JP2018186809A - Culture system and culture method of algae - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system that effectively prevents biting damage of cultured algae by algae-eating fish in culturing algae.SOLUTION: An algae culture system 10 comprises: (a) at least one algae holding member 6; (b) a supporting member which supports the algae holding member 6 such that at least one algae holding member 6 is arranged on a water surface 8 or in the vicinity thereof in a fish farm; and (c) a biting damage preventive net 7 which prevents biting damage of algae by algae-eating fish 18 in the fish farm, in which the biting damage preventive net 7 is arranged so as to cover at least one algae holding member 6 from below in the fish farm, the biting damage preventive net 7 and the algae holding member 6 are arranged apart from each other to a degree where algae growing on the algae holding member 6 do not suffer biting damage by the algae-eating fish 18, and the biting damage preventive net 7 is constituted of a mesh with 5.5 cm to 19 cm of a mesh size. A production method and a cultivation method of algae include culturing algae by using the algae culture system 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an algae culture system and a culture method.

  Examples of fish that damage algae include omnivorous black sea bream, algal edible isuzumi, medina, and aigo. In recent years, in the seaweed farms such as Tokyo Bay, the number of black sea bream, medina, aygo, etc. has increased rapidly, and the damage caused by these fish has been enormous in the seaweed farming.

  As means for preventing damage to cultured algae caused by such fish, for example, a nori culture tool (culture system) 200 as shown in FIGS. 7A and 7B is known. The tool is mainly used in the Seto Inland Sea where the water is relatively deep.

  FIG. 1 is a top view of the farming tool of Embodiment 1 of the present invention, but when the conventional farming tool 200 shown in FIGS. 7A and 7B is also seen from the top, FIG. The form is as shown. When it is assumed that the farming tool shown in FIG. 1 is the conventional farming tool 200, the structure shown in FIG. The structure which looked at the part shown by B from the underwater horizontal direction is shown by FIG.7 (b).

  7 (a) and 7 (b), a plurality of algae holding members (laver nets) 6 are supported by anchor ropes 3b and 3c fixed to the buoyancy body 2, the rope 4, and the sea floor 15, thereby allowing the sea surface 8 to be supported. It is located in the vicinity. In order to prevent the invasion of fish that damage the seaweed growing on these algae holding members 6, a food damage prevention net 9 is suspended from the rope 4 toward the seabed 15, but has not reached the seabed 15. In the vicinity of the seabed 15, the farm tool 200 is in an open state.

JP2016-77206A

  In the algae culture system 200 as shown in FIGS. 7 (a) and 7 (b), the alga-eating fish 18 is wary of the presence of the damage prevention net 9 at a time when the algae culture system 200 is just installed. Thus, it does not enter the area inside the anti-corrosion net 9. Therefore, the laver growing on the algae holding member 6 is not damaged. However, when a certain period of time elapses from the installation time of the algae farming system 200, the alga-eating fish 18 enters the inside of the feeding damage prevention net 9 from the open area near the seabed 15 and settles on the algae holding member (laver net) 6. Learn to be able to prey on seaweed. Due to such a phenomenon, there is a problem that it is not possible to effectively prevent the algae that are the target of aquaculture.

  In addition, in recent years, in the coastal areas of Japan, among the algae-eating fish that can prey on algae as described above, the number of black sea bream, medina, aigo and other inhabitants has increased rapidly, as shown in FIG. The algae farming system has a problem that it cannot sufficiently prevent the damage caused by these algal-eating fish.

  In addition, the algae-eating fish as described above not only damages algae during aquaculture, but also algae that inhabits algae in the coastal areas of Japan, and in recent years has caused enormous damage called scallop burning. . As a means for recovering the damage from such algae ground, Patent Literature 1 discloses a nutrient supply system for algae. Patent Document 1 discloses a configuration in which a water-permeable net is disposed under the algae holding member and the nutrient supply body in order to prevent algae from being damaged by algal-eating fish as one embodiment of the system. (Fig. 1, etc. in the same document). However, although it has been described until the arrangement of a water-permeable net in order to prevent algae from being damaged by algal-eating fish, the nutrient supply system disclosed in Patent Document 1 is based on the algae ground as a natural environment. It is characterized by the use of a granular material containing a reaction product of calcium silicate material and phosphorus as a means of recovering from damage caused by algae-eating fish that has rapidly increased in the number of algae in recent years. There is no disclosure or suggestion of a specific configuration or means for effectively preventing feeding damage of cultured algae and improving the production of cultured algae.

  In order to solve the above problems, according to a first aspect of the present invention, the following algae culture system is provided.

