JP6649835B2 - Firefly larva rearing system and firefly larva rearing method - Google Patents

Description

  The present invention provides a shellfish growth region in which shellfish serving as bait for firefly larva grow, a firefly larva growth region substantially isolated from the shellfish growth region by being surrounded by side walls, and freshwater supply means, and fresh water is provided on the side wall. The firefly larva breeding system that allows the shellfish to enter the firefly breeding area by going up the outer wall by going back to the flow of fresh water traveling on the outer wall of the side wall, It also relates to a similar method for raising firefly larvae.

  Fireflies are insects that are classified in the family Coleoptera, Fireflies, and are known for emitting light, and about 40 species live in Japan. Among them, Genji firefly (scientific name "Luciola cruciata", the same applies hereinafter), Heike firefly (scientific name "Luciola lateralis", same applies hereinafter) and the like are widely known.

  Genji fireflies are about 15 mm long and are the largest species in Japan. Larvae are aquatic, live in sparsely flowed areas, and often grow for about a year, preying on a snail, a kind of snail. And around April, when it rains, it will land on the riverbank and dives into the soil to become a pupa. The pupa lasts about 50 days, and becomes an adult around May or June. Adults rest in the shade in the daytime and emit and fly after sunset. Adults communicate with other individuals by luminescence, and males and females meet and mate. Mating females lay about 500 eggs on moss on the riverbank. The eggs hatch in about 30 days, and the hatched larva dives underwater and starts living.

  Heike fireflies are smaller species than Genji fireflies and inhabit paddy fields and wetlands. Larvae prey on mussels, snails, crocodile and the like. Life cycle is similar to Genji firefly.

  Genji fireflies and heike fireflies are popular among people as an early summer feature for adults to emit and fly on riversides at night, and are popular for observation and ornamental use. For this reason, various breeding methods are known in spite of complexity such as changing the habitat of eggs, larvae, pupae, and adults.

  In spite of the fact that these fireflies are insects that inhabit the waterside of familiar areas such as satoyama, in recent years, due to the effects of river improvement, cultivated land maintenance, the spread of pesticides, gray water drainage, etc., in those areas, The population in the natural environment has decreased significantly.

  On the other hand, Genji fireflies, in particular, require a relatively clear running water environment, and with the growing interest in protecting the natural environment and preserving satoyama, the landscape and environment of satoyama's original waterfront are being maintained. Is treated as an indicator that

  Therefore, as it will lead to environmental protection in the immediate area, we will try to protect fireflies etc. and protect the environment necessary for firefly habitation, as well as regenerate the environment necessary for firefly growth in places where fireflies lived before, Furthermore, many attempts have been made to artificially create an environment necessary for firefly growth, such as a biotope. There have been many attempts to artificially breed Genji fireflies on a certain scale or more and release their larvae or adults into their outdoor firefly growing environment.

  Kawanina, a kind of shellfish that feeds on firefly larvae, is a type of snail classified in the family Cavernidae and inhabits the bottom of freshwater bodies such as rivers, irrigation canals, and lakes. In addition to feeding on larvae such as Genji fireflies and Heike fireflies, carp, mokuzugani and sawagani are also natural enemies of Kawanina. It is known that the bait feeds on organic matter such as fallen leaves and attached diatoms, seeks the bait, performs a run-up action against the water flow, and is flowed downstream when the flow velocity exceeds a certain level.

