JP2015116164A - Fish egg collection tool and fish egg collection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fish egg collection tool and a fish egg collection method which can collect fish eggs efficiently.SOLUTION: A fish egg collection tool 10 comprises: a cylindrical frame body 16 having openings at one end part and the other end part facing the one end part and a communication part 15 on a side wall through which loaches D can pass; and a net body 18 which can be attached to or detached from the frame body 16 and has meshes smaller than the size of eggs of the loaches D, and in which at least a portion of the net body 18 is accommodated inside the frame body 16 so as to form a spawning place for the loaches D inside the frame body 16 in a state of being attached to the frame body 16.

Description

  The present invention relates to a fish egg collecting tool and a fish egg collecting method for collecting fish eggs.

  Conventionally, many types of fish have been cultivated for food, ornamental use, pet use, research use, feed use, and the like.

  For example, Drosophila belongs to the Drosophila family, and in the natural world, it is abundant in paddy fields, wetlands, ponds, and rivulets around these areas, but also in the muddy bottom where the flow from the middle of the river to the downstream, irrigation canals, etc. Inhabit. The loach is omnivorous and mainly eats organic matter and small animals in the mud and sucks them together with the mud, and eats benthic algae, earthworms and chironomid larvae.

  The spawning season of the loach is from April to July, and males during this period have a pair of humps in front of the dorsal fin and near the base. Spawning of loach is carried out at night in waters such as trickles and paddy fields, and at the time of spawning, the male wraps around the female abdomen. Yes. In addition, loach spawns eggs on aquatic plants and rice stocks, but there are many things that leave this area, and spawns so that it spreads on the mud bottom.

  In addition, for example, medaka belongs to the medaka family, and in the natural world, it lives in flocks such as ponds and swamps in plains, as well as paddy fields, waterways, and creeks, and lives in groups. The medaka swims on the surface of the trickle, and mainly eats zooplankton, insects that fall into the trickle, and attached algae, but hardly eats benthic organisms. The laying season of medaka varies from region to region, but from April to October, females swim with their fertilized eggs on their bodies for a while, but eventually attach to aquatic plants.

  By the way, as a technique that can be applied to efficiently recover the eggs of fish such as loach and medaka as described above, Patent Document 1 discloses a mesh on the bottom surface of a water tank having a predetermined width and depth. A plurality of spawning fish nests made of materials with irregular eyes and planted with aquatic plants on one surface at regular intervals, and further separated from the spawning fish nest by a predetermined length Next, sink a bundle of multiple pipes that will be the hiding place for the parent fish, supply clean water using a water supply pipe in the aquarium, release the loach's female parent and male parent in the aquarium and lay eggs The eggs were spawned in the nest for spawning, and then the eggs were hatched while supplying air into the aquarium through the air pipe, and the initial growth was performed for a predetermined period, and the fry was grown to an appropriate size. A spawning breeding method for loach that is later released into the aquaculture pond has been developed. It is.

  By recovering the egg from the spawning nest in this technique, the egg can be recovered relatively efficiently.

  Further, Patent Document 2 discloses a small fish rearing tank for rearing small fish such as medaka and zebrafish for experiment or ornament and collecting eggs, and an upper surface opening for accommodating water and small fish. A water tank main body, a removable partition member provided in a manner that partitions the inside of the water tank main body into a main chamber and an isolation chamber in the length direction, and a bottom plate and a wall plate whose end portions are rotatably connected A small fish provided with a collecting member in which the bottom plate is normally brought into contact with the bottom surface of the aquarium main body and the wall plate is arranged in a manner facing the partition plate, and the bottom plate is adapted to attach the eggs of small fish A small fish spawning collection method using a breeding aquarium is disclosed.

JP-A-5-336860 JP 2009-261338 A

  However, the techniques disclosed in Patent Document 1 and Patent Document 2 are both premised on spawning fish in the aquarium with respect to the target fish. There is a problem that eggs are not necessarily efficiently recovered as a result. Note that this problem is not limited to the loach and medaka described above, but may also occur in other fish such as carp and crucian carp.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fish egg collection tool and a fish egg collection method that can efficiently collect eggs.

  In order to achieve the above object, the fish egg recovery tool of the present invention has an opening at one end and the other end opposite to the one end, and the fish to be recovered from the egg can pass through the side wall. A cylindrical frame having a communication portion; a mesh that is detachable from the frame and has a mesh smaller than the size of the fish egg; and is attached to the frame, And a net that is at least partially housed inside the frame so as to form a spawning place for the fish.

  According to the fish egg recovery tool of the present invention, a cylinder having an opening at one end and the other end opposite to the one end, and a communication portion through which a fish to be recovered from eggs can pass on the side wall. The fish frame has a mesh that is detachable from the frame body and smaller than the size of the fish egg, and is attached to the frame body and lays the fish inside the frame body. A net that is at least partially housed inside the frame is mounted so as to form a place.

  The fish egg collection tool as described above can be used not only in aquarium, but also in the natural world where eggs to be collected such as paddy fields and wetlands inhabit and spawn. Can lay eggs efficiently. As a result, the fish egg recovery tool according to the present invention can recover eggs more efficiently than the technique of laying eggs using a water tank and recovering them.