[1] (a) at least one algae holding member;
(B) a support member that supports the algae holding member so that the at least one algae holding member is disposed on or near the water surface in the farm,
(C) a feeding damage prevention net for preventing feeding damage of algae by algae fish in the farm,
With
The feeding damage prevention net is arranged so as to cover the at least one algae holding member from below in the farm,
The feeding damage prevention net and the algae holding member are arranged apart so that the algae growing on the algae holding member is not damaged by the algae-eating fish,
The anti-corrosion net is composed of a mesh having a mesh length of 5.5 cm to 19 cm.
Algae aquaculture system.

[2] The algal farming system according to [1], wherein the feeding damage prevention net has a property of sinking when the feeding damage prevention net is floated on the water surface in the farm.
[3] The algal farming system according to [1] or [2], wherein the food damage prevention net is composed of a net having a net length of 7 cm to 16 cm.
[4] The algal farming system according to any one of [1] to [3], wherein the feeding damage prevention net is made of a material having a specific gravity greater than that of water constituting the farm.

[5] The algal farming system according to any one of [1] to [4], wherein the food damage prevention net is made of a polymer fiber having a specific gravity of 1.1 or more.
[6] In any one of [1] to [5], the anti-corrosion net is composed of at least one fiber selected from the group consisting of nylon fiber, vinylon fiber, polyester fiber, and fluorocarbon fiber. The algae farming system described.

[7] The algae culture according to any one of [1] to [6], wherein the feeding damage prevention net has a property of sinking when floated on a water surface in a farm by providing a weight or a sorghum cord. system.
[8] The algae culture system according to any one of [1] to [7], further including at least one reinforcing net suspended from the support member in a substantially bottom direction.

[9] The support member forms a plurality of culture sections in the horizontal direction on the water, and each of the plurality of culture sections has a substantially quadrilateral shape.
The at least one algae holding member is installed in at least one of the aquaculture compartments;
The at least one reinforcing net includes two or more reinforcing nets;
The two or more reinforcing nets are suspended from the support member in a substantially water bottom direction so as to face a substantially water flow direction in water, and are arranged in a substantially water flow direction with respect to at least one algae holding member located in the aquaculture compartment. The algae culture system according to any one of [1] to [8], which is arranged to be located upstream.

[10] A method for producing algae, comprising culturing algae using the algae cultivation system according to any one of [1] to [9].
[11] The production method according to [10], wherein the algae is a laver.

[12] A method for cultivating algae, comprising culturing algae using the algae culture system according to any one of [1] to [9].
[13] The cultivation method according to [12], wherein the algae is a laver.

[14] A kit for use in the construction of an algal farming system according to any one of [1] to [9], comprising the following elements:
(I) a net that functions as a food damage prevention net; and (ii) an instruction describing a method for constructing the algae culture system and / or a method for producing or cultivating algae using the algae culture system.

  In addition, the embodiment thru | or modification which can further be taken in each said aspect of this invention are illustrated below.

  According to the present invention, it is possible to sufficiently prevent the algae from being damaged by algal-eating fish without inhibiting the growth of the algae to be cultured. In addition, according to the present invention, by adopting a food damage prevention net having a specific mesh length, fish including small fish such as sardines and relatively large algal food fish can be caught in the food damage prevention net. Since there are few or no fish even if they are caught, the algae culture system according to the present invention is easy to handle without the need to remove the fish from the food damage prevention net. Furthermore, according to the present invention, as described below, a configuration in which the lower part of the algae holding member is simply covered with a predetermined food damage prevention net is adopted, so that the algae culture system can be easily constructed, maintained, and decomposed. In this respect, the algae culture system according to the present invention is excellent in handleability. In addition, in the algae culture system according to some embodiments of the present invention, since the damage prevention net has a property of sinking, the water environment of the farm is caused by bad weather, water flow, rapid changes in tides, etc. Even when the water is disturbed (for example, deterioration due to strong winds, heavy rain, fast tides, etc.), the food damage prevention net does not leave the algae culture system. Therefore, the algal culture system according to the present invention is strong and excellent in durability.

It is the schematic diagram which looked at the algae culture system concerning Embodiment 1 of the present invention from the upper surface. Fig.2 (a) is a schematic diagram which shows the part of A in FIG. 1 from a side surface. FIG.2 (b) is a schematic diagram which shows the part of B in FIG. 1 from a side surface. It is a schematic diagram explaining the modification which concerns on Embodiment 1 of this invention. It is the schematic diagram which looked at the algae culture system concerning Embodiment 2 of the present invention from the upper surface. Fig.5 (a) is a schematic diagram which shows the part of A in FIG. 4 from a side surface. FIG.5 (b) is a schematic diagram which shows the part of B in FIG. 4 from a side surface. It is a figure for demonstrating the mesh length in this invention. It is a schematic diagram which shows the conventional algae culture system.

<Explanation of terms>
In the present invention, the “aquaculture farm” is a place where the algae culture system according to the present invention is installed and algae are cultured using the algae culture system. Needless to say, the farm in the present invention has a water environment in which algae can grow. Examples of the farm in the present invention include those utilizing the water environment (rivers, lakes, swamps, seas, etc.) existing in nature. When algae is cultivated using the algae cultivation system according to the present invention in an aquatic environment inhabited by fish that damage algae, it is possible to reduce or prevent the damage caused by the fish.

