JP2015122989A - Aquaculture device of shellfish - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scallop aquaculture device capable of solving such contradicting problems together that a hanging aquaculture with a weight increases harvest and is preferable, however, landing work is troublesome and complexed, and the smooth and speedy landing work is inhibited according to the hanging aquaculture with the weight.SOLUTION: A hanging aquaculture device 1 of shellfish is characterized by hanging down a rope and basket in the sea, and making the rope and basket hold spats for culturing. A weight body 20 is hung in the lower end of the rope 4 and the lower end of the basket of the hanging aquaculture device by a hanging tool. The hanging tool 21 is formed of a biodegradable plastic film. For example, the hanging tool is formed of the film made of a biodegradable water-soluble plastic product.

Description

  The present invention relates to a shellfish culturing apparatus that holds shellfish such as scallops on a rope or ridge, and cultivates shellfish by hanging the rope or ridge in the sea.

As a method of culturing shellfish such as oysters, scallops, and scallops, a hanging culture is conventionally performed in which young larvae are held in ropes and ridges and then introduced into the sea for cultivation.
As an example of drooping culture of shellfish, scallop culture is given.
The lock pin is inserted into the rope so as to be orthogonal to the pitch, and the end of the lock pin is inserted into the ear hanging hole formed in the ear piece of the scallop shellfish, and the shellfish is locked to the lock pin. 2. Description of the Related Art A hanging type aquaculture apparatus that holds, suspends, throws a rope into the sea, hangs it, and cultivates it has been known (see, for example, Patent Document 1).

An example of an aquaculture device used for the drooping culture of scallops is as shown in FIG.
The aquaculture device has two anchor ropes driven into the seabed, a horizontal rope (trunk) tied between the upper ends of the anchor ropes, and a predetermined distance in the length direction (lateral direction) of the horizontal rope. It is composed of a plurality of vertical ropes suspended (suspended) at the top, and each anchor rope is connected to an exposed floating body with the upper half exposed on the sea surface via a connecting string, and the horizontal rope is long. A plurality of floating bodies held at a predetermined depth in the sea at predetermined intervals in the vertical direction (lateral direction) are connected via a connecting string.

  The above-described vertical rope of the aquaculture device has a diameter of 6 to 8 mm and a length of 10 to 15 m, for example. A locking pin having locking portions formed at both ends of the vertical rope is passed through and held in a direction perpendicular to the length direction of the rope at a pitch of 100 to 130 mm, for example, to lock both ends of the locking pin. The part is pierced and passed through an ear suspension hole drilled in the ear piece of a juvenile shellfish, and the juvenile shell is locked and held at both ends of the lock pin.

Utility Model Registration No. 3178830

In the above, in the hanging culture device, although the anchor rope is firmly fixed by a floating body, an anchor, etc., it is connected to the horizontal rope, and the scallop shellfish is held by the locking pin etc. and is suspended in the sea. The vertical rope vibrates up and down due to the influence of waves and tidal currents, and is swept horizontally.
In particular, due to the vertical vibration of the vertical rope caused by waves, the scallop shells close more frequently, which greatly affects the feeding activities of the scallop shells.
As a result, the active feeding activity of the scallops is suppressed, and as a result, the growth of the scallops is delayed.
The situation is the same in the hanging cocoon type that connects and hangs the cocoons in a multi-stage manner, and accommodates and raises juvenile shellfish in the cocoons.
In other words, the cocoons that are connected via a rope and hang down in the sea vibrate, and the shells contained in the cocoon move in the cocoon and contact with each other, feeding activity is suppressed, and growth occurs. Adversely affect.

From this, a weight of about 200 g to 1 kg is attached to the lower end of each vertical rope (hanging rope), and the vibration of the rope due to waves or the like is suppressed as much as possible by the weight.
The suspension of the weight suppresses the vibration of the rope caused by waves and the like, and the frequency of closing the shells is reduced. As a result, the feeding activity of the scallops is promoted, and the growth of the scallops is promoted and realized. it can.
The situation is the same in hanging rod type aquaculture that connects and hangs pupae in multiple stages and accommodates larvae in the cage and cultivates them. However, since shellfish housed in the cage come into contact with each other and feeding activity is suppressed and growth is adversely affected, the weight is suspended from the lowest cage via a rope or the like.

Although cultivation with a rope with a weight causes an increase in yield and a shortening of the cultivation period compared to the case without a weight, a problem occurs when landing.
For example, landing is performed by the following setup.
(1) The main rope (lateral rope) is moored to the ship.
(2) Remove the rope with shells (vertical rope) from the trunk.
(3) A device that squeezes shells off the rope (commonly called an area that does not hold scallops around the upper 2m so that this part is not tied to the trunk rope or even affected by waves). Sandwiched between the ears).
(4) Set the pinched rope on the hoisting machine and start winding.
(5) The rope with shells is rubbed off at the ear-cut section, and the shells placed directly under it, accommodated in a conveyor or the like, are transported and poured into the accommodation container.
(6) Finally, remove the weight attached to the lower end of the rope.
By repeating the above, several tons of shellfish are landed in a few hours.

