JP2007097549A - Trapping instrument for aquatic organism and method for trapping the aquatic organism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trapping instrument for aquatic organisms, especially effectively trapping apple snails (Pomacea canaliculata), allowing no escape of the trapped apple snails, being not bulky during carrying or preserving the instrument and a method for efficiently trapping aquatic organisms, especially apple snails. <P>SOLUTION: The trapping instrument 1A has a box-shaped housing body 100 made of a synthetic resin and having a rectangular shape in planar view with a bottom plate 130 and opening upward and a cover 110 having through-holes 111 made at two or more sites. The housing body 100 is formed to have a shape spreading to some extent upward from the bottom. Inlets 120 are laterally formed on side walls to be parallely arranged in the longitudinal and short side directions of the housing body 100. Inside of each inlet 120 of the housing body 100, door sheets 122, 123 in the long side and the short side are fixed by bringing their lower edges to be parallel with the lower edge of the inlet 120 with an 8 mm space which constitutes a space 121. The space 121 is installed to each of the inlets 120. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an aquatic organism capture device and an aquatic organism capture method. More specifically, the present invention relates to a catching device that can efficiently capture aquatic organisms, particularly Sukurimaigai, and is not bulky during transportation or storage, and an efficient capturing method using the habits of aquatic organisms.

In recent years, damage to rice seedlings by scallops has become a problem.
Sukuringogai (popular name: Jumbotanishi) is a freshwater snail from the South American family of apple oysters imported for food, characterized by vigorous appetite and strong fertility. At present, the scallop apple mussels that have escaped or discarded from the farm have become wild and are widely distributed throughout Japan, especially in western Japan.
In addition, although there is also information that apple mussels other than Sukuri Apple Guy have been imported for food and have been confirmed in various places, in this specification, those having the same shape and ecology are collectively referred to as Sukuri Apple Guy.

By the way, this scallop apple oyster is omnivorous, but mainly eats vegetable food and likes soft grass. In addition, because they are basically aquatic organisms, paddy fields and their vicinity are often used as habitats in Japan. Due to the food habits and environment described above, rice seedlings immediately after germination in the flooded direct sowing cultivation method are often subject to damage, and serious damage has occurred particularly in western Japan.
Therefore, as a tool for capturing Sukuringingaigai, a capturing tool as shown in the following Patent Document 1 and Patent Document 2 has been proposed.
Japanese Utility Model Sho 63-18062 Utility Model Registration No. 3070748

The capture device according to Patent Document 1 was formed so that the capture target attracted by the smell of food fell from the upper opening to the inside of the capture device, and then the capture target could not escape from the capture device inside. It is characterized by.
However, when the trap according to Patent Document 1 is submerged in water, it has a lung-like organ, although it will fall into the trap once, so it stretches the respiratory tract above the water surface and directly sucks air to the water surface There is a problem that it can't be captured.

Moreover, the catching tool according to Patent Document 2 includes a door that is provided with a horizontal shaft on the upper side of the net cage and pivots about the horizontal shaft, and the door contacts the bottom while being inclined inward. It is formed as described above.
However, the trap according to Patent Document 2 has a structure in which, when a plurality of traps are stacked, the bottom of the trap that is stacked on top is caught on the door of the trap that is positioned below and stacked on top. The bottom of the catch does not reach the inner bottom of the catch located below, and many numbers cannot be stacked. For this reason, when installing a trapping device in a paddy field, there was a problem that only a small number could be carried at a time and work efficiency was poor.
Further, for the same reason, there is a problem that a storage place corresponding to the quantity of the capture tool is required when storing the capture tool.

The present inventor is engaged in agriculture in Kumamoto Prefecture, where there are many reports of damage to scallop apple mussels, and they actually captured scallop apple mussels and conducted various experiments and observations on their ecology. As a result, the present inventor, when entering the gap, hole, etc., the inventor first detects the location and size of the approach path by a sensory device (hereinafter referred to as “tactile device”) that is seen as a tactile device in the head. After that, it was found that there is a habit of entering with the head inserted.
As a result of researches on the structure of a trap that can effectively and surely capture the mussels, the present inventor has arrived at the present invention. At the same time, the present inventor has also come up with an idea that can improve the working efficiency when installing the capture tool in the paddy field.

