JP2006345804A - Method for rearing firefly larva, feeding container for firefly larva and rearing apparatus for firefly larva - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for rearing firefly larvae with which the firefly larvae can be reared irrespective of a place and a load of tending, etc., can be reduced and to provide a feeding container for the firefly larvae and a rearing apparatus for the firefly larvae. <P>SOLUTION: The method for rearing the firefly larvae comprises housing a feed in a container 10 having an opening 10a, arranging the container in water and supplying the feed to the firefly larvae. Thereby, the spreading of a digestive fluid or the feed to the surroundings is eliminated and defective growth of the firefly larvae or deterioration of water quality is not caused. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for breeding firefly larvae, a feeding container for firefly larvae, and a breeding apparatus for firefly larvae, and more particularly to a breeding technique suitable for breeding firefly larvae with artificial food.

In general, it is known that firefly larvae grow in clear streams and lakes, rise to the land, hatch in the ground, and eventually become adults and appear at high temperatures and humidity at night. As a method of breeding fireflies, a method of actually breeding in a clear stream or a lake, a method of placing a net container etc. in a natural environment such as a clear stream or a lake and breeding it separately from the surroundings, a pseudo A method of breeding in a water tank in which a habitat environment is formed is known (for example, see Patent Documents 1 to 3 below).
Japanese Patent Application No. 2000-157101 Japanese Patent Application No. 2003-23920 Japanese Patent Application No. 2004-222704

  However, the above-described method using the natural environment has a problem that it cannot be raised in a place where there is no natural environment suitable for firefly inhabiting. On the other hand, the method of rearing in the aquarium requires the creation and maintenance of a pseudo-habitat environment, which requires time and labor for the creation of the pseudo-environment and the maintenance and management of water quality. There is a problem that breeding is extremely difficult because it is necessary to obtain or grow a raw food such as kawainina of a size suitable for becoming.

  Therefore, the present invention solves the above-mentioned problems, the problem is that it is possible to breed firefly larvae regardless of the location, and further, a method for raising firefly larvae that can reduce the burden of management, for firefly larvae It is to provide a feeding container and a firefly larva rearing device.

  In view of such circumstances, the present inventor has raised fireflies and made various attempts, and as a result, feeding the firefly larvae by feeding them into an artificial small container, the survival rate and growth rate of the firefly larvae Has been found to be greatly improved.

  According to the knowledge of the present inventor, the method for feeding firefly larvae is to release the digestive fluid into the water, dissolve the food with this digestive fluid, and suck the melted food. When exposed to water, digestive juice and melted food deteriorate the water quality in a short time, and the water becomes cloudy and emits a foul odor. In addition, most of the melted bait will flow into the water, which may hinder the growth of firefly larvae.

  On the other hand, when live kawainina is given as a bait, it is necessary to provide kawainina of a size that matches the growth state of the firefly larvae. can not see. As a result of various investigations of this reason, the present inventor has reached the following conclusions.

  In other words, when the firefly larva finds the kinina, it attaches to the opening of the shell, thrusts its head into the shell, paralyzes the kinina, and then releases the digestive juice. At this time, since the opening of the shell becomes like a plug with many firefly larvae, the digestive juice hardly comes out of the shell, and the firefly larvae are eaten until all of the body of kawainina disappears. Since the digestive juice remaining inside the shell is almost absorbed by the firefly larvae, the surrounding water quality is kept relatively clean.

  The inventor of the present application has arrived at the present invention from the above conclusion. That is, the method for growing firefly larvae of the present invention is to feed the firefly larvae by placing the food in a container having an opening and placing it in water. By doing so, the growth of firefly larvae and the deterioration of water quality are not caused. Specifically, by placing a container containing bait in water, a large number of firefly larvae feed their heads into the container from the opening and plug the opening. At this time, the digestive juice produced by the firefly larva dissolves the food in the container, and the dissolved food is absorbed by the firefly larva in the container. Since the melted bait is held in a container closed by the firefly larvae themselves, the firefly larvae can absorb almost all of the bait, thereby preventing poor growth. In addition, since the digestive juice and dissolved food rarely go out of the container, the surrounding water quality is kept clean.

