JP2016007173A - Seaweed culturing rope and method for using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seaweed culturing rope which makes it easy to perform the operation of holding a seaweed seedling between the strands of the rope and to provide a method for using the rope.SOLUTION: A seaweed culturing rope 10 is made by braiding or twisting non-elastic strands 11, 12 which does not show elasticity and an elastic strand 13 which shows moderate elasticity. Six non-elastic strands and one elastic strand are used, and two of the six non-elastic strands make up a unit to obtain three units and the one elastic strand makes up a unit. The rope is made by twisting four strands consisting of three units of the non-elastic strands 31, 32, 33 and one unit of the elastic strand 34. A method for using the seaweed culturing rope includes: stretching the elastic strand to form a gap between the elastic strand and the non-elastic strands; and inserting a part of a seaweed seedling to be cultured into the gap and then holding the seaweed seedling between the elastic strand and the non-elastic strands by the elastic force of the elastic strand.

Description

  The present invention relates to a rope used for aquaculture of seaweeds and a method for using the rope.

  Seaweed culture methods can be broadly classified into the prop type and floating type. The prop type is a method that is used in relatively shallow water, and the height of the aquaculture rope is increased due to fluctuations in the sea level by using props that stand on the seabed at appropriate intervals and pierce the floating ring through the prop. It is configured to change. On the other hand, the floating method is a method adopted in a deep water place, and the outer frame is composed of ropes and the like, and the aquaculture rope is connected within the frame. It is to be cultivated in.

  By the way, the rope for aquaculture used here was a rope formed by twisting three strands called a three-strand rope. And the gap | interval was formed by returning the twist of this rope, and the operation | work which inserts the seedlings of the seaweed used as aquaculture object in this gap | interval (this is called pinching) was performed (refer nonpatent literature 1). Although Non-Patent Document 1 is a report on hinoki, it is thought that the same method is adopted as long as it is a seaweed cultivated from a seedling.

Oita Prefectural Agriculture, Forestry and Fisheries Research Center Research Report (Fisheries Research Department) No. 3 (2013) P21-P56

  The content disclosed in Non-Patent Document 1 described above is a study of the aquaculture state of seaweeds exclusively. The aquaculture rope used there is 12 strands made of polypropylene (4 strands of 1 thread). The strand was made by twisting three strands, and a strand called a three-strand rope) was used. And as long as the photograph published in the said literature P26 is seen, it can be judged easily that it is a general triple twist rope.

  However, when the seedlings are sandwiched in a general three twisted rope, a gap is formed by returning the twisting of the rope as described above, and the seedlings are sandwiched in the gap and then twisted again. It was necessary and everything was done manually because of the fineness of the work. This work is very time consuming and labor intensive, and the above document describes that it takes 2 hours and 30 minutes even if two people work when sandwiching seedlings at intervals of 5 cm on a 40 m rope. (See P25 of the same document).

  The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an aquaculture rope capable of simplifying the sandwiching operation and a method for using the same.

  Therefore, the present invention relating to a seaweed aquaculture rope is characterized by braiding or twisting a non-stretchable strand that does not exhibit stretchability and a stretchable strand that exhibits moderate stretchability.

  According to the above configuration, a single aquaculture rope has strands having different properties (stretchable and non-stretchable), and the stretchable strand is made to be stretchable with respect to the non-stretchable strand. be able to. And, for example, when a three-strand rope is constituted by two non-stretchable strands and one stretchable strand, the one stretchable strand exists in a spiral shape on the rope surface. A gap can be formed between the stretchable strand and the non-stretchable strand by appropriately stretching the stretchable strand. In addition, when it is braided or twisted as four strikes (in the case of a normal rope, two twists in one pair, called a so-called cross rope), a stretchable strand is used for either As a result, the stretchable strands regularly pass through the rope surface, and a gap can be formed by stretching the stretchable strand passing through the surface.

  Here, in the invention of the above configuration, six non-stretchable strands and one stretchable strand are used, and the two nonstretchable strands are set as three sets, and one stretchable strand is set as one set. The rope may be formed by striking the three sets of non-stretchable strands and one stretchable strand.

  In such a configuration, the strength is ensured by three sets of non-stretchable strands, and one stretchable strand can function as a seedling fixing. The twisted state in this case can be the same as that of a so-called cross rope since four pairs of strands are used. In the case of braiding or twisting similar to a cross rope, the stretchable strand penetrates the inside of the rope like other strands and regularly passes through the surface of the rope, and is positioned by the penetration portion inside the rope. Can be fixed, and a portion passing through the surface can be stretched to form a gap.