As an artificial breeding means for fireflies, for example, in Patent Document 1, vegetation stones are arranged on both side edges, a unit channel formed with concrete bottom is provided, laying stones are arranged, and an overflow weir is provided at the connection part. A water channel for growing water-based fireflies provided with, in Patent Document 2, a water area and a land area are provided in a container, and a water circulation pump is used to circulate water to the water area through the land area and provide a water purifying means. The aquaculture apparatus is disclosed in Patent Document 3 as a running water supply device, an assembling type waterway, and an artificial breeding system for aquatic insects comprising a spring pipe, and in Patent Document 4, a stepped step is provided and arranged. It consists of a water tank, a water flow means for flowing water from the upper water tank to the lower water tank, and a pump for supplying water to the uppermost water tank, laying pebbles etc. in each water tank, and Firefly aquaculture device to put Kawaina in Patent Document 5 Place the net container in the natural water flow, put shellfish inside this net container, breed it, put firefly larva inside the net container, grow inside the net container until it reaches the last instar larva The method of growing fireflies is described in Patent Document 6, a pseudo-stream laid with sand at the bottom, a pseudo-bank for landing of firefly larvae provided on one side thereof, and a high stream downstream of the pseudo-stream. Patent Document 7 discloses a firefly cultivation apparatus having a housing formed such that the firefly larvae and kawana are housed in a state where a plurality of crushed stones are laid on the bottom of a cup-shaped container. Regarding the breeding method, Patent Literature 8 describes firefly larvae and kawanin breeding apparatuses each having a breeding tray section and a water tank section on a rack section extending in the vertical direction.
JP-A-8-322429 JP 2000-157101 A JP 2001-258424 A JP 2002-281865 A JP 2003-23920 A JP 2004-222704 A JP 2005-333831 A JP 2007-82517 JP

  Although larvae such as fireflies are highly resistant to starvation, they have a strong feeding activity, so when artificially rearing firefly larvae, it is necessary to regulate the supply of shellfish that feed on firefly larvae . For this reason, it is necessary to pay excessive attention to the management and maintenance of shellfish as feed, and to feeding of firefly larvae, which is complicated. Therefore, an object of the present invention is to provide means capable of maintaining the artificial breeding of firefly larvae while reducing the work load.

  In the present invention, the shellfish growth region in which the shellfish serving as the bait of the firefly larva grows, the firefly larva growth region in which freshwater is stored inside, which is substantially isolated from the shellfish growth region by being surrounded by a side wall, and Freshwater supply means for supplying freshwater to the pooled water of the firefly larva cultivation area, and the freshwater overflowing from the firefly larva cultivation area over the side wall and overflowing along the outer wall surface of the side wall to grow the shellfish Provided is a firefly larva breeding system and the like that can adjust the case of flowing into a region and the case of not transmitting along the outer wall surface.

  In this system, when the freshwater does not travel on the outer wall, the shellfish is separated from the firefly larva growing area by the side wall, and when the freshwater travels on the outer wall, the shellfish is It is possible to enter the firefly cultivation area by moving upward against the outer wall surface in a direction opposite to the flow of fresh water flowing along the outer wall surface of the side wall.

  In other words, by adjusting the case where freshwater stored in the firefly larva breeding area travels along the outer wall of the side wall of the same area and the case where it does not travel, the shellfish serving as the bait of the firefly larva can enter the firefly larva development area. If not, you can adjust.

  And by controlling the case where fresh water travels along the outer wall of the side wall of the same area and the case where it does not travel, the supply of shellfish that feeds on firefly larvae can be adjusted, so that the acquisition and maintenance of shellfish that feeds -It is possible to maintain the artificial breeding of firefly larvae while reducing the work load such as management and feeding work to the firefly larvae.

  The firefly larva breeding system according to the present invention may be applied, for example, at an outdoor location where at least shellfish that feed on the firefly larva can grow.

  For example, the waterside where the population is decreasing but fireflies still inhabit, the waterfront, artificial ponds, artificial waterways, biotopes where fireflies inhabited and are currently regenerating the environment necessary for firefly growth In an outdoor place where the environment for the growth of fireflies is prepared, such as waterside-like spaces, artificial ponds, artificial waterways, etc. that artificially created the environment necessary for firefly growth, inside the freshwater area or Adjacently, a firefly larva breeding area surrounded by a side wall is formed, and the firefly larva is released into the inside.