  In a certain embodiment, the said container is equipped with the accommodation space which one side opens in the said opening part, and the other side is obstruct | occluded. If an accommodation space is formed where one side opens at the opening and the other side closes, a large number of firefly larvae concentrate on the opening, so the opening is closed by a large number of firefly larvae, increasing the feeding efficiency of the firefly larvae. While being able to increase, the leakage of digestive juice can further be reduced.

  In another embodiment, the circular equivalent diameter of the opening is in the range of 3 to 10 mm. The preferred range of the opening area of the opening varies depending on the growth stage of the firefly larvae, but if the diameter of the circle of the opening (the diameter of a circle having an area equal to the opening area of the opening) is in the range of 3 to 10 mm, At any stage, firefly larvae can suppress poor growth and water quality deterioration. However, it is desirable to gradually increase the above-mentioned diameter in terms of circle as the firefly larvae grow. In this case, the circle-converted diameter can be in the range of 1 to 15 mm.

  Furthermore, if all the firefly larvae enter the container, they may not be able to breathe and may suffocate, but even if the firefly larvae thrust their heads into the container, at least the tail may be outside the container. If so, there is no risk of suffocation. This is because the firefly larva respiratory tract is formed in the vicinity of the tail on the side of the body. In this case, the depth of the container that can be suitably fed without suffocation changes depending on the growth stage of the firefly larvae, but in another embodiment, the maximum depth viewed from the opening of the container is 3 to 12 mm. Within the range. This can reduce the risk of suffocation at any stage of firefly larvae. However, it is desirable to gradually increase the maximum depth as the firefly larvae grow. In this case, the maximum depth can be in the range of 1 to 18 mm.

  Next, the feeding container for firefly larvae of the present invention is characterized by comprising an opening and an accommodating space that is open at one side and closed at the other side. In this case, in a certain embodiment, a bait accommodation part is provided in the inner part of the accommodation space, and an inner surface step for holding food is formed on the opening side of the bait accommodation part. By providing a step on the inner surface, the food can be held in the food container, so that movement of the food in the container before and during feeding to the firefly larvae can be prevented. Can be increased.

  In another embodiment, the accommodation space has a shape in which a cross-sectional area gradually decreases from the opening toward the back. In this way, the cross-sectional area of the accommodation space into which the firefly larvae pierce the head gradually decreases toward the back, so that the digestive fluid and bait leakage to the opening side is prevented while the firefly larvae are on the body side. Breathing with a certain respiratory device becomes easy.

  In still another embodiment, the opening has an opening edge shape that is not arranged on the same plane. According to this opening edge shape, since the container is not stable in a posture in which the opening edge is in contact with the water bottom, it is difficult to be placed on the water bottom in a posture with the opening down, and the posture is temporarily down. However, since a gap is easily formed between the bottom of the water and the opening edge, it is possible to feed the firefly larvae through the gap.

  Moreover, in another embodiment, the external shape which gradually reduces cross-sectional area toward the said other side from the said one side is provided. According to this, even when the container is placed in a place where there is a flow, it becomes easier to stand still with the opening facing downstream, and the underwater attitude of the container changes due to predation of larvae, turbulence, etc. Even so, it stops immediately without being washed away, making it easier for the firefly larvae to eat and promoting the growth of the firefly larvae. Here, preferable examples of the outer shape of the container include a conical shape, a truncated cone shape, a truncated pyramid shape, and a truncated pyramid shape.

  In another embodiment, the outer end portion on the other side has a protruding shape. Since the outer end of the other side has a protruding shape, it becomes difficult to stand still in an attitude where the opening faces upward, and it becomes more likely that the opening will stand still in a position where the opening is turned sideways. It becomes easy to do.

  Furthermore, in another embodiment, the outer surface is roughened. When the outer surface of the container is roughened, it becomes easy for the firefly larva to climb up the outer surface of the container and reach the opening even when the opening is facing upward. It becomes easy to do.

  In a further different embodiment, the circular equivalent diameter of the opening is in the range of 3 to 10 mm. In yet another embodiment, the maximum depth seen from the opening is in the range of 3-12 mm.

