JPH0229900Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is laid out in the sea in shallow waters or on the seabed, and aims to protect and nurture fish and shellfish eggs and fry as well as supply food, and the survival rate and growth rate after spawning under natural ocean conditions. This invention relates to a breeding substrate that can increase fish and shellfish resources.

As seafood resources have been rapidly depleted in recent years,
In place of traditional unilateral fishing methods, efforts are being made to increase resources through aquaculture and multiplication.
Artificial seedling and hatching techniques for a wide variety of seafood have already been established, and aquaculture, which can be done on a small scale and with sufficient cultivation management, is gradually being expanded.However, from the perspective of increasing seafood resources, Propagation, which involves producing and reproducing on a large scale under vast natural ocean conditions, is an essential requirement.

However, until recent years, as a result of the construction of coastal factories and the creation of numerous accompanying roads and port facilities adjacent to shallow waters where fish and shellfish are produced and reproduced under natural ocean conditions, fish and shellfish In addition to the destruction and disappearance of the grass beds and flax beds that are the production and reproduction sites, the siltation and disappearance of the grass beds and flax beds due to the drifting movement of tidal currents is accelerated, and in addition, the destruction and disappearance of the grass beds and flax beds, which are the sites of production and reproduction, is accelerated. Algae cannot grow or die due to the accumulation of sludge caused by
Alternatively, enrichment due to the influx of large amounts of nitrogen and phosphorus increases, resulting in the inability of algae to grow due to the abnormal proliferation of specific biological groups, such as calcareous algae and colony warts, which are hidden and protected from external enemies. Not only are spawning sites and hatched hatchlings no longer having places to escape, the dead egg rate is increasing dramatically, but also viable eggs and hatched hatchlings are easily eaten by higher-ranking predatory fish and shellfish, and their survival rate is also increasing. Moreover, due to the lack of algae, which is the food necessary for raising young, the intake intensity in the feeding cycle has increased significantly, so even if a large amount of water is released for artificial hatching, the growth of the algae will be reduced. As a result, they are eaten by higher-ranking predatory fish and shellfish without waiting.

Therefore, in order to increase the number of seafood,
When spawning fish and shellfish, it is strongly desired to create a place where eggs and hatched hatchlings can be hidden or protected from predators, and where food can be supplied so that they can be sufficiently nurtured. However, no appropriate measures have been taken to date, and the proliferation of fish and shellfish has been significantly delayed.

The present invention was developed in view of the above problem, and the present invention improves the laying of eggs accompanying the spawning of fish and shellfish simply by spreading or laying them in shallow waters, and also improves the hatching of the eggs and the post-hatching A breeding substrate that hides and protects young fish and at the same time creates a seaweed bed in a short time, provides sufficient food for raising young fish, and promotes the growth of fish and shellfish under natural marine conditions. The aim is to provide materials.