  Freshwater is supplied to the pooled water of the firefly larva breeding area, and overflows from the side wall of the firefly larva cultivation area. Area). Then, utilizing the property that shellfish that feed on fireflies larvae run up against the water flow, when freshwater travels on the outer wall surface, the shellfish move to the flow of freshwater along the outer wall surface of the side wall. Go backwards and turn up the outer wall to enter the firefly larva rearing area. On the other hand, when freshwater does not travel on the outer wall surface, the upward flow of freshwater from the firefly larva breeding area to the shellfish growth area is interrupted, so that the shellfish cannot enter the firefly larva breeding area. Therefore, by adjusting the case where fresh water travels along the outer wall surface of the side wall of the firefly larva breeding area and the case where it does not travel, even when outdoors, shellfish that feed on the firefly larva can enter the firefly larva breeding area and the time when it can not enter. Can be adjusted.

  In recent years, fireflies have been set up in many places for firefly breeding, and firefly larvae have been released there. However, there have been very few cases where fireflies grew and settled in those places. The inventor believes that the reason is that (1) when releasing firefly larvae, they disperse and grow under stones and in the gaps of gravel, so it is impossible to know where and how much the firefly larva has settled, and ( 2) As mentioned above, it was presumed that firefly larvae were so active in feeding that shellfish, which are the foods of firefly larvae, would be consumed.

  On the other hand, in the case of the firefly larva rearing system, the firefly larva is localized in the firefly larva rearing area and is established therein. Firefly larvae, in principle, stay in the firefly larva breeding area until just before they become pupae and do not escape themselves, so even when this system is applied outdoors, the number and status of firefly larvae can be easily and easily determined. Can be grasped relatively accurately.

  In addition, in the case of this system, only the shellfish that climbed over the side wall of the firefly larva rearing area feed on the firefly larvae, while the shellfish that stays in the shellfish growth area outside the firefly larva rearing area are not eaten by the firefly larvae. However, there is no fear that the shellfish which feed on the firefly larvae will be consumed, and the shellfish can be maintained continuously. By adjusting the case where the fresh water travels along the outer wall surface of the side wall of the firefly larva breeding area and the case where it does not travel, the supply of the shellfish serving as the bait of the firefly larva to the firefly larva can be adjusted to an appropriate amount.

  Therefore, this system can be applied outdoors, and this system can be used outdoors to reduce the work load such as the management and maintenance of shellfish that feed on firefly larvae and the work of feeding firefly larvae. Artificial rearing can be maintained.

  According to the present invention, it is possible to relatively easily and with low labor to adjust the supply amount of shellfish serving as bait for firefly larvae, thereby reducing the work load such as feeding work to firefly larvae and reducing firefly larvae. It is possible to maintain artificial breeding.

<About the firefly larva rearing system according to the present invention>
The present invention provides a shellfish growth region in which shellfish serving as bait for firefly larvae grow, the firefly larva growth region in which freshwater is stored inside by being substantially isolated from the shellfish growth region by being surrounded by a side wall. Freshwater supply means for supplying freshwater to the pooled water of the firefly larva cultivation area, and the freshwater overflowing from the firefly larva cultivation area over the side wall and overflowing along the outer wall surface of the side wall to grow the shellfish Includes all firefly larva breeding systems that can control when they flow into the area and when they do not travel on the outer wall. Hereinafter, an example thereof will be described with reference to FIG. 1 and FIG. Note that the present invention is not narrowly limited to only this embodiment.

  FIG. 1 is a schematic external perspective view showing an example of a firefly larva breeding system according to the present invention, and FIG. 2 is a schematic sectional view in the water flow direction. It should be noted that FIGS. 1 and 2 are separate examples, and not all the components in both figures are correlated.

