JP2003339289A - Fish-luring material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fish-luring material capable of easily propagating undersea plants, such as zostera marina, at a low cost, by fishing with ground baits, and further capable of improving the undersea environment so as to accelerate increase of aquatic organisms. <P>SOLUTION: This fish-luring material contains at least undersea plant propagules. When the fish-luring material thus prepared is used in fishing, such as angling, the undersea plant propagules are underseas seeded together with the ground baits, then spontaneously descend, and land on the seabed. Soon, the undersea plant propagules germinate and grow so as to raise the aquatic organisms and further to create seaweed beds which improve the undersea environment. Further, the undersea plant propagules are coated with a soil conditioner, so that a specific gravity, weight, and critical Shields number of the undersea plant propagules are increased. Therefore, the propagules descend at a high sedimentation velocity and are easily buried in the seabed, and further the coated soil conditioner is changed into a base for growing the plants and a fertilizer so as to make the undersea plants stably germinate and grow. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fish collecting material.

[0002]

2. Description of the Related Art Marine sandstones such as eelgrass and duck, and seaweeds such as kelp and seaweed flourish on the seabed of sand mud with a depth of 0 to 10 m in coastal areas centering on the inner bays of various parts of Japan. . The colony of these marine plants is commonly called the seaweed bed,
Since it serves as a breeding ground for adult fish as well as spawning grounds for various types of seafood, it plays an important role as a fishing ground and a reproduction ground for aquatic products.

[0003] As one type of fishing which is one of the methods for obtaining the aquatic product cultivated in this way, there is a method in which a fish collecting material is sprinkled and the place where the fish has gathered is caught. The fish-collecting materials used for fishing are usually called "sprinkle bait (comasses)",
Frozen fish, frozen krill, minced sardines, etc.,
Alternatively, starchy materials such as sweet potatoes, mashed potatoes, okara, etc., red clay, pupa flour, etc. are used as the main materials, and a mixture of them is used according to the taste of various fishes.

[0004]

[Problems to be Solved by the Invention] However, the increase in landfill work in recent years and the water quality and bottom sediment pollution caused by daily life and factory drainage,
The growth environment of marine plants is deteriorated by the outflow of sand due to the change of drift sand, and its area and density are decreasing nationwide, which is one of the causes of the sea erosion due to the decrease of catch and the outflow of sand.

Therefore, many methods have been proposed for artificially constructing seaweed beds as a means for improving the fish farm and natural recovery, such as directly transplanting the cultivated eelgrass strains to the seabed by a diver. There was a problem in terms of cost because it became a large-scale one.

On the other hand, conventionally used krill, etc.
The sprinkling bait consisting of small organisms is basically a bait mainly composed of organic matter, and if the sprinkling bait is administered in large amounts concentrated in a part of the sea such as a fishing spot, there is a risk of marine pollution. In particular, it has been pointed out that the oil contained in the organic matter settles on the seabed near the coast, which causes environmental damage to the ocean.
In addition, since it is difficult to preserve the sprinkled bait such as krill, the remaining sprinkled bait is often thrown into the fishing ground, which is a factor that spoils the environmental destruction.

The present invention has been made in consideration of the above matters, and by performing fishing using a fish collecting material, it is possible to easily reproduce marine plants such as eelgrass at a low cost. At the same time, it aims to provide a fish collecting material that improves the undersea environment and promotes the increase of aquatic products.

[0008]

That is, the fish collecting material according to the present invention is characterized in that it contains at least a breeding body of marine plants such as eelgrass.

[0009] According to the above structure, a propagating body of marine plants (hereinafter simply referred to as a propagating body), that is, a natural propagating body such as seeds, rhizomes and spores, an artificial propagating body produced from embryonic cells, etc. The fish is thrown by the angler along with the bait, and it naturally sinks to the seabed and reaches the bottom.

Then, in time, it will sprout and grow on the ground to form a seaweed bed and grow further aquatic products.

According to the above method, the breeder is sown by an angler, and a seaweed bed can be constructed without requiring special construction or labor costs. Also, an angler can enjoy fishing without worrying about the environmental degradation caused by using the bait.

Since marine plants, especially marine flowering plants, have an action of absorbing nutrient salts from seawater and seabed sand and mud, even if surplus fish material is used, it will be decomposed and absorbed, resulting in abundance. This will prevent the deterioration of the marine environment such as nutrition.

It is also possible to use a marine plant growing material in which the propagation material is coated with a covering material (claim 2). In such a case, the weight of the covering material is added to cause sedimentation more quickly, resulting in an error. Less likely to be eaten by aquatic products. In addition, since the reproductive bodies settle in the immediate vicinity of the throwing place, they can be sown at a desired growing place. Furthermore, since the coated portion serves as a growth base and fertilizer for marine plants, both the germination rate and growth ability are improved, which is preferable.

Further, the limit shields number is larger than that of the breeding body alone, and the stability against waves is higher than that of the sand and mud forming the seabed. As a result, the breeding body is likely to be buried in the seabed, and an environment where marine plants can easily grow can be prepared.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a method of using the fish collecting material according to the present invention.

The fish collecting material 1 is composed of a breeding body 3 of a marine plant 2 and a sprinkling bait 4 which are substantially uniformly kneaded. The marine plants 2 referred to here are, for example, marine flowering plants proliferated by seeds, such as eelgrass plants such as eelgrass and koalas, Cionillaceae plants such as veneer eels and Ryukyu eelgrass, and Larvae family such as Umihilmo and Ryukyusugamo. It also refers to all plants that grow in the sea such as seaweed such as kelp and seaweed.