  The stretchable strand of each of the above inventions can be composed of a twisted yarn using an elastic fiber yarn made of synthetic resin, and a polyurethane yarn can be used as the elastic fiber yarn.

  If it is a twisted yarn using an elastic fiber yarn made of synthetic resin, it can be used for a long time in seawater, and if an elastic fiber yarn made of polyurethane is used, it can be expected that the stretchability will be sustained.

  On the other hand, the present invention according to the method for using the seaweed aquaculture rope as described above, stretches the stretchable strand to form a gap with the non-stretchable strand, and the seaweed seedlings to be cultured in the gap The seedlings are sandwiched by the elastic force of the stretchable strands after part of the seeds are invaded.

  According to the above configuration, the stretchable strand can sandwich the seedlings of seaweed by exerting an elastic force from its stretchability. That is, the gap can be formed by stretching by an artificial external force, and the extensible strand contracts by the disappearance of the external force, thereby acting to reduce the gap. The seedlings are held by reducing the gap. When harvesting or removing, the gap can be enlarged by applying an artificial external force again.

  According to the present invention relating to a seaweed aquaculture rope, the non-stretchable strand constitutes a rope having strength, and since some of the strands forming the rope are stretchable strands exhibiting stretchability, the stretchable Seeds and seedlings of seaweeds to be cultured can be easily sandwiched between the strands. That is, by stretching the stretchable strand exposed on the rope surface, an appropriate gap can be formed between the stretchable strand and the non-stretchable strand, and seaweed seedlings to be cultured can be inserted into the gap. . Further, by contracting the stretchable strand by the elastic force of the stretchable strand, the seedling inserted in the gap is sandwiched by an appropriate pressing force, and the seedling is sandwiched by this clamping. It can be done. Therefore, it is possible to pinch very easily as compared with the conventional case where the twist is returned to form a gap and the rope is twisted again after inserting the seedlings.

  In addition, when using one strand of a triple twist rope as an expansion / contraction strand, since an expansion / contraction strand is arrange | positioned helically around a rope, a seedling can be inserted | pinched in the arbitrary positions on the rope surface. In addition, when one set (two sets of one set or one set of one set) of cross ropes formed by four sets of four sets is used as an expandable strand, the expandable strand is ruled while penetrating the inside of the rope. Since it can be in a state of passing through the rope surface, it is possible to sandwich seedlings at appropriate intervals using this regular surface portion. And it is also possible not only to twist these, but to stretch-stretch one set or two sets of 6 or 8 sets of ropes.

  Furthermore, a general rope used for aquaculture such as seafood is composed of non-stretchable strands made of synthetic fibers such as polypropylene or polyethylene, and can be used in seawater for a long time. Therefore, by making the stretchable strands made of synthetic fibers such as polyurethane, it can be used for a long time in seawater as a whole. Accordingly, ropes made of these materials can be used repeatedly, and can be used as artificial reefs if they are left in the sea with the seaweed roots remaining after harvesting.

  On the other hand, according to the present invention relating to the method of using the aquaculture rope, a tensile force can be applied to the stretchable strand to temporarily stretch it, thereby forming a gap for sandwiching the seedlings. After inserting the seedlings into the shell, the sandwiching operation can be completed by removing the tensile force.

It is explanatory drawing which shows embodiment of this invention which concerns on the rope for seaweed culture. It is explanatory drawing which shows the usage condition of embodiment of this invention which concerns on the rope for seaweed culture. It is the photograph of the state which pinched the hinoki seedling as an experiment example. It is a photograph which shows the state of the cypress cultured as an experiment example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows three types of embodiments. FIG. 1 (a) shows a triple twisted rope (first embodiment), FIG. 1 (b) shows a four-strike cross rope (second embodiment), and FIG. 1 (c). ) Shows one set of four crossed ropes as one strand (third embodiment).

  First, the first embodiment is a three-stranded rope 10 composed of three strands 11, 12, and 13, as shown in FIG. 1 (a). Among the three strands 11, 12, and 13 constituting the rope 10, one (colored in the drawing) strand 13 is used as a stretchable strand exhibiting stretchability. The remaining two strands 11 and 12 are general non-stretchable strands that do not exhibit stretchability.

  The non-stretchable strands 11 and 12 are formed by spinning a synthetic fiber made of polypropylene and bundling a plurality thereof. On the other hand, the stretchable strand 13 is a yarn using a synthetic fiber made of polyurethane.