  Moreover, the fish egg collection tool which concerns on this invention is equipped with the communication part through which the frame can pass the fish used as the collection | recovery object of an egg on the side wall. For this reason, by installing the fish egg recovery tool according to the present invention in a water area such as a paddy field in a state where at least a part of the communication part is located below the water surface, the fish can easily enter the inside of the frame. Therefore, as a result, the eggs can be collected more efficiently than in the case where the communication portion of the present invention is not provided.

  Further, the fish egg collecting tool according to the present invention forms a spawning place for the fish inside the frame in a state where the mesh having a mesh smaller than the size of the fish egg is attached to the frame. At least a part of the frame is housed inside the frame. For this reason, since the eggs laid in the laying place by fish are captured by the net of the present invention, the eggs can be collected more efficiently compared to the technique not using the net of the present invention.

  Furthermore, since the fish egg recovery tool according to the present invention can recover the eggs by removing the net body from the frame body in a state where the eggs are captured, the net body and the frame body are integrally configured. Compared to the case, eggs can be collected more efficiently.

  As described above, according to the fish egg recovery tool of the present invention, the communicating portion that has the opening at one end and the other end opposite to the one end, and through which the fish to be recovered can be passed on the side wall. A cylindrical frame having a mesh that is detachable from the frame and has a mesh smaller than the size of the fish egg, and is attached to the frame, And a net that is at least partially housed inside the frame so as to form a spawning place for the fish, so that eggs can be collected more efficiently than when the present invention is not applied. can do.

  In the present invention, in a state where the mesh body is attached to the frame body, the opening portion at one end portion and the opening portion at the other end portion of the frame body are partitioned or the opening portion at the one end portion. Or you may accommodate in the inside of the said frame so that the opening part of an other end part may be covered from an inner side. As a result, the eggs laid are completely captured by the net of the present invention. As a result, the eggs can be collected more efficiently than in the technique not using the net of the present invention.

  Moreover, this invention may have a part which a peripheral edge part is located outside the said frame, when the said net is accommodated in the inside of the said frame. Thereby, as a result of being able to remove the said mesh body from a frame body in the state which hold | gripped the said peripheral edge part of a mesh body, an egg can be collect | recovered more easily.

  In particular, according to the present invention, the frame body is made of a material that floats on water, and in a state where the fish is installed in a water area where eggs can be laid, at least the communication part is located at a portion located below the water surface of the side wall. A part may be provided. Thereby, as a result of performing the operation | work which collect | recovers eggs in the state which the frame floated on water, an egg can be collect | recovered more efficiently.

  The present invention may further include a holding member that holds aquatic plants for spawning the fish at a spawning place formed by the net body in a state where the net body is housed inside the frame body. Good. As a result, it is possible to create an environment in which it is easy for eggs to lay eggs. As a result, a larger amount of eggs can be laid, and as a result, eggs can be collected more efficiently.

  In particular, in the present invention, at least one of the frame body and the net body may be colored in the same system color as the aquatic plants. This also makes it possible to create an environment in which fish can easily lay eggs, so that eggs can be collected more efficiently.

  Further, in the present invention, the fish may be loach. As a result, the eggs spawned by the loach inside the frame so as to spread on the mud bottom can be collected by the net, and as a result, the eggs can be collected more efficiently than when the present invention is applied to other fish. The effect that can be enjoyed can be enjoyed more.

  On the other hand, in order to achieve the above object, the fish egg recovery method of the present invention has an opening at one end and the other end facing the one end in a water area where the fish to be recovered can lay eggs. Having a tubular frame provided with a communication part through which the fish can pass on the side wall, so that at least a part of the communication part is located below the water surface, and detachable from the frame, And having a mesh smaller than the size of the fish egg and being attached to the frame, at least part of the fish is laid in the frame so as to form a spawning place for the fish. A net body to be stored is attached to the frame body, and after the eggs are laid by the fish inside the frame body, the net body is removed from the frame body and the eggs captured by the net body are removed. It is to be collected.

  Therefore, according to the fish egg recovery method of the present invention, it operates in the same manner as the fish egg recovery tool of the present invention. Therefore, as in the case of the fish egg recovery tool, compared to the case where the present invention is not applied, the eggs are efficiently processed. Can be recovered.

  According to the fish egg collection tool and the fish egg collection method of the present invention, an effect is obtained that eggs can be collected more efficiently than when the present invention is not applied.