In addition to the above landing, in drooping-type aquaculture, if it grows for about 6 months after being put into the sea, its own weight becomes 2 to 3 times, and in addition to the shellfish, a lot of miscellaneous substances adhere to the shell outer surface, The foods compete between the attached miscellaneous matter and the cultured shellfish, and the cultured shellfish and the miscellaneous matter compete for food. As a result, the feeding of the cultured shellfish is inhibited.
For this reason, after starting droop culture, the rope is pulled up in about six months, and the work of cleaning and removing the adhering impurities on the shell held on the rope is performed.
During this cleaning and removal work, the weight attached to the lower end of the rope gets in the way, and it is necessary to remove the weight.

  According to the present invention, it is preferable that drooping culture with a weight causes an increase in yield, whereas drooping culture with a weight requires a weight removing operation, and the adhering matter washing, removing work and landing work are troublesome. To provide an aquaculture device capable of rationally solving both of these conflicting problems, which may obstruct smooth and speedy cleaning of deposits, removal work, landing work, etc. due to complexity and time. This is the issue.

  The present inventor has made the present invention by paying attention to the fact that biodegradable plastics have the property of being decomposed by microorganisms (bacteria, bacteria) and the like and finally decomposing into water and carbon dioxide. .

  Accordingly, the object of the present invention is to stop at the lower end of the hanging rope for a predetermined period (time) and function as a weight, to suppress and prevent the hanging rope vibration caused by waves and tidal currents as much as possible. In the hanging culture of shellfish that can perform the feeding activity of the shellfish well, the growth of the shellfish can be promoted, good growth can be expected, and an increase in the yield of the shellfish can be expected. After the period, the weight is automatically and automatically removed from the rope, the weight removal work is eliminated, smooth and speedy removal of trash and washing work, and the landing work after shellfish growth, and The purpose is to provide shellfish cultivation equipment that is also friendly to the natural environment.

  The invention according to claim 1 is a shell culture apparatus for cultivating a rope or cocoon by hanging a rope or cocoon in the sea and holding the juvenile shellfish on the rope or cocoon. The weight body is suspended by a hanging tool, and the hanging tool is formed of a biodegradable plastic.

  The invention according to claim 2 is characterized in that, in claim 1, the weight body is sand and / or gravel, and the hanging tool is a bag.

  The invention according to claim 3 is characterized in that, in claim 2, the bag is made of a biodegradable water-soluble plastic sheet or film.

  The invention according to claim 4 is characterized in that, in claim 1, the weight body is a natural stone, and the hanging tool is a bag.

  The invention according to claim 5 is characterized in that, in claim 1, the weight body is a concrete lump and the hanging tool is a bag.

  The invention according to claim 6 is characterized in that, in claim 1, the weight is made of metal and the hanging tool is a bag.

  The invention according to claim 7 is characterized in that, in any one of claims 2 to 5, the bag is formed of a non-woven fabric.

  The invention according to claim 8 is characterized in that, in claim 1, the hanging tool is a vertically long rod-like body, and a metal or concrete block weight is connected to the hanging tool.

  The invention according to claim 9 is characterized in that, in claim 8, the suspension has a constricted portion in the middle thereof.

  The invention according to claim 10 is characterized in that, in claim 6 or 8, a recovery rope is connected to the weight body.

  The invention according to claim 11 is characterized in that, in claim 1, the hanging tool is rope-like, and a weight is suspended from the hanging tool.

In the invention which concerns on Claim 1, in the drooping culture apparatus of the shellfish which hangs a rope and a cocoon in the sea and makes a rope and a cocoon hold a juvenile shellfish, The weight body was suspended by a hanging tool, and the hanging tool was formed of a biodegradable plastic.
Examples of biodegradable plastics include microbial systems, chemical synthesis systems, natural product systems, and composite systems thereof. For example, sand is stored in a bag made of a water-soluble polyvinyl alcohol (PVA) film. Thus, the suspension is formed by suspending the rope by suspending it on the rope. It is disassembled by the action of the above, etc., is suspended by the suspending tool, the weight body falls off from the lower end portion of the rope, and the lower end portion of the rope is in a free state having no weight body.

