 Laying egg unit 5 Base 6 Laying egg base 7 Blue squid egg reef 8 Blue squid 9 Small cylindrical case 10 Large cylindrical case 11 Small laying egg base 12 Oyster shell 13 Large laying egg Base 14 Flexible linear member 15 Angle steel 16 Egg sac 17 Cylindrical case 18 Water permeable bottom surface 19 Filling portion 20 Cavity portion 21 Water permeable upper surface

Claims (5)

In the squid laying reef constructed by placing a laying egg unit on a base in a structure housing, the laying egg base has a shell or a shell-like member inside a water-permeable cylindrical case. A squid spawning reef characterized by filling. The squid spawning reef according to claim 1, wherein the cylindrical case has a plurality of openings that are large enough for squid larvae to enter and exit. The spawning egg reef according to claim 1 or 2, wherein the spawning unit is erected on a plurality of spawning bases with sufficient spacing to allow the adult fried squid to pass through. The squid laying reef according to any one of claims 1 to 3, wherein the squid laying reef has a plurality of layers formed by arranging a laying egg base or a laying egg unit. The squid spawning reef according to claim 4, wherein the squid spawning reef has a pseudo submarine layer formed by arranging a plurality of spawning bases in parallel so that the longitudinal direction thereof is a horizontal direction.

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