It is a top view which shows an example of a structure of the fish egg collection | recovery tool which concerns on embodiment. It is a side view which shows an example of a structure of the fish egg collection | recovery tool which concerns on embodiment. It is side surface sectional drawing which shows an example of a structure of the fish egg collection | recovery tool which concerns on embodiment. It is a perspective view with which it uses for description of the component of the frame which concerns on embodiment. It is a principal part perspective view with which it uses for description of the frame and net | network body which concern on embodiment. It is a figure which shows an example of a structure of the net | network body which concerns on embodiment, (A) is a top view, (B) is a side view. It is a principal part side view with which it uses for description of the net | network body which concerns on embodiment. It is a flowchart which shows the flow of an operation | work of the fish egg collection method which concerns on embodiment. It is a side view which shows the other structural example of the frame which concerns on embodiment. It is a side view which shows the other structural example of the communication part which concerns on embodiment. It is a principal part top view which shows the other structural example of the net | network body which concerns on embodiment. It is a principal part side view with which it uses for description of the other structural example of the frame which concerns on embodiment. It is a principal part top view which shows the other structural example of the fish egg collection tool which concerns on embodiment. It is principal part sectional drawing which shows the other structural example of the fish egg collection tool which concerns on embodiment. It is a side view with which it uses for description when growing fish using the fish egg collection | recovery tool which concerns on embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. Here, a case will be described in which the present invention is applied to an idle paddy field (hereinafter also simply referred to as “paddy field”), and a loach is applied as a fish to be collected.

  First, with reference to FIGS. 1-3, the structure of the fish egg collection | recovery tool 10 which concerns on this Embodiment is demonstrated. FIG. 1 is a plan view showing an example of the configuration of the fish egg collecting tool 10 according to the present embodiment. FIG. 2 is a side view of the fish egg collecting tool 10 as seen from the direction of arrow A in FIG. 3 is a cross-sectional view taken along line BB in FIG.

  As shown in FIG. 1 to FIG. 3, the fish egg collecting tool 10 according to the present embodiment has a predetermined first direction (indicated by an arrow a in FIG. 1) at the bottom of a predetermined region of the paddy field 11. Direction) and a second direction (the direction of arrow b in FIG. 1) intersecting the first direction (orthogonal in the present embodiment) with a predetermined interval between them, arranged in a matrix in plan view A plurality of platforms 12 are provided. In addition, in the fish egg collection tool 10 which concerns on this Embodiment, although the brick is applied as the stand 12, it is not restricted to this. For example, as the base 12, a solid material such as a concrete block and other material having resistance to water erosion may be applied. Moreover, as a material of the stand 12, a material that does not float on water is preferable from the viewpoint of workability during installation.

  Moreover, in the fish egg collection tool 10 which concerns on this Embodiment, from the viewpoint of workability | operativity at the time of installation of the fish egg collection tool 10 and collect | recovering eggs as said predetermined area | region, it is on the edge of the paddy field 11. Although the area | region which touches is applied, it is not restricted to this. An arbitrary region of the paddy field 11 may be applied as the predetermined region. Furthermore, in the fish egg recovery tool 10 according to the present embodiment, the direction orthogonal to the first direction is applied as the second direction, but the present invention is not limited to this. As the second direction, any other direction may be applied as long as the direction intersects the first direction.

  On the other hand, the fish egg collecting tool 10 according to the present embodiment has a long shape arranged so as to bridge between the tables 12 for each combination of the tables 12 arranged linearly in the first direction. A plurality of support tubes 14a are provided. Furthermore, the fish egg collecting tool 10 includes a plurality of elongated support tubes 14b arranged on the upper portions of the plurality of support tubes 14a so as to span between the support tubes 14a in the second direction. ing. Here, the support tubes 14a and 14b are fixed by binding the overlapping portions with a string or the like (not shown). In addition, in the fish egg collection | recovery tool 10 which concerns on this Embodiment, although the steel pipe is applied as the support pipes 14a and 14b, it is not restricted to this. For example, a vinyl chloride tube or the like may be applied as the support tubes 14a and 14b. Moreover, as a material of support tube 14a, 14b, the material which does not float on water from a viewpoint of workability | operativity at the time of installation is preferable.

  Further, the fish egg collecting tool 10 according to the present embodiment has an opening at one end and the other end opposed to the one end disposed on the upper portion of the support tube 14b, and the loach D passes through the side wall. Two cylindrical frames 16 having possible communication portions 15 are provided. Here, as shown in FIG. 4 as an example, the frame body 16 according to the present embodiment is a substantially rectangular and flat pair of wood 16a and a length in the short direction longer than the wood 16a. The pair of timbers 16b, each having a substantially rectangular shape and a flat plate shape, are formed by combining the timbers 16a and 16b so as to form the sides of the rectangle in plan view, with the paired timbers facing each other. ing.

  More specifically, each wood 16a has a plurality (two in this embodiment) of convex portions 16a1 at one end, and each wood 16b has a plurality (2 in this embodiment) at one end. ) Convex portion 16b1 is formed. Further, each of the timbers 16a has, at the other end, the same number of the concave parts 16a2 as the convex parts 16b1 that are located at the same height in the height direction as the convex parts 16b1 of the wooden parts 16b and correspond to the convex parts 16b1. Is formed. Furthermore, each wood 16b has the same number of concave portions 16b2 as the convex portions 16a1 at the other end, the height of which is the same as the convex portions 16a1 of the wood 16a and corresponding to the convex portions 16a1. Is formed.