Therefore, the biodegradable plastic suspension at the lower end of the rope breaks down and breaks in the sea during the removal and cleaning of the growing shellfish in drooping aquaculture, and the landing work after the growth. Since the rope is removed and removed naturally from the lower end of the rope, it becomes possible to wind the rope smoothly and quickly, and it is possible to smoothly and quickly carry out the removal of shells, washing and landing operations.
In addition, since the weight removal work is not required while suspending the weight body, the advantage of using the weight body in the drooping culture, that is, the intake of shellfish caused by the waves of the ropes and sea bream and the vibration due to tidal currents, etc. It eliminates the need for weight removal work while suppressing the adverse effects such as poor feeding and realizing the hanging culture of shellfish such as scallops with good growth.

Further, in the present invention, since biodegradable plastic is used as a hanging device for the pit, after the weight is dropped, the hanging device is decomposed into water and carbon dioxide in the sea by the action of microorganisms in the sea, and the natural environment. Therefore, an excellent product can be obtained from the viewpoint of environmental conservation.
Furthermore, in the present invention, it is possible to change the period until disassembly, that is, the period in which the weight suspension comes off the rope, depending on the purpose. It is possible to obtain.
Furthermore, in the present invention, depending on the needs of the aquaculture period, for example, whether the body should be broken down after 3 months and the weight should fall off, 6 months later, 10 months later, 12 months later, etc. It is possible to control the period of decomposition by adjusting the thickness of the sheath and the fabric, etc., and it is possible to select a preferred weight drop according to the type and needs of the shellfish.

In the invention according to claim 2, the weight body is sand and / or gravel, and the hanging tool is a bag.
Sand and gravel are used as weights, sand and gravel are stored in a bag, and suspended from the lower end of the rope to form a weight. The function as a weight is lost and disappears, and the weight disappears (drops out) easily and reliably.
In addition, the weight that disappears (drops) in the sea is discharged as sand and gravel, so it does not harm the environment and is environmentally friendly.

  In the invention according to claim 3, since the bag in claim 2 is a biodegradable water-soluble plastic sheet or film, the composition and thickness of the water-soluble plastic sheet or film is set to 3 months. It is easily possible to arbitrarily set a time and period such as 6 months.

In the invention which concerns on Claim 4, a weight body is a natural stone and a hanging tool is a bag.
Since natural stone is used as the weight body, woven fabric, non-woven fabric, and mesh body can be used as the bag for forming the hanging tool, and it is easy to hang the rope at the lower end, and the bag can be easily manufactured. In addition, by setting the bag to a woven fabric, a non-woven fabric, or a net, the time scale of disassembly can be easily set by setting the thickness and the thread diameter.
Also, with the start of disassembly of the bag as a hanging tool, the natural stone is quickly discharged and the function as the weight is lost and disappears, and the weight disappears (drops out) easily and reliably and disappears (drops out). Since the weight is discharged into the sea as a natural stone, it does not harm the environment even if it stays in the sea, and is environmentally friendly.

In the invention according to claim 5, the weight body is a concrete lump and the hanging tool is a bag.
Since a concrete lump is used as the weight body, the weight of the weight can be arbitrarily set to a required weight.
Also, since the bag only wraps and holds the concrete block, any woven fabric, non-woven fabric, net, etc. can be used, it is easy to hang on the lower end of the rope, and the bag is easy to manufacture. In addition, by setting the bag to a woven fabric, a non-woven fabric, or a net, the time scale for decomposition can be easily set.
Also, as the bag begins to disassemble, the concrete mass is quickly discharged and its function as a weight is lost and disappears. The weight disappears easily and reliably, and the weight that disappears (drops) Because it is a lump, even if it stops in the sea after discharge, it is less likely to damage the environment and is environmentally friendly.

In the invention according to claim 6, the weight body is made of metal, and the hanging tool is a bag.
Since a metal, such as a steel ball, is used as the weight body, the weight of the weight can be arbitrarily set to a required weight.
In addition, since the bag only wraps and holds steel balls etc., any woven fabric, non-woven fabric, net, etc. can be used, it is easy to hang from the lower end of the rope, and the bag is easy to manufacture In addition, by setting the bag to a woven fabric, a non-woven fabric, or a net, the time scale for disassembly can be easily set.
Further, as the bag starts to be disassembled, the steel balls and the like are quickly discharged, the function as a weight is lost and disappears, and the weight disappears (drops out) easily and reliably.

In the invention which concerns on Claim 7, in any one of Claims 2-5, the bag was formed with the nonwoven fabric.
In particular, when the sand or gravel is stored in the bag, the contents can be securely held, and the production is easier than a woven bag or a net bag.
Further, by setting the thickness of the nonwoven fabric, the decomposition time can be easily set, and the holding time (period) of the weight body can be set and adjusted arbitrarily and easily.

In the invention according to claim 8, the hanging tool is a vertically long rod-like body, and a weight made of a metal or a concrete block is connected to the hanging tool.
A rod-like hanging tool is attached to the lower end of the rope, and a weight is connected to the hanging tool, so the time factor required for disassembling the rod-like hanging tool is to set the outer diameter of the rod-like body, etc. It is possible to adjust the time scale of decomposition easily.