(Object of invention)
Accordingly, an object of the present invention is to provide a catcher for aquatic organisms, which can efficiently capture aquatic organisms, particularly scallop apple mussels, and does not let the captured scallop apple mussels escape.
Another object of the present invention is to provide a catcher for aquatic organisms that is not bulky during transportation or storage.
Furthermore, it is an object of the present invention to provide a method for capturing aquatic organisms capable of efficiently capturing aquatic organisms, particularly scallops.

The means of the present invention taken to achieve the above object are as follows.
In the first invention,
An aquatic creature catcher,
The closing flap or door disposed at the entrance of the aquatic organism is configured to have a non-closed portion at a required position of the entrance when the entrance is closed,
It is structured so that the captured aquatic organisms can enter the capturing device by pushing open the closing flap or door from the non-closed point,
It is a catcher of aquatic creatures.

In the second invention,
It is characterized in that it is formed in a shape that can be overlapped by fitting one catching tool into the other catching tool,
It is the aquatic organism capture device which concerns on 1st invention.

In the third invention,
It has air permeability and has a lid that can be opened and closed,
It is the aquatic organism capture device which concerns on 1st or 2nd invention.

In the fourth invention,
The entrance is formed on the omnidirectional side wall,
It is the aquatic organism capture device which concerns on 1st, 2nd or 3rd invention.

In the fifth invention,
It is provided with means for holding or fixing the capture device at the installation location,
It is the aquatic organism capture device which concerns on 1st, 2nd, 3rd or 4th invention.

In the sixth invention,
A trap for aquatic organisms, which has a closing flap or door at the entrance, and is configured to prevent it from exiting when the organism to be captured enters from the entrance, is provided between a rice seedling and a paddle or / and rice. It is characterized by being installed at any place between the seedlings,
This is a method for capturing aquatic organisms.

  As the “flap or door”, for example, a flexible or elastic synthetic resin sheet is preferably used, but the sheet is not limited to this, and a plate-like body such as a synthetic resin or metal formed in a mesh shape. For example, the plate-like body or the like may be urged toward the outside of the catching tool to such an extent that the finger can move.

  The “non-closed portion” is, for example, a gap formed by an entrance and a flap or a door, and may be formed so as to cover the entire height direction or width direction, or the height direction or width. It may be formed in a part of the direction.

  Examples of the “means for holding or fixing the capture tool at the installation location” include, but are not limited to, a protrusion formed below the capture tool, and a pile-shaped object is provided on the capture tool. Or what attaches a capture tool to an installation thing etc. may be sufficient.

“Between rice seedling and straw or / and between rice seedling” may be either “gap between rice seedling and straw” or “between rice seedling” or “between rice seedling and straw” The term “gap” and “between rice seedlings” are sometimes used.
Not only rice seedlings, but also lotus roots, colours, grasses, potatoes, etc. are also subject to damage by the scallop apple mussel. For this reason, also in the cultivation place of the said crop, you may use the capture tool which concerns on this invention, or may implement the capture method which concerns on this invention.

(Work)
The operation of the aquatic organism trapping tool (hereinafter referred to as “capturing tool”) according to the present invention will be described. In addition, in description, the case of Sukuringa Guy will be described as an organism to be captured by the capture tool.
First, a trap is placed between the paddy rice seedling and the paddy or / and the rice seedling. At this time, what is formed in a shape that allows one catcher to be fitted and stacked on the other catcher is not bulky, so work when transporting it from a storage place or a transportation means such as a vehicle to a paddy field Efficiency is good.

Prior to installation, put Sukuringaigai inside the trap and cover it.
And the bottom part of a trap is installed on the mud in a paddy field, and it installs so that the entrance lower edge of a trap and the mud upper surface in a paddy field may become the same height or essentially the same height. At this time, it is preferable to install so that the non-closed portion is not buried in the mud.
For those equipped with means for holding or fixing the trapping device at the installation location, install the means using the means.