  Here, exhibiting stretchability indicates a remarkable elongation (strain) in the tensile direction when subjected to a tensile load, and indicates a restoring force against the elongation (strain) due to the tensile load. It means the property that can be shrunk by restoring force. In the following, the restoring force when receiving a tensile load may be referred to as an elastic force. Moreover, not exhibiting stretchability means the property of not exhibiting significant elongation when subjected to a tensile load. Strictly speaking, it shows a slight elongation (strain), meaning that even if it may be plastically deformed or elastically deformed, its elongation rate is extremely small.

  Therefore, the aquaculture rope 10 of the present embodiment is formed by twisting two non-stretchable strands 11 and 12 and one stretchable strand 13 into three strands. In a parallel state, they are twisted together in a spiral shape. Accordingly, the one stretchable strand 13 is arranged in a spiral shape on the surface of the rope 10 while having an interval corresponding to the diameter of the two non-stretchable strands 11 and 12.

  Since this embodiment is the above structures, the elastic strand 13 continuous in the length direction of the rope 10 can be arrange | positioned, and the elastic strand 13 can be used in arbitrary positions. The use of the stretchable strand 13 is to artificially stretch the stretchable strand 13 to form an appropriate gap between the nonstretchable strands 11 and 12 as will be described later.

  Next, a second embodiment will be described. As shown in FIG. 1 (b), the present embodiment is an aquaculture rope 20 configured as a cross rope formed by striking four sets of 21, 22, 23, and 24 with a set of two strands. is there. Of the sets 21 to 24, the non-stretchable strands 21a, 21b, 22a, 22b, 23a, and 23b are used for the three sets 21 to 23, respectively, and the remaining one set 24 (colored in the figure) is a stretchable strand. 24a and 24b are used. These non-stretchable strands 21a-23b are made of synthetic fibers made of polypropylene as in the first embodiment, and the stretchable strands 24a, 24b are made of synthetic fibers made of polyurethane. It is.

  Thus, by making the four sets 21 to 24 using the strands of both properties into a four-strike cross rope, the stretchable strands 24a and 24b are braided while intersecting with the other strands 21a to 23b. Then, while passing through the inside of the rope 20 after braiding, it partially passes through the surface (exposed to the surface). The region passing through the surface is regular according to the state of the braid. In addition, when braiding as a cross rope as in the present embodiment, the stretchable strands 24a and 4b that regularly pass through the surface are positioned on both sides that are symmetrical about the axis of the rope 20. In addition, on one surface exposed symmetrically, the stretchable strands 24a and 24b of the exposed portion are continuous in a direction inclined with respect to the axial direction of the rope 20, and the continuous portion is in the axial direction. Will be formed intermittently in the same state.

  Accordingly, when sandwiching seaweed seedlings, the seedlings can be fixed in a line along the axis of the rope 20 by using the same stretchable strands 24a, 24b. In addition, since a large number of seedlings are sandwiched, naturally adjacent seedlings should be fixed with a space between each other, if a regular continuous part of the stretchable strands 24a and 24b passing through the surface is used, Seeds and seedlings can be sandwiched at almost equal intervals.

  In the present embodiment, the two stretchable strands 24a and 24b are paired to form a cross rope, so that the two stretchable strands 24a and 4b are basically arranged in parallel. It will be. Thus, when seaweed seedlings are sandwiched, they may be sandwiched by only one of the two stretchable strands 24a and 24b, or may be sandwiched by only one of them.

  Further, when the cross rope is braided by these strands 21a to 24b, an appropriate tension is applied. Therefore, the tension is also applied to the stretchable strands 24a and 24b. It is in a state of being braided in a stretched state. Therefore, the stretchable strands 24a and 4b exert an elastic force so as to be in close contact with the surface of the rope 20 at the time of rope formation, and can exert a pressing force necessary for sandwiching seaweed seedlings. It is in a state.

  Next, a third embodiment will be described. This embodiment is a modification of the second embodiment described above. As shown in FIG. 1 (c), basically, four sets 31, 32, 33, 34 are formed by four strokes. The cross rope 30 is formed. The same applies to the three sets 31 to 33 of the four sets 31 to 34, in which the non-stretchable strands 31a, 31b, 32a, 32b, 33a, and 33b are used. This embodiment is different from the second embodiment in that the remaining set 34 (colored in the drawing) is configured by only one stretchable strand 34. Accordingly, one stretch strand 34 is regularly and intermittently exposed on the surface of the rope 30, and the one stretch strand 34 can be used to sandwich seaweed seedlings. It is.