  The firefly larva breeding system A of FIG. 1 and FIG. 2 is substantially isolated from the shellfish breeding region 1 by being surrounded by the shellfish growing region 1 where the shellfish S that feed on the firefly larva N grows, and the side wall 21. Firefly larva rearing area 2 in which freshwater W1 is stored in 22, freshwater supply means 3 for supplying freshwater into stored water W1 in firefly larva rearing area 2, and a cut formed in part of upper edge 23 of side wall 21. The drainage means 4 for draining the freshwater W1 stored in the firefly larva breeding area 2 without overflowing, at a position slightly below the overflow height 25 on the notch 24 and the upper edge 23 side of the side wall 21. And The flow of fresh water is formed from the upstream side X1 to the downstream side X2. The fresh water W0 supplied to the stored water W1 of the firefly larva cultivation region 2 by the freshwater supply means 3 flows over the stored water W1 of the firefly larva cultivation region 2 from the side wall 21 (the notch 24 of FIG. 2). After traveling along the outer wall surface of the side wall 21 (see reference numeral W2) (see reference numeral W3), it flows into the shellfish growth area 1 (see reference numeral W4). On the other hand, when the stored water W1 in the firefly larva growing area 2 is discharged from the drainage means 4, the water flows into the shellfish growing area 1 without passing through the outer wall surface of the side wall 21 (see reference numeral W5). When the freshwater W is flowing over the side wall 21, the shellfish S moves in the direction Y1 of the firefly larva breeding area 2 (refer to the sign S1) in a direction opposite to the flow, and further moves the outer wall surface of the side wall 21 upward Y2. It moves (see sign S2) and enters the firefly larva rearing area 2.

  The firefly larva rearing system A is applicable both indoors and outdoors. For example, the present invention can be applied to a case where firefly larvae N are artificially bred at a certain scale or more indoors. In addition, outdoors, at least a place where there is a freshwater area in which the shellfish S serving as a feed for the firefly larva N can grow, for example, the waterside where the population is decreasing but the fireflies still inhabit, and the fireflies are conventionally inhabited. Waterfronts, artificial ponds and artificial waterways that are currently regenerating the environment necessary for firefly growth, waterfront-like spaces, artificial ponds, artificial waterways, etc. that artificially create the environment necessary for firefly growth such as biotopes It can also be applied to places where the environment for the growth of firefly larvae is in place.

  Regarding the type of fireflies N, this system A can be applied in principle to any type of fireflies that prey on shellfish S that perform a run-up behavior at the time of larvae. For example, the present system A is also applicable to Genji fireflies that prey on Kawana during larvae, and Heike fireflies that prey on larvae during the larvae.

  The shellfish growth area 1 is an area where shellfish S serving as a feed for the firefly larva N grows. When applied as an indoor firefly larva artificial breeding facility, a facility such as an aquarium capable of growing such shellfish can be adopted as the shellfish growth area 1. For example, freshwater is poured into a water tank to a certain height, shellfish are released into the tank, and the shellfish are bred and maintained while feeding. On the other hand, when this system A is applied outdoors, freshwater areas where shellfish S that feed on fireflies larvae N can grow, for example, the waterside of places where the population is decreasing but fireflies still inhabit A waterfront-like space where fireflies inhabited and the environment necessary for firefly growth, such as waterfronts, artificial ponds, artificial waterways, and biotopes that are currently regenerating the environment necessary for firefly growth, Artificial ponds and artificial waterways correspond to the shellfish growth area 1.

  As the type of the shellfish S serving as a feed for the firefly larva N, a feed serving for the firefly larva to be grown is selected and applied. For example, when raising larvae of Genji fireflies, Kawana are grown in the shellfish growth area 1, and when raising larvae of Heike fireflies, the mussels, snails and kawana are grown.

  The firefly larva breeding area 2 is an area for breeding firefly larvae N, in which freshwater W1 is stored and firefly larvae N are discharged. The firefly larva growing region 2 is formed inside or adjacent to the shellfish growing region 1 and is substantially isolated from the shellfish growing region 1 by being surrounded by a side wall 21. That is, the shellfish growth region 1 and the firefly larva breeding region 2 are separated by the side wall 21, and the firefly larva N stays in the firefly larva breeding region 2 until immediately before becoming a pupa, and does not escape from itself, They grow there.

  The firefly larva breeding region 2 may be formed by being at least substantially isolated from the shellfish growing region 1 by being surrounded by the side wall 21 and is not narrowly limited by its form or the like.