  And the frame 16 which concerns on this Embodiment is engage | inserted by the convex part 16a1 of each timber 16a to the recessed part 16b2 of each timber 16b arrange | positioned adjacently. Further, in the frame body 16 according to the present embodiment, the convex portions 16b1 of the respective wooden pieces 16b are fitted into the concave portions 16a2 of the wooden pieces 16a arranged adjacent to each other. With the above configuration, the frame body 16 according to the present embodiment is formed such that each of the woods 16a and 16b configures each side of the rectangle in plan view.

  Therefore, the frame 16 according to the present embodiment has an upper end portion and a lower end portion that are openings, and is formed in a cylindrical shape having a rectangular shape in plan view. As shown in FIGS. 2 and 3, the frame body 16 has an upper end portion of the wall surface formed by each wood 16 a lower than an upper end portion of the wall surface formed by each wood 16 b. Here, in the frame 16 according to the present embodiment, when the frame 16 is provided in the paddy field 11, the difference in height between the wood 16a and the wood 16b is between the water surface and the upper end of the wood 16a. The difference is that the loach is allowed to pass through. For this reason, the frame 16 is a communication portion 15 through which the loach D is allowed to pass between the timbers 16b and between the water surface and the upper end of each timber 16a. In addition, in the fish egg collection tool 10 according to the present embodiment, the color of the frame body 16 is the same color as the aquatic plant 22 described later (in this embodiment, a green color). Not limited to this, it goes without saying that other colors may be applied as the color of the frame 16.

  On the other hand, the frame body 16 according to the present embodiment has a mesh body having a mesh smaller than the size of the eggs of the loach D (hereinafter referred to as “inner net”) so as to form a spawning place for the loach D within the frame body 16. 18) is provided. Here, the inner net 18 according to the present embodiment is provided on the frame body 16 so as to cover the opening of the lower end portion of the frame body 16 from the inside and along the inner surface of the wall surface of the frame body 16. Yes.

  As shown in FIG. 5, the inner net 18 according to the present embodiment has a peripheral end portion at the upper end portion of each wall surface of the frame body 16 by a plurality of clips 19 such as eyeball clips and turn clips. It is detachably fixed to 16. At this time, the inner net 18 is fixed to the frame 16 by the clip 19 so that a part of the peripheral end of the inner net 18 is located outside the upper end of each wall surface of the frame 16. .

  In the fish egg collecting tool 10 according to the present embodiment, a polypropylene net is applied as the inner net 18, but the present invention is not limited to this. For example, as the inner net 18, a net made of polyester, glass fiber, stainless steel or the like may be applied. Moreover, in the fish egg collection | recovery tool 10 which concerns on this Embodiment, although the rectangle is applied as the shape of the mesh of the inner net 18, it is not restricted to this. For example, a triangle or the like may be applied as the shape of the mesh of the inner net 18, and the shape of the mesh is not limited as long as the egg to be collected has a size that does not leak from the mesh of the inner net 18. Moreover, in the fish egg collection | recovery tool 10 which concerns on this Embodiment, although the clip 19 is applied as a member which fixes the inner net | network 18 to the frame 16, it is not restricted to this. For example, a stapler or the like may be applied as the member to be fixed. Furthermore, in the fish egg recovery tool 10 according to the present embodiment, the color of the inner net 18 is the same system color as the aquatic plant 22 described later (in this embodiment, a green color). Not limited to this, it is needless to say that other colors may be applied as the color of the inner net 18.

  As shown in FIGS. 1 to 3, in the fish egg collecting tool 10 according to the present embodiment, a plurality of pieces tied together with a string 20 in the frame 16 and in an area surrounded by the inner net 18. The aquatic plants 22 are arranged. In addition, the fish egg collecting tool 10 according to the present embodiment includes the aquatic plant holding unit 23 that presses the plurality of aquatic plants 22 arranged inside the frame 16 toward the inner net 18 at the bottom of the frame 16. I have.

  The aquatic plant holding part 23 according to the present embodiment is a long and flat transfer plate 28, and the length (width) of the cross plate 28 in the short direction is substantially the same. And a plate-shaped presser plate 24, and a connecting rod 26 that connects between the transfer plate 28 and the presser plate 24.

  In the aquatic plant holding part 23 according to the present embodiment, the length of the transfer plate 28 in the longitudinal direction is slightly longer than the length of the frame body 16 in the second direction, and the length of the holding plate 24 in the longitudinal direction is The length of the body 16 is slightly shorter than the length in the second direction. Therefore, as shown in FIG. 2 and FIG. 3, the aquatic grass holding portion 23 according to the present embodiment has the holding plate 28 in a state in which both end portions with respect to the longitudinal direction of the transfer plate 28 are placed on the upper surface of the upper end portion of the frame body 16. The lower surface of the plate 24 can press the upper surface of the aquatic plant 22 toward the inner net 18 at the bottom of the frame body 16.

  In the aquatic plant holding part 23 according to the present embodiment, since the connecting rod 26 is movably coupled with a moderate frictional force between the transfer plate 28 and the holding plate 24, each of the plurality of aquatic plants 22 is provided. Each aquatic plant 22 can be urged downward while absorbing the fluctuation in height.

