JP3056823U - Spawning nest structure in a reef fish - Google Patents

Abstract

(57) [Summary] [Problem] To provide an egg laying nest structure in a fish squid reef that can efficiently create an optimal spawning environment according to the spawning habit of the squid. SOLUTION: A hairy pseudoalgae is fixed to a rod body in a radial form such that the tip thereof hangs down flexibly, and the pseudoalgae are arranged in a plurality of steps at a required interval along the longitudinal direction of the rod body. The laying ovary base material thus constructed is constructed by arranging it in the interior space of a fish squid reef. [Effect] The spawning amount and hatching rate of the squid can be improved, and the amount of the squid landing can be increased.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an improvement of a fish squid reef, and more particularly, to a spawning nest structure in a fish squid reef that can efficiently create an optimal spawning environment according to the spawning habits of the squid.

[0002]

[Prior art]

 As is well known, squid is a marine cephalopod that Japanese people prefer to eat, and there are many ways to cook the squid. In particular, among the types of squid, Aori squid is preferred by everyone because of its good taste, but the fact is that it is taken up by high-quality restaurants and is not generally sold because the amount of landing is too small. .

[0003] In view of such circumstances, in order to increase the amount of Aori squid landing, a method has been adopted in which artificial reefs are laid on the seabed in the coastal waters to adjust the spawning environment of the squid and propagate them. . Such artificial reefs have been proposed in which a bar-shaped substrate made of synthetic fiber material is planted in the interior space of a concrete weight block consisting of a canopy plate and a bottom plate.

Although some results have been obtained by laying down artificial reefs as described above, satisfactory results have not yet been obtained. Therefore, the present inventors examined the spawning habits of the squid in detail in order to further increase the catch, and found the following facts. In other words, Aori squid does not spawn evenly on the bushes inside the artificial reef, but has the habit of intensively laying tufted eggs on the rod portion of the flocking rod-like base material that stands in the forest. It is a fact. In this regard, the squid has a habit of laying eggs on the back of the canopy plate of the weight block instead of the rod-shaped base material.The spawning habits differ depending on the type of squid as described above. For many years, the inventor of the present invention has found that it is necessary to design a fish reef that matches the habit of the squid.

For this reason, it is necessary to take measures according to the spawning habits of the squid, which is the object of the present invention, and a conventional rod-shaped base (see FIG. 1) in which a large number of synthetic fiber materials are continuously and radially planted along a rod. Simply laying forests in the interior space of the heavy blocks does not provide sufficient spawning results. That is, in the rod-shaped base material shown in FIG. 7, since most of the rods that Aoli squid prefers to lay eggs are buried in the flocked plant, a place suitable for spawning Aoli squid is sufficiently obtained inside the artificial reef. There was a disadvantage that there was no.

[0006]

[Problems to be solved by the invention]

 The present invention has been made in view of the above-mentioned disadvantages of the conventional artificial reef, and is a fish reef for a squid that can efficiently create an optimal spawning environment according to the spawning habit of the squid. It is a technical task to provide the ovary structure in Japan.

[0007]

[Means for Solving the Problems]

 The means adopted by the present inventors to solve the above technical problem will be described below with reference to the accompanying drawings.

That is, according to the present invention, the hairy pseudoalgae are fixed to the rod in a radial form such that the tip thereof hangs down in a flexible manner, and the pseudoalgae are provided in a plurality of steps at a required interval along the longitudinal direction of the rod. The above-mentioned problem is solved by adopting a method in which a spawning base material which is arranged in a natural manner is constructed in the inner space of a fish squid.

[0009]

[Embodiment of the invention]

 Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings. FIG. 1 is a side view of a fish squid reef according to an embodiment of the present invention, and FIG. 2 is a plan view showing the arrangement of the spawning nest bases in the inner space of the fish reef according to the embodiment by dotted lines. FIG. 3 is a side view of one spawning base material used for the fish reef of the present embodiment, FIG. 4 is a side view of another spawning base material used for the fish reef of the present embodiment, and FIG. FIG. 6 is a side view of the spawning base material and its mounting frame provided in FIG. 6, FIG. 6 is an explanatory view showing a state in which a blue squid spawns on a rod portion of the spawning base material of the fish reef of the present embodiment, and FIG. It is a perspective view of a rod-shaped substrate.