  For example, a bottomed substantially cylindrical member having an open top surface (for example, a substantially basin-like or trough-shaped box, container, water tank, or the like) is placed inside or adjacent to the shellfish growth area 1. And a hollow portion inside thereof may be used as a firefly larva rearing area 2. At this time, the substantially cylindrical member is capable of storing fresh water in a hollow portion inside thereof, and supplies fresh water W into the stored water W1 to form a part of the upper edge of the substantially cylindrical member. ).

  Further, for example, a substantially cylindrical member (for example, a tubular member or the like) having an open top and bottom surface may be erected inside the shellfish growth area 1 and the hollow part inside the shellfish growth area 2 may be the firefly larva growth area 2. . At this time, the substantially cylindrical member can store fresh water in a hollow portion inside the same, and supplies fresh water into the stored water so as to exceed the upper edge (part of) the substantially cylindrical member. It is formed so that it can be flowed. Therefore, when fresh water is supplied by the fresh water supply means 3, the amount of fresh water to be supplied is larger than the amount of fresh water flowing out, and at least a state in which fresh water W can overflow from the substantially cylindrical member. The gap between the installation surface and the lower edge of the substantially cylindrical member needs to be closed to the extent that it can be maintained. Further, the gap needs to be closed to such an extent that the firefly larva N does not escape from the gap between the installation surface and the lower edge of the substantially cylindrical member.

  The shape of the substantially cylindrical member may be any widely known one such as a substantially columnar shape or a substantially rectangular parallelepiped shape, and is not particularly limited. A member forming the side wall 21 such as a substantially cylindrical member has a water shielding property such that freshwater can be stored therein when the firefly larva cultivation area 2 is formed, and the shellfish S serving as a bait of the firefly larva N Any known material may be used widely, and the material is not limited to a narrow one so long as the surface can be upwardly directed. For example, a box / tubular member made of hard polyvinyl chloride, a wooden box / container, a glass or plastic container / water tank, or the like may be used.

  The inside 22 of the firefly larva rearing area 2 is used as an area for breeding firefly larvae. Freshwater W1 is stored in the interior 22, and firefly larvae N grow near the bottom thereof. For the growth of firefly larva N, for example, on the bottom surface of the interior 22 of the firefly larva breeding area 2, by placing stones, natural gravel or the like as appropriate, or by laying granular materials such as coral sand or activated carbon as appropriate, It is also possible to form a gap or unevenness that becomes a hiding place or a dwelling place for the firefly larva N. In addition, in some cases, bait of firefly larva N, bait of shellfish to be a bait of firefly larva N, or the like may be appropriately supplied to the inside 22 of the firefly larva breeding area 2.

  In principle, freshwater W2 that overflows from the firefly larva rearing area 2 and overflows from the side wall 21 overflows from any position of the upper edge 23 of the firefly larva rearing area 2 and travels along the outer wall surface of the side wall 21. Flow into shellfish growth area 1. Then, when the freshwater W is flowing over the side wall 21, the shellfish S serving as the bait of the fireflies larva N goes back to the flow of the freshwater W3 traveling along the outer wall surface of the side wall 21 and upwards the outer wall surface, Enter the firefly larva rearing area 2.

  Further, for example, a cutout portion 24 may be formed in a part of the upper edge 23 of the side wall 21 so that the fresh water W overflows from the portion 24. By forming the notch 24 in a part of the upper edge 23 of the side wall 21, it is possible to define the overflow area, and therefore, on the outer surface of the side wall 21, the presence or absence of the upward movement of the shellfish S serving as the bait of the firefly larva N・ It becomes easy to grasp the situation, and it is also easy to maintain the system and find defects. By forming the notch 24 in a part of the upper edge 23 of the side wall 21, the overflow height 25 of the fresh water W is not the upper edge 23 of the side wall 21, but is recessed by the formation of the notch 24. The height of the part.