  Next, a firefly larva breeding apparatus according to the present invention includes the firefly larva feeding container according to any one of the above, and a water tank for housing the firefly larva feeding container. By placing the firefly larva feeding container containing the food in the water in the aquarium, it is possible to easily and effectively feed the firefly larvae, and also suppress deterioration of the water quality. There is no need for frequent replacement.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a feeding container for firefly larvae according to the present invention, FIG. 2 (a) is a longitudinal sectional view of the container, and FIG. 2 (b) is a transverse sectional view.

  The container 10 includes a wall member 11 that defines an opening 10a and a storage space 10b. The wall material 11 can be formed of a synthetic resin such as a fluororesin such as polyethylene, polypropylene, polycarbonate, or tetrafluoroethylene, ceramics, wood, or the like. The accommodation space 10 b has one side opened at the opening 10 a and the other side closed by the outer end 11 a of the wall material 11. The container 10 has a shape in which the cross-sectional area is gradually reduced from the opening 10a on one side toward the outer end 11a on the other side, specifically, a truncated cone shape. The outer end portion 11a has a hemispherical shape.

  The opening edge 11b of the wall material 11 that defines the opening 10a has a shape that is not arranged on the same plane, that is, a shape that cannot assume a single virtual plane including the entire opening edge 11b. Specifically, as shown in FIG. 2A, the opening edge 11b has opening edge portions 11x and 11y respectively disposed on two different virtual planes. The opening edge portion 11x is constituted by a cut face directed obliquely upward in the figure, and the opening edge portion 11y is constituted by a cut face directed obliquely downward in the figure. Thus, the opening edge 11b is configured such that the boundary portion between the opening edge portions 11x and 11y protrudes most and the other portion is concave. However, in the present invention, the shape of the opening edge 11b is not limited in any way, and various shapes other than those illustrated can be adopted including the case where the entire opening edge 11b is arranged on the same plane. As a typical example in which the opening edge 11b is not included on the same plane, there is a structure in which the opening edge 11b is formed in an uneven shape in the circumferential direction.

  The accommodation space 10 b is defined by the opening 10 a and the inner surface of the wall material 11. The accommodation space 10b is formed so that the cross-sectional area gradually decreases from the opening 10a toward the back. In the present embodiment, the wall material 11 gradually increases in thickness from the opening edge 11b of the opening 11a toward the back, and as a result, the change rate of the cross-sectional area of the accommodation space 10b is greater than the change rate of the cross-sectional area of the outer shape. Is also getting bigger. And the food storage part 10c which faces the inner surface level | step difference 11c provided in the opening part 10a side is provided in the back part of the storage space 10b in the part corresponded to the inside of the outer end part 11a. A bait (not shown) is housed in the bait container 10c. The inner surface level difference 11c is provided to hold the food stored in the food storage unit 10c, that is, to prevent the food from moving toward the opening 10a before and during feeding.

  In the present embodiment, the firefly larva can be fed by placing the container 10 containing the food in the food storage unit 10c in water. The container 10 can also be used for feeding firefly larvae in a natural environment, and can also be used for feeding firefly larvae raised in an artificial environment such as a water tank described later. In particular, it can be arranged in a flowing place such as a river.

  When the container 10 is placed in the water, the firefly larva puts its head into the accommodation space 10b through the opening 10a, discharges the digested liquid from the food placed in the food containing part 10c, and dissolves the food with this digested liquid. Liquefy and suck this bait. At this time, a large number of firefly larvae push their heads into the accommodation space 10b from the opening 10a, so that they are plugged by the body of the firefly larvae. Hardly leaks outside. Moreover, since the firefly larvae being eaten have at least a tail outside the opening 10a and can breathe with a plurality of respiratory organs formed up to the tail along the body side, they do not suffocate.

  Also, the firefly larvae have pierced their heads into the container 10 until all of the food has been absorbed, and after the larvae have finished foraging, almost no digestive fluid or food liquid remains in the storage space 10b of the container 10. As a result, the water quality around the container 10 is finally hardly contaminated.