First, the structure of a fish squid for a squid, which is an embodiment of the present invention, will be described with reference to FIGS. In the figure, the one designated by reference numeral 1 is a concrete heavy block placed on the seabed in the coastal sea area. The weight block 1 includes a bottom plate 12 (240 cm in diameter), a canopy plate 11 (200 cm in diameter) covering the bottom plate 12, and an internal space S between the canopy plate 11 and the bottom plate 12. It is composed of side walls 13, 13, 13 with windows that separate the windows. The spaces separated by the side walls 13, 13, 13 are open so that they can be freely blown into each other, and a through hole 11a is also opened in the center of the canopy plate 11 so that upper and lower tides can be provided. Has become. On the upper surface of the bottom plate 12, three inverted U-shaped hanging brackets 14, 14, 14 are fixed at an angle of 120 degrees, and the hanging block 14 is hooked with a crane hook or the like to hold the weight block 1. Can be lifted and hung. In this embodiment, the distance between the canopy plate 11 and the bottom plate 12 is set to about 70 cm.

The one designated by reference numeral 2 is a steel mounting frame disposed in an internal space S defined by the side walls 13 between the canopy plate 11 and the bottom plate 12 of the weight block 1. The overall shape is a rhombus. The mounting frame 2 is provided with insertion holes 21 (not shown) at predetermined intervals, and a spawning base material described later is inserted into each of the insertion holes 21.

[0012] What is indicated by reference numeral 3 is a spawning base material that is erected in the internal space S of the weight block 1 via the mounting frames 2, 2, .... The spawning base material 3 is formed by sticking a number of hairy pseudoalgae 32, 32,... In a radial shape such that the tips thereof flex and hang down on a rod 31 made of synthetic resin. The algae 32 are arranged in plural stages along the longitudinal direction of the rod 31 at required intervals. The spawning base material 3 is a bundle of hairy pseudoalgae 32 made of corrosion-resistant synthetic fibers having appropriate elasticity (in the present embodiment, nylon fibers are used). Then, if the vicinity of the root of the synthetic fiber bundle is fixed to the surface of the rod 31 with an adhesive or the like and the rod 31 is turned upside down, the tip of the pseudoalga 32, 32,. It hangs down and becomes a form as the spawning base material 3. When the both ends of the rod 31 are inserted into the insertion holes 21 of the upper and lower mounting frames 2. The ovarian base materials 3, 3,... Can be established in the internal space S between the canopy plate 11 and the bottom plate 12.

Further, as the above-mentioned spawning base material 3, three groups of pseudoalgae 32, 32... Are fixed to a single rod 31 at required intervals (see FIG. 3), and one Are fixed to the rod 31 of the two groups at a required interval (see FIG. 4). The group of pseudoalgae 32, 32,... Are arranged approximately in the middle of the pseudoalgae 32, 32,... And the pseudoalgae 32, 32,. Level position is set. When these two types of spawning bases 3, 3 are alternately established, as shown in FIG. 5, the adjacent spawning algae 32, 32,. The pseudoalgae 32 of the ovarian bases 3, 3,... Hang down and surround the rod 31. In the present embodiment, nylon fibers are used as the corrosion-resistant material of the hairy pseudoalga 32, but polyolefin fibers such as polypropylene and polyethylene, or polyester fibers can also be adopted. Also, since one hairy pseudoalga 32 is composed of twisted yarns obtained by twisting six synthetic fiber yarns, pseudoalgae 32, 32 ... consisting of a large number of synthetic fiber yarns can be efficiently produced. Moreover, the twisted yarn is loosened after being put into the sea, and the pseudo effect is further enhanced. The material of the rod 31 is a tough and highly elastic material, for example, synthetic resin such as fiber reinforced plastic (FRP) using glass fiber. It is possible to efficiently perform the work of bending and inserting the both ends into the mounting frames 2, 2,..., And to withstand the shock of the sea waves. The rod 31 preferably has a diameter of about 7 mm to 10 mm. Further, as a bonding agent for fixing the pseudoalga 32, 32,... To the rod body 31, a harmless resin that does not dissolve in the sea is used, and thus the safety is excellent.