Examples of the present invention will be described below in detail based on the drawings. Figure 1 is a sketch of the glass fiber blended yarn used in the present invention, and Figure 2 is a cross-sectional explanatory diagram of the present invention using glass fiber blended yarn for the warp. Since the glass fibers 1A used in the glass fiber blend yarn 1 need to be broken when the warp and weft intersect and bend during weaving, the single yarn diameter is required to be at least 9 μm or more, and If the diameter is large, it becomes easy to break, which significantly reduces weaving processability, and the broken part becomes more punctured and difficult to handle, so it is limited to a maximum diameter of 40 μm or less. The material, thickness (fineness), and mixing ratio of the other fibers 1B to be mixed and twisted with the glass fibers 1A are determined as appropriate depending on the characteristics of use, and the effects of long-term use or shallow waves. When used in a place exposed to strong currents or a place with fast currents, it is preferable to use a material that is durable, strong, and has a relatively high specific gravity, and synthetic fibers, particularly polyamide-based or polyester-based synthetic fibers, are suitable. The thickness of the other fiber 1B is preferably one having a single yarn diameter that is approximately the same as that of the glass fiber 1A for the purpose of twisting, but if the woven fabric is to be given stiffness and elasticity, a thicker one may be used. It is possible. The number of twists of the glass fiber mixed yarn 1 varies depending on the thickness of the glass fiber mixed yarn 1,
Usually, if the thickness is less than 1mmφ, approximately per 1m
Approximately 30 to 100 times is suitable. In addition, if it is necessary to increase the attached growth of algae or to increase the hiding and escape protection of young algae, use 30 to 70% of glass fiber 1A.
It is preferable to increase the amount by about % to increase breakage. It is important to use the glass fiber blend yarn 1 as the warp, weft, or warp and weft to weave at a high density to the extent that no weaving gaps are created between the warp and weft. That is, glass fiber blend twisted yarn 1
In order to break the glass fibers 1A which are mixed and twisted during weaving, it becomes impossible to break the glass fibers when the so-called curvature radius R ₁ is large and the degree of cross-inflection between the warp and weft is small, as shown in FIG. 3A. Therefore, the third
As shown in Figure B, by weaving at such a high density that no weaving gaps are created between the warp and weft, the degree of cross inflection is increased, and by reducing the so-called radius of curvature _R2 , the glass fiber 1A is broken and the surface of the fabric is A base material 2 of the present invention is produced in which a broken raised part 2A is formed on the back surface. In such a case, glass fiber 1
The weaving density sufficient to break A varies depending on the thickness of the warp and weft used, but if the thickness is 1 mmφ, both the warp and weft should be approximately 12 or more per inch, and the thickness is 0.5 mmφ. In this case, a weaving density of approximately 24 fibers or more per inch interval is sufficient. If it is necessary to form a large number of broken raised portions 2A due to usage characteristics, the glass fiber mixed twisted yarn 1 may be used for the warp and weft, and when the broken raised portions 2A are formed long or the broken raised raised portions 2A are formed in large numbers.
In cases where B needs to be made large, adjustment can be made freely by using warp and weft yarns with thick diameters.

The substrate 2 of the present invention can be used by sewing it into a sheet of the required width and length as shown in Fig. 4 and laying it on the seabed, or by weaving it into a thin tape. The net-like material or the thin tape-like material is further knitted into a net shape, and then these are spread under the sea using appropriate means for use.

The present invention has the above-mentioned structure, and since a large number of broken raised parts made of glass fibers are formed on the front and back surfaces of the fabric, it is possible to efficiently filter and attach fish and shellfish eggs flowing in the sea. Not only can floating algae spores and zoospores adhere to glass fibers, but the adhesion of floating algae spores and zoospores is extremely high due to the stimulation of running water by the broken nape and the characteristics of the glass material. The translucency of the water promotes photosynthesis, and the growth and reproduction occur in a short period of time, forming a seaweed bed, which not only provides food for the young, but also serves as a food source for the eggs that have settled. Even when fish and shellfish approach, they are protected by the piercing nature of the tip of the broken nape, and the hatchlings can hide and take shelter in the seaweed beds that form in a short period of time or in the gaps between the broken napes, which reduces survival and growth rates. This will lead to a significant improvement in fish and shellfish resources, and will greatly contribute to the increase in fish and shellfish resources.
Furthermore, even when this invention is installed on the seabed, the broken raised part on the back of the fabric is buried and locked in the seabed, resulting in a very high grounding resistance. It can be said that it is a substrate for the propagation of fish and shellfish that has many features such as being able to be laid stably without the risk of swaying even when tidal current resistance is applied.

[Brief explanation of the drawing]

Fig. 1 is a sketch of glass fiber mixed yarn, Fig. 2 is a cross-sectional diagram of the present invention using glass fiber mixed yarn as the warp, and Fig. 3 is an explanatory diagram of the breakage principle of glass fiber.
FIG. 4 is a usage diagram. Explanation of symbols, 1...Glass fiber blended twisted yarn, 1A...
...Glass fiber, 1B...Other fibers, 2...Product of the present invention, 2A...Broken raised portion, 2B...Broken raised gap.

Claims (1)

[Scope of utility model registration request] A glass fiber mixed yarn made by mixing and twisting glass fibers with a single yarn diameter of 9 to 40 μm and other fibers with an appropriate single yarn diameter in the required ratio is used as the warp, weft, or warp yarn, and is used between the warp and the weft. 1. A substrate for propagating fish and shellfish, characterized in that glass fibers are broken by weaving at a high density so that no weaving gaps are created, thereby forming broken raised portions on the front and back surfaces of the fabric.