  Furthermore, the fish egg recovery tool 10 according to the present embodiment includes a weight member 30 that is loaded on the upper surface of the transfer plate 28 of the aquatic plant holding part 23. The weight member 30 according to the present embodiment is made of a solid material having a weight capable of sinking the frame body 16 and the aquatic plants 22 in the paddy field 11. Therefore, in the fish egg collecting tool 10 according to the present embodiment, the lower end portion of the frame body 16 is in contact with the upper portion of the support tube 14b and the aquatic plant 22 in a state where the weight member 30 is loaded on the upper surface of the transfer plate 28. The lower surface is in contact with the upper surface of the inner net 18 at the bottom of the frame 16. In the fish egg recovery tool 10 according to the present embodiment, brick is applied as the weight member 30, but the present invention is not limited to this. For example, another solid material such as a concrete block may be applied as the weight member 30.

  On the other hand, the fish egg collecting tool 10 according to the present embodiment has a plurality of meshes smaller than the size of the eggs of the loach D, which are arranged on the support tube 14b around the frame body 16 and are similar to the inner net 18. A set (four sets in this embodiment) of nets (hereinafter referred to as “outer network”) 32 is provided. As shown in FIG. 1, the outer net 32 according to the present embodiment includes one end of a first outer net 32a and the other end of a second outer net 32b having the same shape, material, and dimensions as the first outer net 32a. Are overlapped so that one is on top of the other by a predetermined length.

  Here, the outer network 32 according to the present embodiment will be described in detail with reference to FIGS. 6 and 7. 6A is a plan view of the first outer net 32a (second outer net 32b), and FIG. 6B is a side view of the first outer net 32a (second outer net 32b). is there. FIG. 7 is a side view of the main part of the outer net 32 as seen from the direction of arrow A in FIG.

  As shown in FIG. 6 and FIG. 7, the first outer net 32a according to the present embodiment is long, and long steel bars 32a2 and 32a3 are formed at both ends of the rectangular net 32a1 in the longitudinal direction. It is fixed with a string (not shown). Here, the first outer net 32a according to the present embodiment is arranged such that one steel bar 32a2 hangs down on the side of the support tube 14b, and the steel bar 32a2 serves as a weight for the net 32a1. Yes. The first outer net 32a can easily change the length of the net 32a1 by winding or unwinding the net 32a1 around the other steel bar 32a3. Since the second outer network 32b according to the present embodiment has the same configuration as the first outer network 32a, detailed description thereof is omitted here. Moreover, about the 1st outer net | network 32a and 32b shown in FIG. 1, in order to avoid complication, illustration of the steel bars 32a2, 32a3, 32b2, and 32b3 is abbreviate | omitted.

  Next, with reference to FIG. 8, the flow of work from the preparation stage when collecting fish eggs using the fish egg collecting tool 10 according to the present embodiment to actually collecting eggs will be described. FIG. 8 is a flowchart showing the flow of work performed by the worker who performs the work.

  First, in step 100, as described above, the operator installs the plurality of supports 12 on the bottom of the paddy field 11, and then installs the plurality of support pipes 14 a so as to bridge between the supports 12. A plurality of support tubes 14b are installed above the support tube 14a. In the next step 102, as described above, the worker installs a plurality of (two in the present embodiment) frame 16 on the support tube 14b, and in the next step 104, the worker As described above, after the inner net 18 is mounted inside each frame body 16, the peripheral end portion of the inner net 18 is fixed to the upper end portion of the frame body 16 by a plurality of clips 19. In the present embodiment, the worker attaches the inner net 18 to the frame body 16 after installing the frame body 16 in the paddy field 11. However, the present invention is not limited to this. The frame body 16 may be installed in the paddy field 11 after being attached to the body 16.

  In the next step 106, as described above, the operator installs the plurality of aquatic plants 22 bound by the string 20 in each frame 16 and in the area surrounded by the inner net 18. At 108, as described above, the operator installs the aquatic plant holding portion 23 on each frame 16, and then installs the weight member 30 on the transfer plate 28 of the aquatic plant holding portion 23. Then, in the next step 110, as described above, the worker installs the plurality of outer nets 32 on the upper portion of the support tube 14b in the region outside each frame 16. The operator does not necessarily have to bind the aquatic plants 22 with a string or the like, and may be installed in a state where the individual aquatic plants are scattered.

  In the next step 112, the worker releases a predetermined number of loach D male and female parent fish to the paddy field 11. At this time, the operator may release the parent fish into the area inside each frame 16 or may release the parent fish into any area of the paddy field 11 outside each frame 16. In the present embodiment, as the predetermined number, a larger number (for example, two males and two females per 1 m 2) is applied as the area of the paddy field 11 increases. However, the present invention is not limited to this. Needless to say, the predetermined number may be appropriately set according to the amount of bait D food inhabiting the paddy field 11, the time of release of the loach D, and the like.