In the invention which concerns on Claim 9, a hanging tool has a constriction part in the middle.
Since the rod-shaped hanger has a constricted portion, the setting of the temporal element required for disassembly is arbitrary by adjusting the outer diameter of the constricted portion, and the time scale of disassembly can be easily set.
Moreover, since the outer diameters of the upper and lower portions of the constricted portion are arbitrary, setting of the attachment portion to the rope and the attachment portion of the weight body is facilitated.

  In the invention according to claim 10, when the weight is made of a metal such as a gold steel ball, the weight is connected to a recovery rope, so that it is not possible to leave the steel ball or the like in the sea after the suspension is disassembled. Although not preferred, the steel balls and the like can be easily recovered after landing or after washing.

In the invention which concerns on Claim 11, the suspending tool was rope shape, and the weight was suspended by the rope suspending tool.
It is only necessary to connect a rope-like hanging tool with a weight suspended from a rope without producing a bag such as a nonwoven fabric, a woven fabric, or a mesh body. It is possible, and the hanging tool is rope-like, so it is easy to set the time (period) required for disassembling the hanging tool by setting the diameter of the twisted yarn, etc., and the time scale of disassembly can be set easily. .

It is explanatory drawing which shows an example of the scallop shell ear suspension culture apparatus as an example of drooping culture of a shellfish. It is explanatory drawing which shows the state which latched and held scallops to the vertical rope. It is explanatory drawing of the example which accommodated sand in the bag and used as the weight body, is a figure which accommodates sand in a bag, and is an example using a nonwoven fabric as a bag. It is a figure which shows the state which bound the bag after sand was accommodated in a bag, formed a weight body, and was suspended as a weight body at the lower end part of a rope. It is explanatory drawing of the example which accommodated the natural stone and the pebble in the net bag, and was made into the weight body, and is a figure which accommodates the natural stone and the pebble in the net bag. It is a figure which shows the state which tied the net bag after accommodating a stone, formed the weight body, and was suspended as a weight body in the rope lower end part. It is explanatory drawing of the example which accommodated the steel ball in the net bag and suspended it on the hook at the lower end part of the rope, and made it a weight body. It is explanatory drawing of the example which accommodated the natural stone in the net | network body, and was suspended from the hook at the lower end part of the rope, and was used as the weight body. It is a figure which shows the state which used the hanging tool as the rod-shaped body and suspended metal weights on the hanging tool. (A)-(c) is explanatory drawing which shows the process in which the rod-shaped hanging tool of FIG. 9 decomposes | disassembles. It is explanatory drawing which shows the example which used the concrete lump as a weight body. It is explanatory drawing of the example which made a part of rope in hanging culture the hanging part which consists of biodegradable plastics, and suspended the weight body. It is a figure explaining the state which a suspension part decomposes | disassembles from the state of FIG. 12, and a weight body remove | deviates from a rope. It is a figure which shows the modified Example of FIG. It is a figure explaining the example of the drooping culture by a multistage ridge (maru moth). It is a figure which shows the example of the drooping culture apparatus by a multistage ridge (maru persimmon). It is a figure which shows the example of the drooping culture apparatus by a multistage ridge (corner).

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a diagram for explaining an outline of an aquaculture device for scallop ear suspension culture as an example of drooping culture.
The aquaculture device 1 includes two anchor ropes 2, 2 driven into the seabed 9, a horizontal rope 3 (trunk) that is bound and stretched between the upper ends of the anchor ropes 2, 2, It consists of a plurality of vertical ropes 4 (... represents a plurality, the same applies hereinafter) suspended (suspended) at a predetermined interval in the length direction (lateral direction).
Exposed floating bodies 6 with the upper half exposed to the sea surface 10 are connected to the upper ends of the two anchor ropes 2 and 2 via connecting cords 5. Also, the exposed string 6 is connected by releasing the connecting string 5.
A plurality of floating bodies 8 that are held at a predetermined depth in the sea at predetermined intervals in the length direction (lateral direction) are connected to the horizontal rope 3 via connecting strings 7.

As described above, the vertical ropes 4 of the aquaculture device have a diameter of 6 to 8 mm and a length of 10 to 15 m, for example.
The vertical rope 4 has a predetermined pitch in the length direction (vertical direction), for example, a pitch of 100 to 130 mm, and penetrates the locking pins 11 in a direction perpendicular to the length direction of the rope so as to be spaced apart in the vertical direction. Hold.
The ear pieces 12a, 12a of the scallop larvae 12, 12 are pierced and held in the hook-like locking portions 11a, 11a at both ends of each locking pin 11 through the perforated ear suspension holes.