  Thus, when one stretch strand 34 is made into one set, the strength (particularly tensile strength) of the rope 30 is obtained by the remaining three sets 31 to 33, and the stretch strand 34 is supported by these. It becomes. Further, since the stretchable strand 34 is braided while intersecting with the non-stretchable strands 31a to 33b constituting the above three sets 31 to 33, the stretchable strand 34 is integrated with the rope 30 in a region penetrating the inside of the rope 30. In addition, a region that can be stretched by a portion passing through the surface can be formed. Accordingly, the stretchable strands 34 are arranged so as to sew the inside and outside of the tough rope.

  In the third embodiment having such a configuration, as in the second embodiment, the stretchable strands 34 that regularly pass through the surface are located on both sides that are symmetric about the axis of the rope 30. Become. And the part which passes the surface will continue in the direction inclined with respect to the axial direction of the rope 30, and will be formed intermittently in the axial direction. Therefore, by using the stretchable strands 34 exposed on the surface at such regular intervals, it is possible to sandwich the seedlings at substantially equal intervals.

  Next, an embodiment of the present invention related to a method of use will be described together with a usage pattern of each of the above embodiments. Since the embodiment of the present invention relating to the seaweed aquaculture rope has the above-described configuration, by stretching the stretchable strand that forms the rope together with the non-stretchable strand, a gap is formed, and seedlings are seeded in the gap. It can be inserted. Then, the usage method of the above-mentioned aquaculture ropes 10, 20, and 30 will be sequentially described with reference to FIG. 2A is the aquaculture rope 10 of the first embodiment, FIG. 2B is the aquaculture rope 20 of the second embodiment, and FIG. 2C is the aquaculture rope of the third embodiment. The use state of each of the ropes 30 is shown.

  First, as described above, the rope 10 of the first embodiment is in a state in which the stretchable strand 13 is arranged in a spiral shape on the surface of the rope 10, so that the rope 10 can be stretched at an arbitrary position in the axial direction of the rope 10. The strand 13 can be stretched. At this time, as shown in FIG. 2 (a), gaps A1, A2, and A3 can be formed between the non-stretchable strands 11 and 12 by pulling the stretchable strand 13 outward. . By inserting the seedlings into the gaps A1, A2 and A3 and releasing the stretched state, the stretchable strand 13 contracts and the seedlings can be held between the non-stretchable strands 11 and 12.

  When the stretchable strand 13 is stretched at any position in the axial direction of the rope 10, the circumferential position of the rope 10 varies depending on the spiral state of the stretchable strand 13. When the seedlings are clamped linearly along the axis, the seedlings are clamped at intervals corresponding to the spiral state of the stretchable strand 13.

  When using the rope 20 of the second embodiment, as shown in FIG. 2 (b), two parallel stretchable strands 24a and 24b forming a pair 24 are simultaneously stretched, and the two In addition to inserting seedlings into the strands 24a, 24b at the same time, only one strand 24a may be stretched and held between the strands 24a. In either case, by inserting seaweed seedlings into the gaps B1, B2 and B3 formed by stretching and releasing the stretching, the stretchable strands 24a and 4b contract, and the nonstretchable strand 21a. The seedlings can be sandwiched between ˜23b (optionally together with the remaining stretchable strands 24b).

  Furthermore, when using the rope 30 of the third embodiment, as shown in FIG. 2 (c), by stretching a single stretchable strand 34, gaps C1, C2 due to the stretch are formed, This gap can be used to hold seedlings of seaweeds.

  Here, when the ropes 20 and 30 of the second and third embodiments are used, the portions where the stretchable strands 24 and 34 are exposed on the surfaces of the ropes 20 and 30 are limited as illustrated. Therefore, this exposed portion is selected to hold seaweed seedlings. Since the limited exposed portion is intermittently and regularly formed in the axial direction of the ropes 20 and 30 as described above, for example, the exposed portion formed on the same side as shown in the figure. And regularly selecting the exposed part to be used (for example, excluding the middle one), the distance between adjacent seedlings can be made substantially constant. .

  As shown in the above example, when the seedlings are clamped linearly with respect to the axial direction of the ropes 20 and 30, the stretchable strands 24a, 24b and 34 arranged on the same side of the ropes 20 and 30 are extended in the same direction. Therefore, the pinching operation can be simplified. However, when a sparse / dense state should be considered according to the state of growth of the seaweed to be cultivated, it is also possible not to be held at the regular positions as described above. As a matter of course, the seedlings may be clamped by all the exposed portions, or may be clamped by irregularly selected exposures. In short, if the stretchable strands 24a, 24b, and 34 are exposed portions on the surfaces of the ropes 20 and 30, the seedlings can be held by stretching them.