  The freshwater supply means 3 is a member for supplying freshwater into the stored water W1 of the firefly larva breeding area 2. By supplying fresh water to the stored water W1 of the firefly larva cultivation area 2 by the freshwater supply means 3 (see reference numeral W0), fresh fresh water W is supplied to the firefly larva cultivation area 2 and the stored water in the same area 2 is supplied. Since a gentle flow of water can be formed in W1, the breeding environment for the firefly larvae N can be favorably maintained. Further, by supplying fresh water into the storage water W1 of the firefly larva breeding area 2 (see reference numeral W0), the amount of the storage water W1 can be increased, and the side wall 21 can overflow from the firefly larva breeding area 2 and overflow. it can.

  The freshwater supply means 3 only needs to be able to supply freshwater in such an amount as to maintain and raise the water level in the firefly larva breeding area 2, and supply the freshwater using a pump, a natural water flow or a height difference. Known devices such as a device / flow path and an air lift pump can be widely used, and are not particularly limited. Further, the fresh water W to be supplied may be any fresh water suitable for growing the firefly larva N. For example, freshwater supplied from another place, freshwater existing at or near the place to which the present system A is applied, freshwater stored in the shellfish growth area 1, and the like are also applicable as the freshwater W to be supplied.

  In the present system A, it is possible to adjust whether freshwater W travels along the outer wall surface of the side wall 21 of the firefly larva growing area 2 or not. Thereby, when the freshwater W does not travel on the outer wall surface of the side wall 21 of the same area 2, the shellfish S serving as the bait of the firefly larva N is separated from the firefly larva growing area 2 by the side wall 21, and the freshwater W When traveling along the outer wall surface of the second side wall 21, the shellfish S can enter the firefly larva rearing area 2.

  Means for adjusting the case where the fresh water W does not travel along the outer wall surface of the side wall 21 of the firefly larva breeding area 2 can be widely used, and is not particularly limited. For example, in the fresh water supply means 3, by adjusting the presence or absence or the supply amount of the fresh water W at regular time intervals or at an arbitrary time, the fresh water W overflows the side wall 21 and is outside the side wall 21 of the same area 2. It is possible to adjust the case where the water does not travel along the wall surface and the case where the water does not travel along the outer wall surface of the side wall 21 in the same area 2 when the water is stored without overflowing the side wall 21.

  Further, for example, a case where a baffle plate erected in a substantially horizontal direction from the outer wall surface of the side wall 21 of the firefly larva rearing area 2 is detachably formed and the baffle plate is attached to the outer wall surface of the side wall 21 of the same area 2 In the case where fresh water W flows on the upper surface of the baffle plate and then flows into the shellfish growth area 1 without passing through the outer wall surface, and when the baffle plate is removed, fresh water W May flow into the shellfish growth area 1. Accordingly, when the baffle plate is attached, the freshwater W traveling on the outer wall surface is blocked, and the shellfish S is prevented from running up. At that time, even if the blocking of the fresh water W on the outer wall surface of the side wall 21 is incomplete, since the baffle plate functions like a mouse return, even if the shellfish S faces the outer wall surface of the side wall 21 Thus, the invasion into the firefly larva rearing area 2 is completely prevented. On the other hand, when the baffle is removed, the freshwater W flows over the side wall 21 as usual, and then travels along the outer wall surface of the side wall 21 in the area 2, so that the shellfish S rises up the outer wall surface of the side wall 21. To the firefly larva rearing area 2.

  In addition, for example, as shown in FIG. 1, at the upper edge 23 side of the side wall 21, at a position slightly below the overflow height 25, without causing the freshwater W1 stored in the firefly larva growing area 2 to overflow. Drainage means 4 for draining, the drainage means 4 is capable of adjusting the presence or absence of drainage, when the discharge from the discharge means 4 is stopped, the fresh water W overflows the side wall and the A configuration may be adopted in which the fresh water W does not travel along the outer wall surface when it travels along the outer wall surface (see reference numeral W2) and is discharged from the discharge means 4 (see reference numeral W5).