In this way, a plurality of vertical ropes 4 that hold and hold a number of juvenile shellfish at a predetermined pitch in the length direction (vertical direction of the suspended rope), and the horizontal rope 3 in the length direction (lateral direction) Are held at a predetermined pitch.
The lower ends of the vertical ropes 4 are floating at a distance from the seabed 9 without landing on the seabed 9.

The upper end portion is connected to the horizontal rope 3, and a large number of juvenile shells 12 are vertically locked and held at a predetermined pitch, and the weight body 20 is suspended from the lower end portions 4 a of the vertical ropes 4 suspended in the sea. .
When the weight body 20 is suspended from the vertical rope, the weight body 20 is not settled on the seabed 9, and a sufficient space is provided between the weight body 20 and the seabed 9.

FIG. 3 shows an example in which a biodegradable plastic hanging tool 21 is used as a bag. It is explanatory drawing of the example which accommodated the sand in the bag 21, and was used as the weight body, is a figure which accommodates the sand in the bag which is the hanging tool 21, and the raw material of a bag is a nonwoven fabric.
FIG. 4 is a view showing a state in which, after sand is stored in the bag 21, the bag 21 is bound to form the weight body 20, and is suspended as a weight body on the rope lower end portion 4a.
Although a bag is used as the weight suspension 21, the bag is formed of a biodegradable plastic material as described above.
Examples of the biodegradable plastic material include a microbial system, a chemical synthesis system, a natural product system, and a composite system thereof as described above.

Biodegradable plastics include “biopolyesters” and “bacterial cellulose” as microbial systems, “aliphatic polyesters”, “polyvinyl alcohol (PVA)” and “polyamino acids” as chemical synthesis systems. In “xanthone / cellulose”, “starch”, etc., in the composite system, the above blends and laminates.
In the embodiment, for example, the bag 21 as a hanging tool is formed of a water-soluble plastic, which is an example of a biodegradable plastic, for example, a nonwoven fabric of polyvinyl alcohol (PVA).

In a specific embodiment, the bag is formed of a biodegradable water-soluble plastic film or sheet.
A bag is formed with a film or sheet made of water-soluble plastic, and a weight is formed by accommodating a weight inside. If the material contained in the bag is sand, first, the amount of sand is adjusted. The weight of the weight body can be easily adjusted. Next, since it is sand, a film-like, sheet-like, particularly thin film-like bag is preferable because the fabric is not damaged.
In the case of a film-like bag, the bag mouth may have a zipper-like closing structure instead of the purse-like structure as will be described later with reference to FIGS.

In the illustrated embodiment, the closing structure is a bag structure such as a purse string in which a binding string 22 is hung around the mouth portion 21a of the bag 21 to bind it.
In FIG. 3, sand 23 is introduced and accommodated in the bag 21. The sand 23 is, for example, about 200 g to 1 kg, and the weight of the weight body 20 can be adjusted very easily by increasing / decreasing and adjusting the amount of sand contained.
Instead of the above sand, gravel may be used, or a mixture of sand and gravel may be used.

After the sand is stored in the bag 21, the mouth portion 21 a is tied and closed in the same manner as a drawstring, and the closed and long string 22 is bound and connected to the ring portion 4 b provided on the lower end portion 4 a of the rope 4. Then, the weight body 20 is suspended from the lower end portion of the rope 4.
This state is shown in FIG.
The sand 23 accommodated in the bag 21 becomes the weight of the rope 4, and the vibration of the rope due to waves and tidal currents can be suppressed as much as possible by the weight body 20, promoting the feeding activity of the scallops, and the growth of the scallops It can be promoted and realized.

In the weight body 20 described above, the bag body 21 is formed of a biodegradable water-soluble plastic woven fabric, non-woven fabric, sheet, or film. It is possible to make the period variable according to the purpose, and it is possible to obtain a hanging tool that meets the needs of the culture period.
Specifically, depending on the needs of the aquaculture period, for example, do you want the body to break down and drop off in 3 months, or do you want the body to fall off in 6 months and fall off the body in 10 months? There is a request such as whether you want to drop off or whether you want the weight to drop off after 12 months.

In the present invention, for example, it is possible to control the decomposition period by adjusting the thickness of the fiber or the thickness of the fabric.
Therefore, it is possible to select a preferred dropping period of the weight body according to the type and needs of the shellfish.

In this embodiment, the hanger 21 is a bag formed of a nonwoven fabric such as a water-soluble plastic sheet or film.
Therefore, as described above, the time required for disassembling the bag can be arbitrarily set by adjusting the thickness of the fabric of the bag.

After drooping culture, after a certain period of time, for example, in about 6 months, the larvae will be about 2 to 3 times larger, but at this point the need for weights is reduced, and even if the weights are removed, the entire rope The weight of the rope increases, and the weight of the rope itself functions as a weight, thereby reducing the influence of waves and tidal currents.
By the way, the hanging tool 21 for suspending the weight body 20 is a biodegradable plastic, for example, a biodegradable water-soluble plastic, for example, a bag made of polyvinyl alcohol non-woven fabric (film) in the illustrated embodiment. Over time, for example, about 6 months, it is decomposed into water and carbon dioxide by microorganisms (bacteria and bacteria).