  In the next step 114, the worker waits for a predetermined period. In the present embodiment, the worker waits until a predetermined time (for example, 9 o'clock) in the morning on the day after the day on which the operations in steps 100 to 112 are performed. Here, the reason why the worker waits until the morning of the next day is because Dough D often lays eggs from early morning (around dawn) to around 6 am.

  In the next step 116, the worker checks whether or not the loach D eggs are laid on at least one of the inner net 18, the aquatic plants 22, and the outer net 32. Here, if the operator confirms that the egg is laid, the process proceeds to step 118. If the operator cannot confirm that the egg is laid, the process returns to step 114 above. Wait until the predetermined time in the morning again on the next day. In the present embodiment, the worker applies all of the inner net 18, the aquatic plant 22, and the outer net 32 as targets for checking whether or not eggs are laid. However, the present invention is not limited to this. Absent. As the object to be confirmed, any one of the inner net 18, the aquatic plant 22, and the outer net 32 may be applied, or a combination of these two may be applied.

  In step 118, the worker waits for a predetermined period. In the present embodiment, the worker waits until a predetermined time (for example, 16:00) in the evening of the day when it is confirmed that the egg is laid by the operation of step 116. The reason why the worker waits until this time is that the loach D has a habit of resting at the bottom of the paddy field 11 until the evening after laying eggs, and the loach D is not stressed as much as possible. In addition, due to the behavior, there is a low possibility that eggs will be eaten by the parent fish during the waiting period.

  In the next step 120, the operator takes out each first outer net 32 a from the paddy field 11. At this time, when pulling up the first outer net 32a from the water, the worker holds the steel bars 32a2 and 32a3 at both ends of the first outer net 32a and pulls them up obliquely upward. Due to the resistance of the water generated by this, suspended matter such as mud that soars from the bottom of the paddy field 11 due to the behavior of the loach of the loach and other paddy fields 11 and adheres to the first outer net 32a. It drops through the mesh and is removed. Then, the worker removes the steel bars 32a2 and 32a3 from each first outer net 32a, and sways and swings the net portion 32a1 of each first outer net 32a in water of a separately prepared water tank (not shown). Thereby, the egg adhering to the net part 32a1 is detached from the net part 32a1 and collected in the water of the water tank. At this time, a small amount of eggs may remain attached to the net part 32a1, and in this case, the operator submerges the net part 32a1 in the water of the water tank. Further, the worker performs the same work as the first outer net 32a on the second outer net 32b.

  In the next step 122, the operator retreats the weight member 30 from the upper portion of the transfer plate 28, and then takes out the aquatic plant holding portion 23 from each frame body 16. By the work of this step 120, each frame 16 and aquatic plants 22 are in a state of floating in the water of the paddy field 11. Therefore, in the next step 124, the operator moves each frame 16 to the edge of the paddy field 11 while floating in the water. Due to the resistance of the water due to this movement, the suspended matter attached to the inner net 18 falls through the mesh of the inner net 18 and is removed.

  In the next step 126, the operator takes out the aquatic plants 22 from the respective frames 16 and collects the eggs by submerging the aquatic plants 22 in the water of the water tank. Further, the operator removes the clip 19, grasps a portion of the inner net 18 positioned outside the frame body 16, and removes the inner net 18 from each frame body 16. Then, the operator sways and shakes the removed inner net 18 in the water of the water tank. Thereby, the egg adhering to the inner net 18 is separated from the inner net 18 and collected in the water of the water tank. In this case, a small amount of eggs may remain attached to the inner net 18, and in this case, the operator keeps the inner net 18 submerged in the water in the water tank.

  The operator can efficiently collect a large amount of eggs by repeatedly executing the operations of Step 100 to Step 126 in the spawning period of the loach D. In the present embodiment, the case where the loach D is released to the paddy field 11 by the operation of step 112 has been described. It goes without saying that the loach D may not be released.

  As described above in detail, in the present embodiment, the fish egg collecting tool (in this embodiment, the fish egg collecting tool 10) has an opening at one end and the other end facing the one end. A cylindrical frame (in this embodiment) provided with a communication portion (in this embodiment, the communication portion 15) through which the fish (in this embodiment, loach D) that is an egg collection target can pass is provided on the side wall. In this embodiment, the frame 16) is detachably attached to the frame and has a mesh smaller than the size of the fish egg, and is attached to the frame so as to be inside the frame. In order to form a spawning place for the fish, a net body (in this embodiment, net body 18) that is at least partially housed inside the frame body is provided, so that the eggs are efficiently collected. be able to.

  In the present embodiment, the net body is attached to the frame body so as to cover the opening of the other end portion (the lower end portion in the present embodiment) of the frame body from the inside. Since it is housed inside the frame, the eggs laid are completely captured by the net, so that the eggs can be collected more efficiently.

  In the present embodiment, when the mesh body is housed inside the frame body, the peripheral end portion has a portion located outside the frame body. As a result of the net body being able to be removed from the frame body with the end portion being gripped, the eggs can be collected more easily.

  In particular, in the present embodiment, the frame body is made of a material that floats on water (in this embodiment, wood), and in the water area (in this embodiment, paddy field 11) where the fish can lay eggs. As a result of being equipped with at least a part of the communication part in the part located below the water surface of the side wall in the installed state, the result of being able to perform the operation of collecting the eggs in a state where the frame body floats on water, Eggs can be collected more efficiently.