  When the discharge of the freshwater W from the discharge means 4 is stopped, the stored water W1 in the firefly larva breeding area 2 is adjusted to the upper edge of the firefly larva cultivation area 2 as usual. Overflowing from any one of the positions 23, the water flows along the outer wall surface of the side wall 21 and then flows into the shellfish growth area 1. Accordingly, the shellfish S serving as a bait of the firefly larva N can enter the firefly larva breeding area 2 by going up the outer wall surface in a direction opposite to the flow of the freshwater W3 traveling on the outer wall surface of the side wall 21.

  On the other hand, when the freshwater W is discharged from the discharging means 4 (see reference numeral W5), the water level of the stored water W1 in the firefly larva rearing area 2 is adjusted by setting the discharging means 4 Since it only rises to the height and does not reach the overflow height, overflow from the upper edge 23 of the firefly larva rearing area 2 does not occur. At the same time, since the discharge end of the drainage means 4 is separated from the outer wall surface of the side wall 21, the flow of water along the outer wall surface of the side wall 21 also disappears. Therefore, the shellfish S serving as a bait of the firefly larva N cannot go up the outer wall surface of the side wall 21 and cannot enter the firefly larva breeding area 2.

  Therefore, the drainage means 4 is provided as a detour path of the flow of the freshwater W flowing over the side wall 21, and by adjusting the presence or absence of drainage from the drainage means 4, the freshwater W is formed on the side wall 21 of the firefly larva growing area 2. It is possible to adjust the case where it travels on the outer wall surface and the case where it does not travel, whereby it is possible to adjust the supply amount of the shellfish S that feeds the firefly larva N to the firefly larva breeding area 2 relatively easily and with low labor .

  The drainage means 4 is formed at a position slightly below the overflow height 25 on the upper edge 23 side of the side wall 21, separately from the flow of the freshwater W overflowing the side wall 21, in the firefly larva cultivation area 2. What is necessary is just to be able to discharge the fresh water W1 to be stored, and widely known ones can be adopted, and the narrow one is not limited. For example, a tubular member (for example, a hollow elongated tube or tube) having one end opened at a predetermined height inside the firefly larva breeding area 2 and the other end opened apart from the outer wall surface of the side wall 21 is adopted. May be.

  Also, as the structure for adjusting the presence or absence of drainage in the drainage means 4, well-known ones such as a manually operated valve and a solenoid valve can be widely used. For example, an electromagnetic valve may be employed so that the presence or absence of drainage can be automatically adjusted for each time.

<About the firefly larva breeding method according to the present invention>
The present invention provides a shellfish growth region in which shellfish serving as a bait for firefly larva grow, and a firefly larva growth region in which freshwater is stored inside, which is substantially isolated from the shellfish growth region by being surrounded by a side wall. When each formed, freshwater supplied freshwater into the storage water of the firefly larva breeding area, overflows the side wall from the firefly larva breeding area, flows along the outer wall surface of the side wall, and flows into the shellfish growth area, Includes all firefly larva breeding methods for adjusting the case of not transmitting on the outer wall surface.

  As described above, a shellfish growth region (shellfish growth region) serving as a bait for firefly larva and a firefly larva growth region substantially isolated from the shellfish growth region are formed, and overflow from the firefly larva growth region over the side wall. By allowing fresh water to flow along the outer wall surface of the side wall and then into the shellfish growth area, and by adjusting the case where fresh water does not transmit along the outer wall surface of the side wall of the firefly larva growth area, It is possible to control whether or not the shellfish S serving as a bait enters the firefly larva rearing area. This makes it possible to adjust the supply amount of the shellfish serving as bait for the firefly larvae relatively easily and with low labor.

  Example 1 In Example 1, a prototype model of the firefly larva breeding system according to the present invention was prepared, and it was verified whether the supply of shellfish serving as bait for the firefly larva could be adjusted.

  Freshwater was placed in a breeding aquarium measuring 60 cm in length, 30 cm in width and 30 cm in depth as freshwater to reach a height of about 10 cm, and about 20 Kawaina were released into the breeding area.