  After installation, the smell of food in the trap spreads in all directions around the trap of aquatic organisms from the non-closed area, and the scallops attracted by the smell of the bait gather.

  After reaching the entrance of the catcher, the squeaker snail looks for the presence of the approach path with the antenna. And when you find the non-closed part that occurred at the entrance, push the flap or door provided at the entrance from there, or push the flap or door open while pushing the head into the non-closed part, enter in.

  In addition, the spawning season of Sukuringingaigai is summer, and Sukuringingaigai born in the previous year and overwintered has grown to a shell height of 2-3 cm at the time of rice planting. For this reason, the scallops that have entered the shell cannot get out of the way even if they try to get out of the catcher from the non-closed location that is the approach path.

  After installation, collect the traps regularly or by looking at the status of the captured scallops in the traps. The captured scallops will be killed.

(1) According to the present invention, since the entrance has a non-closed portion, aquatic organisms, in particular, scallops, can easily enter the trap, and as a result, it is possible to provide a trap that can be expected to be highly captured. .
(2) Furthermore, the above-mentioned trapping tool, which is formed in a shape that allows one trapping tool to be fitted and stacked on the other trapping tool, can be transported because a plurality of trapping tools can be stacked. Sometimes it is not bulky and the efficiency of the installation work of the trap is improved. In addition, since it is not bulky, it requires less storage space for storage.
(3) If the trap is provided with means for holding or fixing it at the installation location, the trap can be stably installed even in locations where water flows if installed using the means. be able to.
(4) Moreover, since the said capture tool is a simple structure, it can be produced at low cost or can be provided to a consumer at low cost.
(5) According to the capture method of the present invention, the one installed in the gap between the rice seedling and the cocoon can capture the scallop near the cocoon for spawning etc., and the one installed between the rice seedlings is mainly Since it is possible to capture the scallops that eat rice seedlings, the efficiency of the capture work is improved, and as a result, damage to the rice seedlings can be prevented.

The first embodiment of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is an exploded perspective view of a capture tool 1A according to the present invention,
FIG. 2 is a plan view showing a state where food is put in the trap 1A shown in FIG.
FIG. 3 is a front view explanatory view of the trap 1A shown in FIG.
FIG. 4 is a side view explanatory view of the trap 1A shown in FIG.

Please refer to FIG.
The capturing tool 1 </ b> A includes a container 100 having a bottom plate 130 and a lid 110 of the container 100. In the side wall of the container 100, inlets 120 are formed at a plurality of locations. This will be described in detail below.

  The container 100 is a box made of synthetic resin having a rectangular shape in plan view with an upper opening, and the opened portion constitutes an upper opening 103. Further, the upper edge of the container 100 constitutes an opening edge 104. Grip portions 101 and 102 are formed at each edge in the short direction in the opening edge 104. The grips 101 and 102 are located near the center of the opening edge 104 in the short-side direction and are provided to face each other.

  The container 100 is formed so that the four side walls have a shape that slightly expands upward from the bottom (see FIGS. 3 and 4). Specifically, in the present embodiment, the bottom is formed in a longitudinal direction of 300 mm and a lateral direction of 190 mm, and the opening edge 104 is formed in a longitudinal direction of 390 mm and a lateral direction of 270 mm (see FIG. 2). The gripping portions 101 and 102 are formed such that the height to the top surface is 190 mm and the height from the bottom portion to the opening edge portion 104 is 160 mm. However, the container 100 is not limited to the above-described dimensions, and may be set as appropriate depending on the use location and the like.

The upper opening 103 of the container 100 is provided with a detachable lid 110 that is bent so that its peripheral edge is bent downward and can be closed over the peripheral edge 104 of the opening of the container 110. . The lid 110 is provided with a plurality of through-holes 111 formed through the lid 110 from the upper surface to the lower surface (see FIG. 1).
In addition, the lid 110 is formed so as not to leave a gap with the peripheral edge 104 of the opening in order to make it difficult to come off after being closed, and is prevented from falling off by frictional force, but is not limited to this. You may provide a fastener as a prevention means.