  As described above, after the seaweed seedlings are sandwiched between the ropes 10, 20, and 30 of the respective embodiments, the ropes are installed in the sea by a column type or a floating type. At present, as the method for culturing seaweeds, a prop method and a floating method are mainly used, but if there is a culture method by other methods, it may be used for that method.

  Then, after the seaweeds have been installed in the sea during the period of growth, the cultured algae are cultivated by pulling up the aquaculture ropes 10, 20, 30 and excising from the vicinity of the sandwiched portion or releasing the sandwich. You can harvest varieties. The surface of seaweeds may be washed by spraying seawater pressurized at the time of harvesting.In this case, seawater can be easily ejected without detaching seaweeds by spraying seawater while seedlings are sandwiched. Can be washed.

  Furthermore, for example, when seaweed is excised in the vicinity of the sandwiching portion, the portion left by the excision (root portion) is maintained in a state of being sandwiched by the stretchable strands 13, 24a, 24b, and 34. Therefore, seaweed may grow from the root portion again by leaving the root portion and returning it to the sea again. Therefore, in this way, it is also possible to repeatedly cultivate using the same seedlings. In addition, when this kind of seaweed that grows again is not collected for food, the ropes 10, 20, and 30 with root portions remaining may be used as artificial reefs.

  The embodiments of the present invention are as described above, but these show examples of the present invention and are not intended to limit the present invention. Therefore, it is possible to change the said embodiment suitably. For example, the configuration of the rope illustrated as an embodiment is limited to three twisted ropes 10 and cross rope ropes 20 and 30, but is not limited thereto, and other ropes may be used as long as the strands are twisted together. It can also be used for various types of ropes. Moreover, although the thread | yarn by a polypropylene fiber was used for the non-stretchable strand and the thread | yarn by a polyurethane fiber was used for the elastic | stretch strand, it will not be limited to these as long as it exhibits a stretching property or a non-stretching property. Although natural fibers may be used, it is preferable to use synthetic fibers when considering long-term use in the sea.

  Next, the actual use state in the sea was tested. The rope used in the experiment is the rope 30 shown as the third embodiment, which uses a single stretch strand 34 and is a four-strike cross rope. The stretchable strand 34 is a strand having a stretchability of braided strands made of polyurethane fibers and having a diameter of about 2 mm, and the non-stretchable strands 31a to 33b are three twisted yarns made of polypropylene fibers. A twisted yarn having a diameter of about 3 mm was used. Then, the seedlings were held by all of the exposed portions on one side that were intermittently exposed along the axis of the rope 30. In addition, the seaweed used for experiment was hijiki, and seedlings and seedlings were used after the spores were grown on a coral-like landing member. This clamping state is shown in FIG.

  The rope 12mm with the seedlings sandwiched as described above was cultivated in Ise Bay for 6 months by the floating method, and then pulled up. The seedlings were sandwiched between the ropes 30 without detaching, and the hinoki was growing sufficiently. confirmed. The state at that time is shown in FIG. As is apparent from the states of FIGS. 3 and 4, it was confirmed that rainbow trout can be cultivated with the rope of this embodiment.

10, 20, 30 Aquaculture ropes 11, 12 Non-stretchable strands constituting the aquaculture rope (first embodiment) 13 Stretchable strands 21a, 21b, 22a, 22b constituting the aquaculture rope (first embodiment) , 23a, 23b Non-stretchable strands 24a, 24b constituting the aquaculture rope (second embodiment) Elastic strands 31a, 31b, 32a, 32b, 33a, 33b constituting the aquaculture rope (second embodiment) Non-stretchable strands 24 constituting the rope for farming (third embodiment) Stretchable strands constituting the rope for aquaculture (third embodiment)

Claims (5)

  A seaweed aquaculture rope characterized by braiding or twisting a non-stretchable strand that does not exhibit stretchability and a stretchable strand that exhibits moderate stretchability.   For each of the six non-stretchable strands, one stretchable strand is used, and the two nonstretchable strands are grouped into three sets, and the three sets of nonstretchable strands and one stretchable strand are divided into four. The rope for aquaculture of seaweed according to claim 1.   The rope for seaweed cultivation according to claim 1 or 2, wherein the stretchable strand is a twisted yarn using an elastic fiber yarn made of synthetic resin.   4. The seaweed aquaculture rope according to claim 3, wherein the elastic fiber yarn constituting the stretchable strand is made of polyurethane.   The method for using the seaweed culture rope according to any one of claims 1 to 4, wherein the stretchable strands are stretched to form a gap with the non-stretchable strands, and the seaweed to be cultured in the gap A method for using an aquaculture rope, comprising: invading a part of the seedling and seedling and then holding the seedling by the elastic force of the stretchable strand.