As described above, the hairy pseudoalga 32, 32,... Are planted on the rod body 31 at required intervals to produce an ovary nest base material 3, which is disposed in the weight block 1 to form a fish reef. By constructing and submerging it in a predetermined sea area, it is possible to form a spawning site suitable for the squid C. More specifically, as shown in FIG. 5 and FIG. 6, the rod 31 near the root of each pseudoalga 32, 32,. Because the surrounding area is shaded by algae 32, 32, ..., Aoi squid C enters into the shaded part and pseudo algae 32, 32, ... … Will be born, but since it is invisible to an enemy due to such a configuration, the egg sac EE will not be attacked by the enemy and the hatchability will be improved. . In other words, the roots of the pseudoalgae 32, 32,... In the rod 31 of the laying nest substrate 3 are realized as a suitable place for laying the squid C. The distance between the upper and lower pseudoalgae 32, 32 ... and the pseudoalgae 32, 32 ... is as short as possible without the shade of the rod 31 and the natural algal grass W etc. The length is set to an appropriate length so that the upper and lower pseudoalgae 32 are hardly connected to each other, and is about 18 cm in the present embodiment. Incidentally, the entire length of the rod 31 is about 70 cm. In other words, if the vertical interval is too long, the exposed bar 31 increases, and if the interval is too short, the natural algal grass W etc. will become pseudoalgae 32, 32, ... over time.・ ・ Attached to ・ Pseudoalgae 32 which are piled up and connected to each other, and a large number of pseudoalgae 32 ・ 32 ・ ・ ・Is buried.

Further, each hairy pseudoalga 32 of the above-mentioned oviposition substrate 3 is formed by fixing a large number of synthetic fibers having appropriate elasticity to the rod 31 in a radial form, so that they flow in the sea. When natural algal grass W such as diatoms adheres and accumulates on the pseudoalgae 32, 32,... Over time, the pseudoalgae 32, 32,. The tip of ... hangs down more like a bow, and the shade effect is further enhanced.

Although the embodiments of the present invention are generally as described above, the present invention is not limited to the above-described embodiments, and various changes may be made within the description of “claims for registering utility model”. For example, in the spawning base material 3 of the present embodiment, a linear rod 31 is used, but a branch-like rod 31 having branching branches may be employed. The distance between the upper and lower pseudoalgae 32, 32,... And the pseudoalgae 32, 32,... In accordance with the size and the degree of bending of each pseudoalgae 32 of the spawning base 3 Can be changed as appropriate, and it is needless to say that any of these modified modes belongs to the technical scope of the present invention.

[0017]

[Effect of the invention]

 As described above with reference to the embodiment, in the present invention, the hairy pseudoalgae is fixed to the rod body in a radial shape so that the tip thereof hangs down, and the pseudoalgae extends along the longitudinal direction of the rod body. The spawning nests, which are arranged in multiple stages at the required intervals, were built in the interior space of the blue squid fish reef. It will be a good place for spawning Aori squid. In addition, the position of the spawning base material and the pseudo-algae of the adjacent spawning base material drop down between the upper and lower hairy pseudoalgae in the spawning base material so as to surround the respective rods. By setting the algae level position, the surroundings of the rods of the spawning base material become more shaded, and an optimal spawning environment for the squid can be efficiently created. Therefore, the spawning amount and hatching rate of the squid can be improved, and the landing amount of the squid can be further increased.

[Brief description of the drawings]

FIG. 1 is a side view of a fish squid reef according to an embodiment of the present invention.

FIG. 2 is an explanatory plan view showing, by dotted lines, an arrangement state of laying ovary bases erected in the inner space of the fish reef of the embodiment.

FIG. 3 is a side view of one spawning base used in the fish reef of the embodiment.

FIG. 4 is a side view of another spawning substrate used in the fish reef of the embodiment.

FIG. 5 is a side view of the spawning nest substrate disposed inside the fish reef of the present embodiment and the attachment frame thereof.

FIG. 6 is an explanatory diagram showing a state in which a blue squid lays eggs on a rod portion of a spawning base material of the fish reef of the present embodiment.

FIG. 7 is a perspective view of a conventional rod-shaped substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weight block 11 Canopy plate 11a Through-hole 12 Bottom plate 13 Side wall 14 Hanging fitting 2 Mounting frame 21 Insertion hole 3 Oviposition base material 31 Rod 32 Hairy pseudoalga C Aoriika E Egg sac S Internal space W Natural alga

Claims (2)

[Utility model registration claims] 1. A hairy pseudo-algae is fixed to a rod body in a radial form such that the tip of the pseudo-algae hangs down flexibly, and the pseudo-algae is arranged in a plurality of steps at a required interval along the longitudinal direction of the rod body. A spawning nest structure in a fish squid reef characterized by comprising a spawning nest substrate formed in a forest inside a fish squid reef. 2. The position of each spawning base material such that the pseudoalgae of the adjacent spawning base material falls between the upper and lower hairy pseudoalgae in the spawning base material and surrounds each of the rods. 2. The spawning nest structure in a squid fish reef according to claim 1, wherein the level position of the pseudoalga is set.