  Further, in the present embodiment, aquatic plants (in this embodiment, aquatic plants) for spawning the fish in the spawning place formed by the net body with the net body housed inside the frame body. 22) is further provided with a holding member (in this embodiment, aquatic plant holding portion 23), so that it is possible to create an environment that makes it easier for fish to lay eggs, so that a larger amount of eggs can be laid, As a result, eggs can be collected more efficiently.

  In particular, in the present embodiment, the frame body and the net body are colored in the same system color as the aquatic plants (in this embodiment, a green system color). As a result, the eggs can be collected more efficiently.

  Further, in the present embodiment, the fish that is the target of egg collection is a loach, and as a result, the eggs spawned by the loach so as to spread on the mud bottom inside the frame body can be collected by the net body. The effect of being able to recover eggs well can be enjoyed more.

  Furthermore, in the present embodiment, since the inner net 18 and the outer net 32 are provided apart from the bottom of the paddy field 11, the suspended matter is less likely to adhere to the inner net 18 and the outer net 32.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the above-described embodiment without departing from the gist of the invention, and embodiments to which such modifications or improvements are added are also included in the technical scope of the present invention.

  The above embodiments do not limit the invention according to the claims (claims), and all the combinations of features described in the embodiments are essential for the solution means of the invention. Is not limited. The embodiments described above include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. Even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, as long as an effect is obtained, a configuration from which these some constituent requirements are deleted can be extracted as an invention.

  For example, in the above embodiment, the case where two frame bodies 16 are provided has been described, but the present invention is not limited to this. For example, a configuration in which one frame body 16 is provided or a configuration in which three or more frame bodies 16 are provided may be used. What is necessary is just to determine suitably according to etc.

  Moreover, although the said embodiment demonstrated the case where the frame 16 was made into the cylindrical shape of a planar view rectangle, this invention is not limited to this. For example, the frame 16 may have a cylindrical shape in a plan view, that is, a cylindrical shape, or may have a cylindrical shape having a triangular shape in a plan view or a pentagon or more.

  Moreover, although the said embodiment demonstrated the case where the shape and dimension of planar view of a lower end part and an upper end part were the same (congruent) as the frame body 16 was demonstrated, this invention is limited to this. It is not a thing. For example, as shown in FIGS. 9A and 9B, the frame 16 has the same shape in plan view at the lower end portion and the upper end portion, and gradually has an area in side view from the lower end portion to the upper end portion. It is good also as a form which applies what becomes small or gradually becomes large. Further, as shown in FIGS. 9C and 9D, as the frame body 16, the shape in plan view of the lower end portion and the upper end portion is the same, and the intermediate portion in side view is the lower end portion and the upper end portion. A configuration in which the area is smaller or larger than that in comparison may be applied. Further, as the frame 16, the opening at the lower end and the opening at the upper end are in a rectangular shape in plan view and the opening in the upper end is circular in plan view. It is good also as a form which applies what differs in a shape.

  Moreover, in the said embodiment, the case where the frame 16 is comprised by using the substantially rectangular shape and flat plate-shaped four timber so that each timber may comprise each side of a planar view rectangle. However, the present invention is not limited to this. For example, the frame 16 may be configured by forming a mold for the frame 16 in advance and molding the frame 16 using a material such as the mold and plastic. In addition, the material of the frame 16 in this case is preferably a material that floats on water, like the frame 16 according to the above embodiment.

  Moreover, in the said embodiment, when the frame 16 is installed in the paddy field 11, the communication part 15 is comprised by comprising the frame 16 so that the upper end part of the timber 16a of the frame 16 may be located under a water surface. Although the case where it provided is demonstrated, this invention is not limited to this. For example, as shown in FIG. 10, when the frame body 16 is installed in the paddy field 11, the frame body 16 is configured such that the upper ends of all the wall surfaces are located on the water surface, and the frame body 16 is positioned below the water surface. It is good also as a form which provides the communication part 15 which can pass the said fish in the one part area | region (area | region near an upper end part as an example).

  Moreover, although the said embodiment demonstrated the case where the inner net | network 18 was provided so that the opening part of the lower end part of the frame 16 might be covered from an inner side, this invention is not limited to this. For example, the inner net 18 may be provided below the communication portion 15 so as to partition between the opening at the upper end portion and the opening at the lower end portion of the frame body 16.

  Moreover, although the said embodiment demonstrated the case where the paddy field 11 was applied as an installation place of the fish egg collection | recovery tool 10, this invention is not limited to this. For example, it is good also as a form which applies the other water area in which the fish which is the collection | recovery object of eggs, such as artificial ponds other than the paddy field 11, natural ponds, etc. can inhabit as an installation place of the fish egg collection tool 10.

  Moreover, although the said embodiment demonstrated the case where the loach D was applied as fish of the object which collects eggs with the fish egg collection | recovery tool 10, this invention is not limited to this. For example, other fishes such as medaka, carp, and crucian may be applied as the fish.