As the sprinkling bait 4, the shrimp system such as tiger shrimp and krill, the shrimp system such as white shrimp and bush shrimp, the pupa system such as minced minced and pupa powder, the fish meat such as sardine minced and chinenago, the sprinkled bait such as okara and bread crumbs. It is composed of the base material, etc., and is mixed in an appropriate combination according to the target fish species. The present invention is not limited to the above example, and can be applied to all the sowing baits 4 used in fishing and aquaculture.

Before use, the breeding body 3 and the sprinkle bait 4 are first prepared.
Scoop up the fish-collecting material 1 that has been kneaded with a scoop and throw it to the target point on the sea S. After entering the sea, the fish collecting material 1 is separated and dispersed due to the difference in specific gravity of each component.

At this time, since the reproductive body 1 has a larger specific gravity than seawater, the reproductive body 1 naturally sinks to the seabed A and reaches the bottom. Then, a new aquatic product 5 that sprouted and grew in the area eventually
To form a seaweed bed that will be used as a fishing ground and a reproduction ground.

The formed seaweed bed decomposes and absorbs nutrient salts from the seawater and the seabed A, and prevents deterioration of the marine environment such as eutrophication in the sea due to overspreading of the sprinkling bait 4. Of.

The above-mentioned various seeds can be used as the above-mentioned marine plants 2. For example, seeds originally native to the place of use such as eelgrass in the Chugoku region and Ryukyu eelgrass in the Okinawa area are used. Then, it is preferable because it does not disturb the marine ecosystem.

The sprinkling bait 4 can be applied to any one as described above, but it is preferable to use a component that is decomposed under natural conditions.

FIG. 2 shows an underwater plant growing material 6. This undersea plant growing material 6 is obtained by covering one or a plurality of breeding bodies 3 with a covering material 7 and solidifying it.

As the covering material 7, sand mud 8 as in the seabed A
, And the mixture of fertilizer 9 coated with biodegradable resin is used, but the mixture is not limited to this, and soil-improving materials such as organic bark and peat moss can be used as needed. May be added. Further, as the fertilizer 9, it is possible to select other slow-acting or fast-acting fertilizer such as a super slow-acting fertilizer. In addition, the so-called soil improving material here means a material that improves the physical and chemical properties and the microbial properties of the soil for the purpose of enhancing fertility and productivity of the soil. To do.

Then, one or a plurality of breeding bodies 3 are covered with the above covering material 7 and solidified by an appropriate method such as compression forming or biodegradable resin coating to construct the undersea plant growing material 6. is there.

According to the above-mentioned submerged plant growing material 6, since the specific gravity and the weight thereof are larger than the propagating body 3 alone, the sedimentation speed is increased and the fish are less likely to be eaten by mistake.
Moreover, since it sinks relatively just below the throwing point, it is possible to sow the desired growing point.

Further, since it is easy to be buried in the seabed A, it is stable,
Since the covered portion of the breeding body 3 serves as a growth base and a fertilizer, the germination rate of the breeding body 3 can be improved.

The size of the submerged plant growing material 6 can be set appropriately, but the maximum diameter in plan view is preferably 0.2.
It is effective from the standpoint of handling and the bottoming situation when it is set to 20 to 20 cm, more preferably 0.5 to 5 cm.

The shape can be appropriately selected from spherical, chestnut-shaped, polygonal, plate-shaped, disk-shaped, etc., but a shape with a large bottom shear stress or bottom friction velocity, for example, a substantially rectangular parallelepiped, is used as a submerged plant growing material. Set the limit shields number of 6 to 0.
It is desirable that it be 12 or more, and more preferably 0.3 or more.

Here, the Seals number is generally used as an index indicating the stability of the seabed A against waves and the like, but in the case of fine sand 10, the movement limit shields number (below which sand does not move) is 0. It is supposed to be about 11.

One of the conditions for burying an object in sand is that the buried object has a greater resistance to movement than sand. That is, although the sand around the object moves to some extent, the object is buried in the sand under the condition that the object does not move.

Therefore, as shown in FIG. 3, when the limit shields number of the undersea plant growing material 6 is made larger than that of the fine sand 10, the sea area where the sand is moved appropriately (the Seals number is 0.11).
It is easier to adjust the burial conditions in the
The breeding body 3 can be buried in the seabed A to create a stable germination situation.

[0033]

As described above, according to the present invention,
In a fish collecting material used for fishing or fishery, by mixing at least a propagating body of a marine plant, a seaweed bed can be formed at low cost, which can contribute to improvement of the marine environment.

Further, by coating the periphery of the propagule of the undersea plant with a covering material, the specific gravity, weight and limit number of seals are increased, whereby the sedimentation speed is improved and the seabed is easily buried and further coated. Since the part serves as the growth base and fertilizer for the plant, it is possible to stably germinate the undersea plant.

[Brief description of drawings]

FIG. 1 is an overall view showing a first embodiment of the present invention.

FIG. 2A is a perspective view showing a second embodiment of the present invention. (B) is a sectional view showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a burying process on the seabed according to the second invention.

[Explanation of code] 1 ... fish collecting material, 2 ... underwater plant, 3 ... breeding body, 4 ... sprinkling bait,
5 ... Aquatic products, 6 ... Marine plant growing material, 7 ... Soil improving material,
8 ... sand mud, 9 ... fertilizer, 10 ... fine sand, S ... sea, A ... seabed

Claims (2)

[Claims] 1. A fish collecting material comprising at least a marine plant propagation material. 2. A fish collecting material comprising an underwater plant growing material obtained by coating an underwater plant propagation material with a coating material.