A plurality of inlets 120 are formed on the side wall in the longitudinal direction and the short side direction of the container 100. The inlets 120 are provided at seven places on each side wall in the longitudinal direction and at four places on each side wall in the short direction.
Each inlet 120 is a vertically long, substantially rectangular shape having a height of 40 mm and a width of 30 mm, and its lower edge is substantially in contact with the peripheral edge of the bottom plate 130 and its upper edge is formed in a semicircular arc shape. The respective inlets 120 are arranged in parallel in the horizontal direction, and the partitioning portion 124 is configured with an interval of 10 mm between the adjacent inlets 120.

Inside the container 100 and in the vicinity of each inlet 120, a longitudinal door sheet 122 is provided at the longitudinal inlet 120, and a short door sheet 123 is provided at the transverse inlet 120, respectively. The upper part is fixed inside the container 100.
The long side door sheet 122 and the short side door sheet 123 are formed of a sheet of flexible or elastic synthetic resin film, and the long side door sheet 122 is formed in a length of 75 mm and a width of 280 mm, The short side door sheet 123 is formed in a length of 75 mm and a width of 160 mm.

The long side door sheet 122 and the short side door sheet 123 are formed with cuts in the vertical direction every 40 mm in width, leaving a part of the upper side.
The door sheet 122 on the long side and the door sheet 123 on the short side are arranged and fixed so that the cuts are positioned approximately in the middle of the respective partition portions 124. In addition, the shape of a door sheet | seat is not limited to this Embodiment, For example, you may provide the door sheet | seat for every entrance.

  The long side door sheet 122 and the short side door sheet 123 are fixed so that the lower edge thereof and the lower edge of each inlet 120 are parallel to each other with an interval of 8 mm. This portion constitutes the gap 121. The gap 121 is provided at each inlet 120.

  According to the research of the present inventor, when entering a gap, a hole, or the like, a squeaker apple first searches for the location and size of the approach path with a tactile device, and then inserts the head to enter. For this reason, if the width of the gap is less than 5 mm, it will be difficult for scallops to enter, and if it exceeds 10 mm, the scallops will escape by opening the door member from the inside of the container, so that the gap is between 5 mm and 10 mm. Those are preferred. More preferably, the width of the gap is not less than 6 mm and not more than 9 mm, and more preferably not less than 7 mm and not more than 9 mm, from the viewpoint of easy spread of the odor of food, easy invasion of scallops, and prevention of escape. is there.

  The inner bottom portion of the container 100 constitutes a bottom plate 130. The bottom plate 130 is provided with a plurality of drain holes 131 formed so as to penetrate from the upper surface to the lower surface.

(Work)
FIG. 5 is an explanatory diagram of a use state showing a state where the capture tool 1A is installed in a paddy field.
FIG. 6 is an explanatory view showing a bird's-eye view of a state where the capture tool 1A is installed in a paddy field.
With reference to FIG. 1 thru | or FIG. 6, the effect | action of 1 A of capture tools is demonstrated.

  Please refer to FIG. As a preparation for installing the catching tool 1A, the attracting bait 140 is placed at a substantially central portion of the bottom plate 130 of the container 100, and the lid 110 is closed. Examples of the attracting bait 140 include those preferred by scallops such as Chinese cabbage, potato skin, watermelon skin, cucumber, rape leaves and other vegetable scraps.

Please refer to FIG. 5 and FIG. The trap 1A having been prepared as described above is placed in the paddy field 3 and installed so that the lower edge of the entrance 120 of the trap 1A and the surface of the mud 2 of the paddy field 3 have the same or substantially the same height. At this time, the gap 121 is installed so as not to be buried in mud.
As an installation place, the space between each rice seedling 5 is effective, but generally, the scallop apple mussels that inhabit the paddy field tend to lay eggs on the grass at the edge of the paddy field. It is effective to install the capture tool 1A in (See Figure 6)
In addition, although there is a theory that Sukuringingai is nocturnal, the present inventors have observed that Sukuringingai is not particularly nocturnal and is active day and night. Therefore, the time for installing the capture tool 1A may be any time.
Moreover, when installing in the place with the flow of water, you may place weights, such as a stone, on the lid | cover 110 so that the capture tool 1 may flow and not move.