  A polyvinyl chloride tube having a diameter of 20 cm and a height of 15 cm was erected in the breeding aquarium, and the hollow region inside the tube was used as a firefly larva breeding region. By pumping fresh water in the breeding aquarium and supplying the fresh water to the hollow area of the polyvinyl chloride pipe, the fresh water overflows from the upper edge of the polyvinyl chloride pipe while circulating, It was able to flow into the breeding aquarium. The water level in the breeding aquarium was maintained at about 5 cm. Two Genji firefly larvae were released into the hollow area of the polyvinyl chloride tube.

  When the pump was operated and fresh water was allowed to flow from the upper edge of the polyvinyl chloride pipe while maintaining the circulation of fresh water, several kawanaina turned up the outer wall of the polyvinyl chloride pipe, and the hollow area Invaded.

  On the other hand, when the pump was stopped, the fresh water did not flow from the upper edge of the polyvinyl chloride pipe, the outer wall surface of the polyvinyl chloride pipe dried, and the fresh water stopped flowing along the outer wall face. The upward movement of Kawana on the outer wall surface of the polyvinyl chloride pipe and the intrusion into the hollow region were no longer observed.

1 is an external perspective schematic view showing an example of a firefly larva rearing system according to the present invention. FIG. 1 is a schematic sectional view in a water flow direction showing an example of a firefly larva rearing system according to the present invention.

1 Shellfish growth area
2 Firefly larva rearing area
21 Side wall of firefly larva rearing area 2
22 Inside the firefly larva rearing area 2
23 Upper edge of firefly larva rearing area 2
24 Notch
25 Freshwater W overflow height
3 Freshwater supply means
4 Drainage means
A firefly larva rearing system
N firefly larva
Shellfish that feed on S firefly larvae
W (W1-W5) Freshwater
W1 Storage water
W2 overflow water
X1 upstream
X2 downstream

Claims (6)

Shellfish growth area where shellfish which feed on firefly larva grows,
Fireflies larva breeding area, which is substantially isolated from the shellfish growing area by being surrounded by the side wall, and has freshwater stored therein, and
Freshwater supply means for supplying freshwater to the storage water of the firefly larva growing area,
And, when freshwater supplied into the storage water of the firefly larva breeding area flows over the side wall from the firefly larva breeding area , travels along the outer wall surface of the side wall, and then flows into the shellfish growth area, and along the outer wall surface. A firefly larva rearing system that can adjust when and when not. When the freshwater does not travel on the outer wall surface, the shellfish is separated from the firefly larva growing area by the side wall,
When the fresh water travels along the outer wall surface, the shellfish can enter the firefly larva breeding area by going up the outer wall surface in a direction opposite to the flow of the fresh water. Firefly larva rearing system.   3. The firefly larva breeding system according to claim 1, wherein a cutout portion is formed in a part of an upper edge of the side wall, and the freshwater overflows from the cutout portion. Wherein the upper edge of the side wall, the position of the side bottom Ri by the overflow height, provided with drainage means for draining the fresh water stored in the firefly larvae growing area without flow Yue,
The drainage means can adjust the presence or absence of drainage,
When the discharge from the discharge means is stopped, the fresh water flows over the side wall and flows along the outer wall surface,
4. The firefly larva cultivation system according to any one of claims 1 to 3, wherein the fresh water does not travel along the outer wall surface when the fresh water is discharged from the discharging means.   The firefly larva breeding system according to any one of claims 1 to 4, which is applied outdoors at a place where freshwater bodies capable of growing at least shellfish serving as firefly larvae can grow. A shellfish growth region in which shellfish serving as a bait for firefly larva grows, and a firefly larva growth region in which freshwater is stored while being substantially isolated from the shellfish growth region by being surrounded by side walls, ,
Freshwater subjected fed to the storage water of the firefly larvae growing region, and if the from the firefly larvae growing region along the outer wall surface of the overflow flow the sidewall the sidewall flows into the shellfish growing area, not Tsutawa the outer wall surface Firefly larva rearing method to adjust the case.

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