As a result, the bag 21 which is a hanging tool is disassembled and collapsed, and sand constituting the accommodated weight flows out. As a result, the weight body collapses and the function of the rope 4 as a weight body is lost. It will be.
The sand is discharged (outflowed) into the sea by the collapse of the bag 21, but since the sand is a natural object, there is no environmental load.
Moreover, since the bag 21 which is a hanging tool is a biodegradable plastic, it decomposes into water, carbon dioxide, etc., and therefore does not become an environmental load even if it remains in the sea.

As described above, the hanging tool 21 does not remain as a weight at the lower end portion 4a of the rope 4 even if it is decomposed with time in the sea, and the rope lower end portion 4a becomes free.
Therefore, in the scallop drooping culture, for example, when the rope is wound up when removing, cleaning, or landing the shells in about 6 months, the weight at the end of the rope is removed and removed. Therefore, there is no effect on the scouring (harvesting work) by the washing machine, the hoisting machine, and the ear cut section.

As mentioned above, the weights are naturally disassembled over time and fall off the rope, so when using the weights in drooping aquaculture, cleaning operations and landing operations for removing shells Sometimes it is not necessary to remove the weight from the rope.
Therefore, drooping culture is carried out using the weight body, and the harvesting of fat scallops with good growth is realized, while the removal of foreign matters attached to the shells, the cleaning work and the harvesting work at the time of landing are facilitated and accelerated. Can be achieved.

FIG. 5 shows a case in which a net bag 31 is used as a hanging tool made of biodegradable plastic. It is explanatory drawing which accommodated the natural stone and the pebble in the net bag 31, and was used as the weight body 30, and is a figure which accommodates the natural stone and the pebble in the net bag 31.
FIG. 6 shows a case in which natural stones and pebbles are housed in the net bag 31, and the straps 32 of the net bag 31 are tied and closed in the same manner as in FIG. It is a figure which shows the state which connected the binding string 32 to the lower end part 4a, and was suspended as the weight body 30.

In this embodiment, a mesh bag is used as the hanging tool 31, and the mesh (mesh size) is small because it is an example using pebbles in the embodiment.
Similar to the above-described embodiment, the binding portion 32 is hung around the mouth portion 31a of the net bag 31 which is a hanging tool to form a bag structure like a drawstring.
FIG. 5 shows an example in which a large natural stone 33 and a plurality of pebbles 34... By the way, the natural stone 33 is uneven in weight, and may not be sufficient for the required weight. Therefore, pebbles 34 are mixed and adjusted to the required weight.
Therefore, adjustment of the weight of the weight body 30 is easy.

After storing the natural stone 33, the pebbles 34,... In the net bag 31, the mouth portion 31a is closed in the manner of a purse string, and the looped portion 4b provided with a closed and elongated binding string 32 on the lower end portion 4a of the rope 4 The weight body 30 is suspended from the lower end portion of the rope 4.
This state is shown in FIG.
In this embodiment, since the hanging tool 31 is a net bag, the time (period) required for disassembling the net bag body can be adjusted by appropriately selecting the thickness of the yarn knitting the net bag. It is possible to set arbitrarily.

7 and 8 are examples in which a net bag is used as a biodegradable plastic hanging tool.
It is explanatory drawing of the example which accommodated the steel ball through the mesh body in the hook connected with the rope lower end part, and was suspended via the hook at the rope lower end part as a weight body (FIG. 7), and was also natural in the mesh body. It is explanatory drawing (FIG. 8) of the example which accommodated the stone and suspended it via the hook at the lower end part of the rope, and made it the weight body.

In FIG. 7, a steel ball 43 is accommodated in a mesh bag 41 made of biodegradable plastic, and the mouth portion of the mesh bag 41 is hooked on a hook 42 connected to a lower end of a rope (not shown), suspended and held, and a weight body 40. Is formed.
The steel ball 43 needs to be recovered from the sea after the net bag 41 is decomposed over time. For this reason, the recovery rope 44 is connected to the steel ball 43, and the weight body 40 made of the steel ball is recovered after dropping from the rope.

In FIG. 8, a natural stone 45 is accommodated in a net bag 41 made of biodegradable plastic, the mouth portion of the net bag 41 is hooked on a hook 42 connected to a lower end of a rope (not shown), suspended and held, and a weight body 40. Is formed.
The natural stone 45 accommodated in the net bag 41 is discharged into the sea after the net bag 41 is decomposed over time, but since it is a natural stone, it does not affect the environment even if it is left on the seabed.