  The opening 10a of the container 10 is basically preferably 3 to 10 mm in terms of a circle equivalent diameter. In this range, no matter what growth stage the firefly larvae are in, they can be eaten and do not cause poor growth of the firefly larvae or deterioration of water quality. However, the growth of the firefly larvae can be further promoted by gradually increasing the size of the opening 10a according to the growth of the firefly larvae. In this case, the circular equivalent diameter of the opening 10a can be in the range of 1 to 15 mm.

  Moreover, it is preferable that the maximum depth (distance from the opening part 10a to the inner part (inner surface part inside an outer end part)) of the container 10 shall be 3-12 mm. In this range, the risk of suffocation can be reduced regardless of the growth stage of the firefly larvae, and sufficient foraging is possible. However, by gradually increasing the maximum depth according to the growth of the firefly larvae, it is possible to eliminate the risk of suffocation of the firefly larvae, facilitate feeding, and promote growth. In this case, the maximum depth can be in the range of 1-18 mm.

  In the container 10 of this embodiment, since the opening 10a has a shape that is not included on the same plane, the opening 10a can be made difficult to be arranged in a posture toward the water bottom, even if the opening 10a is on the water bottom. Even if it is in a facing posture, a gap is formed between the bottom of the water and the opening edge 11b, so that the firefly larva can be easily inserted into the accommodation space 10b.

  Further, since the outer end portion 11a has a protruding shape, the outer end portion 11a is unlikely to face the bottom of the water and the opening portion 10a is difficult to face upward. It is configured to face up. In particular, when the container 10 is viewed in the direction from the opening 10a toward the outer end 11a, the outer end from the opening 10a is larger than the maximum width (the maximum diameter, that is, the diameter of the opening 10a in the illustrated example). Since it has the shape where the length to the part 11a is large, it is comprised easily in the state of lying down at the bottom of the water. In this posture, the opening 10a faces upward so that the firefly larva cannot be inserted into the accommodation space 10b from the opening 10a, and the firefly larva can easily pass through the opening 10a in the accommodation space 10b. You can insert the head into the.

  In the present embodiment, since the cross-sectional area gradually decreases from the opening 10a toward the outer end portion 11a (conical shape, truncated cone shape, truncated pyramid shape, truncated pyramid shape, etc.), Even if it is arranged at a certain location, it is easy to stand still in a posture in which the opening 10a faces the downstream side. That is, it is difficult to be caused to flow downstream by the water flow, and the posture is easily stabilized. This means that foraging is easier for firefly larvae. In particular, firefly larvae may change the posture of the container 10 during foraging, but even if the posture changes, the container 10 immediately stops with the opening 10a facing downstream, so that it does not flow greatly. .

  By the way, when the cross-sectional area does not change from the opening 10a toward the outer end 11a (cylindrical shape, rectangular tube shape, etc.), the direction of the opening 10a is difficult to be determined, and it rotates around the axis line. Rotating in a turning posture, the posture is not stable. In particular, when the opening 10a is directed to the upstream side, the water flow flows into the container 10 and the posture is not further stabilized. Further, if the cross-sectional area is reduced from the outer end portion 11a toward the opening 10a, the opening 10a is easily directed upstream in the water flow, so that the posture is not stabilized by the flow of the water flow. .

  Since the storage space 10b of the container 10 has a shape in which the cross-sectional area decreases from the opening 10a toward the back, when many firefly larvae push their heads into the storage space 10b, the back of the storage space 10b depends on the body of the firefly It becomes easy to close between the side and the opening part 10a side, and the leakage of digestive fluid and a feed solution is further reduced. In addition, when a large number of firefly larvae are foraging, the opening 10a side is widened in the shape of the accommodation space 10b, and a gap is likely to be generated between the tail side portions of the body of many firefly larvae. The risk of suffocation of larvae can be further reduced.

  FIG. 3 is a schematic perspective view showing the structure of another firefly larva feeding container 20. The container 20 has an opening 20a, an accommodation space 20b, a bait accommodation part 20c, a wall member 21, an outer end 21a, and an opening edge 21b. The outer surface and the inner surface of the wall member 21 are basically cylindrical (cylindrical). It differs from the container 10 in that it is configured in a planar shape. Even with this outer shape, there is no problem when feeding in lakes and aquariums with little water flow.