  Late spring to early summer are effective for using the trap 1A. The through-hole 111 provided in the lid 110 alleviates an increase in temperature in the installed trap 1A, and prepares an environment in which the scallop apple guy 4 can easily enter.

  After installation, the smell of the attracting bait 140 in the container 100 spreads in all directions around the trap 1A from the gap 121 generated at the entrance 120. Sukuringai guy 4 who has been attracted by the smell of the attracting bait 140 and has reached the entrance 120 of the trap 1A first searches for its approach path with a tactile device. When the gap 121 formed at the entrance 120 is found, the long side door sheet 122 and the short side door sheet 123 (the short side door sheet 123 in FIG. 5) are pushed open while the head is pushed into the gap 121. , Enters the container 100.

  In addition, as mentioned above, Sukuringa Guy 4 has grown to a shell height of 2-3 cm at the time of rice planting. For this reason, even if the scallop apple guy 4 in the container 100 tries to escape from the gap 121 formed at the entrance 120, the shell of the scallop apple guy 4 is caught by the door sheet 122 on the long side and the door sheet 123 on the short side. And the part which contact | abutted to the partition part 124 among the door sheet 122 of the long side and the door sheet 123 of the short side hits the partition part 124 inside the container 100, and becomes resistance. As a result, the door sheet 122 on the long side and the door sheet 123 on the short side do not open outward from the container 100.

From the above structure, even if the scallop apple 4 enters the container 100 and eats the attracting bait 140 or tries to exit the container 100, it cannot return to the outside of the trap 1A again.
Note that it is impossible to climb and escape the inner wall of the container 100 because the upper opening 103 has a lid 110.

After installation, the capturing tool 1A is collected periodically (several days) or by looking at the situation (capture number, etc.) of the scallop 4 captured in the container 100.
At this time, when the catching tool 1 </ b> A is lifted, the water stored inside flows out from the drain hole 131 provided in the bottom plate 130, and the scallop apple guy 4 remains in the container 100.
The captured spider apple guy 4 is killed.

The second embodiment of the present invention will be described in more detail based on the drawings.
FIG. 7 is an explanatory diagram of a use state showing a state where the capture tool 1B according to the present invention is installed in a paddy field.
In addition, since the capture tool 1B has the same structure and operation as the capture tool 1A described above, the description of the overlapping parts will be omitted, and only the different parts will be described. Moreover, the same code | symbol shall be attached | subjected regarding the structural part equivalent to 1 A of capture tools.

  The catching tool 1B is provided with leg portions 105 that project downward from the back surface of the bottom plate 130. The leg portion 105 is provided over the entire circumferential direction along the side wall of the container 100, and has a height of 30 mm and a thickness of 2 mm. Note that the inner space surrounded by the legs 105 constitutes a space 106.

(Work)
With reference to FIG. 7, the effect | action of the capture tool 1B is demonstrated.
Put the pre-prepared trap 1B into the paddy field 3, bury the trap 105 by pressing the leg 105 of the trap 1B against the mud 3, and the bottom edge of the inlet 120 and the surface of the mud 2 of the paddy field 3 are the same or almost the same height. Install to be.
At this time, since the mud 2 enters the space 106 formed inside the leg 105, the leg 105 is sandwiched by the mud 2 from the inside and the outside and fixed to the installation location.

  In addition, in this Embodiment, although the leg part of the capture tool 1B is provided over the perimeter direction along the side wall of the container 100, it is not limited to this, It forms in a part of container. You can also. Moreover, the height and thickness of a leg part are suitably set according to an installation location etc.