FIG. 9 shows an embodiment in which a biodegradable plastic hanger is a rod-shaped body.
The hanging tool is made of the above-described biodegradable plastic, and the hanging tool 51 is formed of a rod-shaped body.
The suspending tool 51 is cylindrical and has a length, and a narrowed portion 52 is formed at an intermediate portion in the length direction, and is used so that the length direction forms a vertical direction.

A hook 53 to be engaged with the ring portion 4b of the lower end portion 4a of the rope 4 is embedded in the upper end portion of the hanger 51, and a hook 54 is embedded in the lower end portion to form a trapezoidal or frustoconical metal. A hook 56 provided on the upper surface of the weight 55 is engaged with a hook 54 extending below the suspension 51 to constitute a weight body 50.
A locking ring 57 of a recovery rope 58 is provided on a part of the side surface of the metal weight 55.

(A)-(c) of FIG. 10 is explanatory drawing which shows the process in which the above-mentioned biodegradable plastic rod-shaped hanging tool 51 decomposes | disassembles.
As described above, the rod-like hanging tool 51 is decomposed in the sea with the passage of time. However, since the rod-like hanging tool 51 has a narrowed portion 52 formed in the middle portion, the rod-like hanging tool 51 shown in FIG. From the state, the portion of the constricted portion 52 proceeds rapidly as shown in (b). Finally, as shown in (c), the portion of the constricted portion 52 is broken as shown in 52a and 52b, and a metal weight 55 is obtained. Is separated from the lower end 4a of the rope 4 and falls off.
In this way, by providing the constriction 52 in the middle part of the rod-like hanging tool, it acts like a fuse, and by setting the length and outer diameter of the constriction 52, the weight drop due to disassembly of the hanging tool It is possible to arbitrarily set the time (period).
Since the weight is made of metal, it is recovered by the recovery rope 58 after the fact.

FIG. 11 is an explanatory view showing an example in which a concrete lump is used as a weight body. A weight 61 is formed of the concrete lump, a hook 66 is embedded in the weight 61, and the hanger 51 is hung below the hanging tool 51. It is locked to the hook 54. The weight body 60 is formed of a concrete block, and the other structure is the same as that of the embodiment of FIG.
In this embodiment, since the weight body 60 is a concrete lump, it does not become an environmental load even if it is left in the sea.

FIG. 12 is an explanatory diagram of an example in which a part of a rope in the drooping culture is a hanging part made of biodegradable plastic and the weight is hung.
In this embodiment, a rope-like hanging tool (hanging part) 71 made of biodegradable plastic is formed on a part of the lower end part of the above-mentioned vertical rope that suspends and holds the juvenile with a locking pin in hanging culture. It is a thing.
In the present embodiment, the hanging tool 71 is configured with a part of the ring portion 4b formed on the lower end portion 4a of the rope 4 as a hanging portion made of biodegradable plastic.

When the hanger 71 forms the ring portion 4b at the lower end of the rope 4, a part of the ring portion 4b is formed by weaving a biodegradable plastic thread, and in particular, the lower half of the ring portion 4b. The U-shaped part of the part 4c is composed of a twisted yarn knitted with biodegradable plastic to form a U-shaped hanging tool (suspended part) 71.
In the embodiment, a metal ring 74 called thimble is held in the ring of the ring part 4 b of the rope 4, and a hook 73 protruding from the upper surface of a metal weight 72 is locked to the metal ring 74. The weight 70 made of metal is held by the hanging tool 71.

FIG. 13 is a diagram illustrating a state in which the hanging tool is disassembled from the state of FIG. 12 and the weight body is detached from the rope.
As described above, the biodegradable plastic hanger 71 (hanging part) provided on the lower half 4c of the ring part 4b of the lower end part 4a of the rope 4 is disassembled over time, and the ring part 4b The lower half 4c collapses and breaks.
Thereby, the weight body 70 formed of the metal weight 72 is detached by the hook 73 and the metal ring 74 being detached from the lower end of the rope. This state is shown in FIG.
The weight body 70 is collected by a rope 75.

FIG. 14 is a diagram showing a modified embodiment of the embodiment of FIG.
In this embodiment, a joint portion 81 made of a biodegradable plastic is provided between the lower portion 4d and the lower end portion 4a of the rope 4 so as to constitute a part of the rope.
The joint portion 81 constitutes a biodegradable plastic suspension that decomposes in water over time.
In the embodiment, the joint portion 81 made of biodegradable plastic is integrally provided so as to form a part of the rope. However, the joint portion 81 is separated from the rope 4, and the lower portion 4d of the rope 4 and the weight body are suspended. The lower end 4a to be lowered may be connected.

In the present embodiment, since the other configuration is the same as that of the embodiment of FIG. 12, the same portions are denoted by the same reference numerals and description thereof is omitted.
The joint portion 81 at the bottom of the rope 4 is disassembled after a lapse of a predetermined time in the same manner as described above, and the lower portion from the joint portion 81 falls off together with the weight body 70 and the metal ring 74.
As a result, the rope 4 is released from the weight body 70.