  Moreover, although the opening edge 21b is formed in the substantially circular shape, it differs from the above also in the part 21d spreading in the concave shape to the outer end part 21a side. That is, the opening edge 21b has a portion disposed on the same surface and a portion recessed from the same surface toward the outer end portion 21a. Even in this shape, the opening 20a is unlikely to face the bottom of the water, and even if the opening 20a is directed to the bottom of the water, a gap is formed due to the shape of part 21d, so that the firefly larvae cannot be eaten. Such a situation can be avoided.

  Further, the outer end portion 21a is provided with a tip portion 21e that projects sharply in a conical shape (conical shape). Therefore, there is almost no possibility that the tip portion 21e faces the bottom of the water, so that the firefly larvae cannot insert the head from the opening 20a into the accommodation space 20b with the opening 20a facing upward. Can be further reduced.

  FIG. 4 is a schematic longitudinal sectional view showing the structure of still another feeding container 30 for firefly larvae. The container 30 has an opening 30a, an accommodation space 30b, a bait accommodation part 30c, a wall material 31, an outer end 31a, an opening edge 31b, and an inner surface step 31c corresponding to each part of the above embodiments. In general, it has the same general configuration as described above, but is provided with a protrusion (or protrusion) 31d protruding from a part of the opening 31b and a protrusion (or protrusion) protruding from a substantially flat outer end 31a. Piece) It differs in that 31e is provided.

  Since the protrusion 31d is provided, a part of the opening edge 31b protrudes by the protrusion 31d even if many portions of the opening edge 31b are arranged on the same plane as in the illustrated example. As a result of this structure, the opening 30a is unlikely to face the water bottom, and a gap is always formed between the opening 30a and the water bottom by the protrusion 31d, so that the firefly larvae cannot be eaten. Can be avoided.

  Further, by providing the protrusion 31e, even when the outer end 31a is formed flat as in the illustrated example, the outer end 31a faces the water bottom and the opening 30a faces upward. This can prevent the situation where the firefly larvae cannot be eaten.

  FIG. 5 is a schematic longitudinal sectional view showing the structure of a further different feeding container 40 for firefly larvae. The container 40 has an opening 40a, a storage space 40b, a bait storage 40c, a wall material 41, an outer end 41a, an opening edge 41b, and an inner surface step 41c corresponding to each part of the above embodiments. It differs from each said embodiment by the point by which the opening edge 41b is arrange | positioned on the same surface and the outer end part 41a is formed flat. In this container 40, the outer side surface 41f is roughened, and even if the opening 40a is oriented upward as shown in the drawing, the firefly larvae are likely to crawl up on the outer side surface 41f. Such a configuration can also be adopted for other containers.

  FIG. 6 is a schematic perspective view illustrating another feeding container 50 for the firefly larva and the feeding state of the firefly larva 1. The container 50 includes an opening 50a, a housing space 50b, a bait container 50c, a wall material 51, an outer end 51a, an opening edge 51b, an inner surface step 51c, and an outer surface 51f corresponding to each part of the above embodiments. ing. The container 50 has a frustoconical outer shape that gradually decreases in diameter from the opening 50a toward the outer end 51a. The container 50 of this embodiment is also configured so that the firefly larva 1 can easily reach the opening 50a by roughening the outer surface 51f.

  A large number of the firefly larvae 1 insert the head 1x into the accommodation space 50b through the opening 50a, and absorb the dissolved food while taking out the digestive fluid from the head 1x. At this time, a state similar to that in which the container 50 is plugged with a large number of firefly larvae 1 is prevented, and the digestive fluid and the feed liquid are prevented from leaking out of the container 50. Further, since the tail 1y of the firefly larva 1 comes out of the container 50, there is no problem in breathing. The manner of feeding the firefly larva 1 shown in FIG. 6 is the same even when other containers shown in the above embodiments are used.

  FIG. 7 is a schematic perspective view showing an embodiment of a firefly larva breeding apparatus 60 for breeding firefly larvae. The device 60 includes a water tank 61 and a firefly larva feeding container 50 accommodated therein. Here, any of the above-described containers may be used instead of the container 50. Inside the aquarium 61, there is a land in which high-quality soil 62 suitable for firefly breeding is spread and water 63 is stretched, and at least a part of the soil 62 is placed on the water 63. Like that. In addition, it is preferable to provide a purification system (such as a purification filter and an air pump or a circulation pump) (not shown) for purifying the water 63 inside or outside the water tank 61.