  In the region where the inventor resides, the rice seedling 5 on the end side closest to the rice bran 310 is planted with a spacing of 1 scale (about 30 cm). There is a space of one scale. For this reason, although the dimension of capture tool 1A, 1B which concerns on this Embodiment was made into the numerical value suitable for the said installation place, it is not limited to this dimension, Even if it sets to the dimension according to an installation place or a condition Good.

  In the present embodiment, the container 100 according to the traps 1A and 1B is a rectangular box in plan view, but is not limited to this, and is known in the art, such as a triangle, square, circle, or oval in plan view. It may be a box with a shape.

  In the present embodiment, the container 100 according to the capture tool 1A, 1B has a shape in which the four side walls are slightly expanded upward from the bottom, and can be stacked by being vertically fitted, but is not limited thereto. For example, an opening may be provided on the side of the container, and one catching tool may be fitted into the other opening and stacked on the side. In this case, a lid may be provided on the side opening, and an inlet may be formed in the lid.

  In the present embodiment, the container 100 according to the traps 1A and 1B is made of synthetic resin, but is not limited to this. For example, the container 100 is made of wood, bamboo, metal, or a composite material thereof. May be.

  The arrangement position, shape, dimensions, and number of installations of the inlets 120 related to the traps 1A and 1B are not limited to those described in the present embodiment, but depending on the installation environment or the size of the traps 1A and 1B, etc. May be set as appropriate.

  The shape of the door member is not limited to the above embodiment. For example, a part or all of the portion excluding the gap is formed wider than the opening, and the wide portion is the opening inside the container. It may be configured to abut against the edge and stop so as not to open outward from the container, or to open in the left-right direction or the up-down direction, or in the up-down and left-right directions in a double-spread shape.

  The terms and expressions used in the present specification and claims are for illustrative purposes only, and are not intended to be limiting in any way. The features described in the present specification and claims and their terms There is no intention of excluding some equivalent terms and expressions. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

Exploded perspective view of a capture tool 1A according to the present invention. The top view of the state which put the food into 1 A of capture tools shown in FIG. Front view explanatory drawing of 1 A of capture tools shown in FIG. Side view explanatory drawing of the capture tool 1A shown in FIG. Use condition explanatory drawing which shows the state which installed 1 A of capture tools in the paddy field. Explanatory drawing which shows the state which installed 1 A of capture tools in the paddy field in bird's-eye view. Use condition explanatory drawing which shows the state which installed the trap 1B which concerns on this invention in the paddy field.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A Capturing tool 1B Capturing tool 100 Container 101 Grasp part 102 Grasping part 103 Upper opening part 104 Opening edge part 105 Leg part 106 Space part 110 Lid 111 Through-hole 120 Entrance 121 Gap 122 Long side door sheet 123 Short side door sheet Door sheet 124 Partition 130 Bottom plate 131 Drain hole 140 Invitation bait 2 Mud 3 Paddy field 310 畦 4 Sukuri apple guy 5 Rice seedling

Claims (6)

A catcher (1) for aquatic life (4),
The closing flaps or doors (122, 123) arranged at the entrance (120) of the aquatic organism (4) are not closed at the required locations of the entrance (120) in the closed state of the entrance (120). 121), and
Captured aquatic organisms (4) from the non-closed location (121) are configured to push open the closing flaps or doors (122, 123) and enter the capture device (1),
Aquatic creature catcher. It is characterized in that it is formed in a shape that can be overlapped by fitting one catching tool into the other catching tool,
The aquatic organism capture device according to claim 1. It has air permeability and is provided with a lid (110) that can be opened and closed,
The aquatic organism capture device according to claim 1 or 2. The entrance (120) is characterized in that it is formed on the omnidirectional side wall,
The aquatic organism capture device according to claim 1, 2 or 3. It is provided with means for holding or fixing the capture tool (1) at the installation location,
The aquatic organism capture device according to claim 1, 2, 3, or 4. A trap for aquatic organisms, which has a closing flap or door at the entrance, and is configured to prevent it from exiting when the organism to be captured enters from the entrance, is provided between a rice seedling and a paddle or / and rice. It is characterized by being installed at any place between the seedlings,
How to capture aquatic life.

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