In the above, the embodiment in which the scallop shell culture is suspended from the rope suspended in the sea via the locking pin has been described, but the present invention can be implemented in other hanging culture.
FIGS. 15 to 17 show drooping culture of shellfish using a multi-stage kite, FIG. 15 is a diagram illustrating an example of multi-stage drooping culture using a round kite, and FIG. 16 is a diagram illustrating an example of the drooping culture device. It is.
A multi-stage eave 94 is formed by stacking and connecting round eaves 93 in which the receiving surface 91 and the peripheral frame 92 are formed of a net-like enclosure in multiple stages. The multi-stage rod 94 is held at a suitable position on the outer periphery by a plurality of hanging ropes 95, and the upper ends of the hanging ropes 95 are squeezed and bundled. As shown in FIG. The plurality of multistage housings 94 are suspended in the sea by being connected and suspended by 96 or the like.

As in FIG. 1, the horizontal rope 3 is supported at a plurality of locations on the floating bodies 8 through the connecting strings 7. Further, the horizontal rope 3 is supported at appropriate positions on the exposed floating bodies 6 through the connecting strings 5. The horizontal rope 3 is held at a depth.
The lower part 95a of the suspension rope 95 is extended below the lowermost part of the multistage casing 94, and the weight body 90 is suspended and held via the suspension member 97 formed of the above-described biodegradable plastic at the lower end part 95b. To do.
The suspension 97 is, for example, a bag formed of a polyvinyl alcohol (PVC) non-woven fabric as described above, and forms a weight body 90 by containing sand, gravel, or the like. The weight body is optional.

Each sword 93 of the multi-stage scabbard 94 is loaded with scallops and other larvae and is cultivated and grown in the sea. Vibrations due to tidal currents and the like are suppressed as much as possible, contact between shells caused by vibrations is prevented as much as possible, feeding progresses, and good growth of shellfish can be obtained.
After the elapse of a predetermined period, the hanging tool 97 is disassembled, the weight body is dropped off, and the multistage rod is released from the weight body.

FIG. 17 is a diagram showing an example of multi-stage trout culture with hornworms.
In this embodiment, the ridges are made into a square dish shape, and the ridges 193 are stacked in multiple stages to form a multistage ridge body 194, and the larvae are accommodated and cultured in the respective ridges 193 as described above. .
The weight body 90 was suspended and held at the lower end portion of the suspension rope 195 of the multistage housing 194 via a suspension 97 formed of biodegradable plastic in the same manner as described above.

  In the above-described embodiments, examples of scallop drooping culture have been described. However, the present invention can be applied to drooping culture of various shellfish such as rock oyster ear-hanging culture and scallop drooping culture.

  The present invention can be used for hanging culture of various shellfish.

DESCRIPTION OF SYMBOLS 1 ... Droop culture apparatus, 4 ... Rope, 12 ... Scallop larvae, 20, 30, 40, 50, 60, 70, 90 ... Weight body, 21, 31, 41, 51, 71, 81, 97 ... Biodegradation sex plastic made of hanger, 23 ... sand, 33, 45 ... natural stone, 43,55,72 ... metal weight.

Claims (11)

In the drooping culture device for shellfish that hangs ropes and sea breams in the sea and keeps the larvae in the ropes and sea breams,
A weight is suspended by a hanging tool at the lower end of the rope or the lower end of the rod of the hanging culture device,
The suspension is formed of biodegradable plastic,
Shell culture device characterized by that. The shell culture apparatus according to claim 1, wherein the weight body is sand and / or gravel, and the hanging tool is a bag. 3. The shellfish hanging culture apparatus according to claim 2, wherein the bag is made of a biodegradable water-soluble plastic sheet or film. The shell culture apparatus according to claim 1, wherein the weight body is a natural stone, and the suspension tool is a bag. 2. The shell culture apparatus according to claim 1, wherein the weight body is a concrete lump, and the suspension tool is a bag. The shell culture apparatus according to claim 1, wherein the weight is made of metal, and the hanging tool is a bag. The shell culture apparatus according to any one of claims 2 to 5, wherein the bag is formed of a nonwoven fabric. The shell hanging culture apparatus according to claim 1, wherein the hanging tool is a vertically long rod-like body, and a metal or concrete block weight is connected to the hanging tool. 9. The shell hanging culture apparatus according to claim 8, wherein the hanging tool has a constricted portion in the middle thereof. 9. The shell drooping culture apparatus according to claim 6, wherein a recovery rope is connected to the weight body. The shell hanging culture apparatus according to claim 1, wherein the suspension is rope-shaped, and a weight is suspended from the suspension.

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