  A firefly larva (not shown) is placed in the water 63 in the water tank 61 and reared. Then, the firefly larva is fed by putting the container 50 containing the food into the water. In this way, the growth of firefly larvae becomes extremely fast and the deterioration of the water quality is suppressed, so that it is not necessary to frequently change the water or the filter. When the firefly larvae grow sufficiently, the larvae rise to the land by darkening the surroundings and hatch in the soil 62. After that, when the pupae grow sufficiently, they become adults when they are hot and humid and dark, appear from the soil 62, and dance while emitting fluorescence.

  The firefly larva breeding method, the firefly larva feeding container, and the firefly larva breeding apparatus of the present invention are not limited to the above illustrated examples, and various modifications can be made without departing from the scope of the present invention. Of course. For example, each of the above embodiments exemplifies one having an opening and a storage space, but an integrated feeding container having a plurality of sets of openings and a storage space opened thereby is configured. May be.

The schematic perspective view which shows the structure of the firefly larva feeding container of 1st Embodiment. The longitudinal cross-sectional view (a) and cross-sectional view (b) of the container of 1st Embodiment. The schematic perspective view of the firefly larva feeding container of 2nd Embodiment. The schematic longitudinal cross-sectional view of the firefly larva feeding container of 3rd Embodiment. The schematic longitudinal cross-sectional view of the firefly larva feeding container of 4th Embodiment. The schematic perspective view which shows the firefly larva feeding container of 5th Embodiment, and the firefly larva during feeding. The schematic perspective view of a firefly larva rearing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Firefly larva feeding container, 10a ... opening part, 10b ... accommodation space, 10c ... bait accommodation part, 11 ... wall material, 11a ... outer edge part, 11b ... opening edge, 11c ... inner surface level | step difference, 11x, 11y ... opening edge 60, firefly larva rearing device, 61 ... aquarium, 62 ... soil, 63 ... water, 1 ... firefly larva, 1x ... head, 1y ... tail

Claims (14)

  A method for raising firefly larvae, characterized in that food is accommodated in a container having an opening, and this is placed in water to feed the firefly larvae.   The method for raising fireflies according to claim 1, wherein the container is provided with an accommodation space in which one side is opened at the opening and the other side is closed.   The method for raising firefly larvae according to claim 2, wherein the diameter of the opening in a circle is within a range of 3 to 10 mm.   The method for raising fireflies larvae according to claim 3, wherein the maximum depth viewed from the opening of the container is in the range of 3 to 12 mm.   A feeding container for a firefly larva, comprising: an opening; and a storage space that is open at one side at the opening and closed at the other side.   The firefly larva according to claim 5, wherein a bait container is provided in the inner part of the housing space, and an inner surface step for holding food is formed on the opening side of the bait container. Feeding container.   The feeding space for a firefly larva according to claim 5 or 6, wherein the housing space has a shape in which a cross-sectional area gradually decreases from the opening toward the back.   The feeding container for a firefly larva according to any one of claims 5 to 7, wherein the opening has an opening edge shape that is not arranged on the same plane.   The feeding container for a firefly larva according to any one of claims 5 to 8, further comprising an outer shape whose cross-sectional area gradually decreases from the one side toward the other side.   The feeding container for a firefly larva according to any one of claims 5 to 9, wherein the outer end portion on the other side has a protruding shape.   The feeding container for firefly larvae according to any one of claims 5 to 10, wherein an outer surface is roughened.   The feeding container for firefly larvae according to any one of claims 5 to 11, wherein the opening has a circular equivalent diameter in a range of 3 to 10 mm.   The feeding container for firefly larvae according to any one of claims 11 to 14, wherein a maximum depth seen from the opening is in a range of 3 to 12 mm. A firefly larva rearing device comprising: the firefly larva feeding container according to any one of claims 5 to 13; and a water tank for housing the firefly larvae feeding container.

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