  In the above embodiment, the case where one network is applied as the internal network 18 has been described. However, the present invention is not limited to this. For example, a network formed using a plurality of networks may be applied as the internal network 18. In this case, as the inner net 18, as shown in FIG. 11 as an example, a form in which one end of two nets 18 a and 18 b is joined by a stapler (not shown), an eyeball clip, a turn clip, or the like is exemplified. In this case, it is preferable to provide, as an example, a flat reinforcing plate 50 at the bottom of the frame 16 and below the joints of the nets 18a and 18b for reinforcing the joints.

  Moreover, in the said embodiment, in order to space apart the opening part of the lower end part of the frame 16, ie, the opening part covered from the inner side by the inner net 18, from the bottom of the paddy field 11, the stand 12 and the support pipes 14a and 14b. However, the present invention is not limited to this. For example, as shown in FIG. 12, when the wood 16b of the frame 16 is installed directly on the paddy field 11, the length in the direction of gravity is such that a part of the area including the upper end protrudes above the water surface. It is good also as a form which spaces apart the opening part of the lower end part of the frame 16 from the bottom of a paddy field.

  Moreover, although the said embodiment demonstrated the case where the frame 16 was a cylindrical shape which has an opening part in the other end part which opposes the said one end part and the said one end part, this invention is not limited to this. . For example, as shown in FIG. 13 as an example, the opening at the lower end of the frame 16 is closed with a flat plate, and is formed of a material that floats on the inside of the frame 16 and has an opening at the upper end. A plurality of (four in the example shown in the figure) box bodies 54 having a rectangular shape in plan view may be installed in a matrix in plan view so as to be in contact with each other. In this case, the aquatic plants 22 are disposed inside the box body 54. In this case, as an example, as shown in FIG. 14, a string 56 for holding the aquatic plants 22 may be provided so as to bridge the upper ends of the opposing side walls of the box 54. It is good also as a form which provides the string 58 for gripping when taking out the box 54 from the frame 16 in an outer wall surface.

  Furthermore, although the said embodiment demonstrated the case where the fish egg collection | recovery tool 10 was used only for collect | recovering fish eggs, this invention is not limited to this. For example, the fish egg collection tool 10 may be used to cultivate fish from hatching of some eggs to growth to adult fish, in addition to collecting eggs. In this case, as an example, as shown in FIG. 15, it is preferable to provide a net body 60 having a mesh size large enough to prevent the target fish from passing through the communicating portion 15 of the frame body 16.

  In addition, the structure (refer FIGS. 1-3) of the fish egg collection | recovery tool 10 demonstrated by the said embodiment is an example, and remove | eliminates an unnecessary component within the range which does not deviate from the main point of this invention, Needless to say, new components can be added.

  Furthermore, the flow of work when collecting fish eggs shown in the above embodiment (see FIG. 8) is also an example, and unnecessary steps can be deleted without departing from the gist of the present invention. It goes without saying that new steps can be added or the order of the steps can be changed.

DESCRIPTION OF SYMBOLS 10 Fish egg collection tool 12 stand 14a, 14b Support pipe 15 Communication part 16 Frame 18 Inner net | network (net body)
22 Aquagrass 23 Aquagrass holding part (holding member)
24 Holding plate 26 Connecting rod 28 Transfer plate 30 Weight member 32 Outer mesh D

Claims (7)

A cylindrical frame body having an opening at one end and the other end opposite to the one end, and a communication part through which a fish to be recovered can be passed on the side wall;
The fish has a mesh that is detachable from the frame and smaller than the size of the fish eggs, and forms a spawning place for the fish inside the frame when attached to the frame. A net that is at least partially housed within the frame;
Fish egg collection tool equipped with. The fish egg collection tool according to claim 1, wherein the net has a portion whose peripheral end is located outside the frame when housed in the frame. The frame body is made of a material that floats on water, and includes at least a part of the communication portion in a portion located below the water surface of the side wall in a state where the fish is installed in a water area where eggs can be laid. Item 3. A fish egg recovery tool according to item 1 or item 2. The holding member which hold | maintains the aquatic plant for the said fish to lay eggs in the spawning place formed of the said net body in the state in which the said net body was accommodated in the inside of the said frame body. The fish egg collection tool according to any one of the above. The fish egg collection tool according to claim 4, wherein at least one of the frame and the net is colored in the same color as the aquatic plants. The fish egg recovery tool according to any one of claims 1 to 5, wherein the fish is loach. In a water area where fish to be collected can lay eggs, one end and an opening at the other end opposite to the one end are provided, and a tubular portion provided with a communicating part through which the fish can pass on the side wall A frame is provided so that at least a part of the communication part is located below the water surface,
The fish has a mesh that is detachable from the frame and smaller than the size of the fish eggs, and forms a spawning place for the fish inside the frame when attached to the frame. At least a part of the net housed inside the frame body is attached to the frame body,
A method for recovering fish eggs, wherein after the eggs are laid by the fish inside the frame, the net is removed from the frame and the eggs captured by the net are recovered.