  In the present invention, the “water surface or the vicinity thereof” means a position relative to the water surface in the water environment of the farm, specifically, when the algal farming system according to the present invention is disposed in the farm. The position where an algae holding member is arrange | positioned in the said water environment is pointed out. A more specific position at which the algae holding member is disposed may be determined as appropriate based on the water surface in consideration of a position suitable for the algae to be cultured, a position where the work becomes easy, and the like, and is particularly limited. Not a thing. For example, since it is an algae, the algae holding member needs to be present in the water for a certain period of time, but the algae holding member above the water surface due to a change in the water level due to a change in the tide level, etc. May be located. Speaking of nori culture, it is preferable that the nori culture net, which is an algae-holding member, be able to spend time immersed in the sea and exposed to the sea due to tides. . While immersed in the sea, it absorbs enough nutrients, and while exposed to the sea, it can shed sunlight on the seaweed to promote photosynthesis, producing a high quality nori with a dark blue color. . It is also said that it has the effect of preventing the attachment of competing organisms such as diatoms. Aiming at such an effect, the algae holding member is arranged at a position on the water surface or in the vicinity thereof so that the time of being immersed in the sea and the time of being exposed to the sea can be obtained due to tides. The algae holding member can be fixed to the support. In the present invention, “water surface or its vicinity” includes, for example, a range of ± 1.5 m, ± 1 m, ± 50 cm, ± 30 cm, ± 20 cm, and the like from the water surface level.

  In the present invention, “algae” refers to “algae” to be cultured, and the type is not particularly limited. The algae in the present invention may be freshwater algae or marine algae. In general, it is marine algae that cause more significant damage to fish, so the algae in the present invention are preferably marine algae. Examples of marine algae include seaweed, seaweed (black seaweed, green seaweed, etc.), kelp, hijiki, seaweed, mozuku, and plover.

  In the present invention, “algae-fishing fish” means fish that can prey on algae, and is not particularly limited. When the algae to be cultured are marine algae, examples of fish that damage the algae include black sea bream, sea urchin, medina, aigo, sea bream, nizadai, horse mackerel, sea bream, and the like. In particular, in the cultivation of laver, the damage to these fish has been remarkable in recent years. In the present invention, the term “algae-fishing fish” generally refers to algae-eating fish that prey on algae (for example, isuzumi, medina, aigo, budai, nizadai, horse mackerel, kawahagi), isomes, coral fishes, It is a concept that includes both fish that prey on animals such as crustaceans, shellfish, and small fish, and fish that can prey on algae (for example, omnivorous fish such as black sea bream).

  In the present invention, the term “algae aquaculture system” means not only an algae farming device or algae farming apparatus constructed or manufactured by assembling necessary components or elements in the farm, but also their components before being installed in the farm. It is a concept including an algae farming tool or an algae farming device constructed or manufactured by assembling members or elements.

  In the present invention, the term “kit for use in construction of an algae culture system” means a combination of components, members, materials and the like necessary for the construction of the algae culture system. Two or more of the components included in the combination may be connected so that the algae culture system can be configured in the kit, but it is not necessary to be connected, and the algae culture system is constructed. What is necessary is just to connect when doing.

<Algae aquaculture system>
Hereinafter, Embodiment 1 and 2 are shown with reference to drawings regarding the algal culture system of this invention. The embodiment described below is merely an example for suitably explaining the present invention, and does not limit the present invention.

Embodiment 1
FIG. 1 is a top view schematically showing an algal farming system 10 according to the first embodiment. Further, FIG. 2A is a diagram in which the portion A in FIG. 1 is viewed from the lateral direction, and FIG. 2B is a diagram in which the portion B in FIG. 1 is viewed from the lateral direction. In addition, FIG.1 and FIG.2 (a) and (b) has shown the algae culture system of the state arrange | positioned in the farm. The algae culture system 10 according to the present embodiment is an algae culture system called a so-called floating type. The configuration will be described below.

  In this embodiment, as shown in FIG. 1 and FIGS. 2 (a) and (b), the algae holding member 6 is arranged so that a later-described algae holding member 6 is disposed on the water surface 8 or in the vicinity thereof in the farm. A supporting member for supporting is provided. That is, this support member is composed of three ropes 4a, seven ropes 4b, a predetermined number of buoyancy bodies 2, and anchor ropes 3a, 3b, 3c. That is, a total of twelve aquaculture sections 12 are formed by crossing and connecting three ropes 4a arranged substantially parallel to the horizontal direction and seven ropes 4b arranged substantially parallel to the vertical direction. Yes.

  In each of the aquaculture sections 12, algae holding members 6a, 6b, 6c, 6d, 6e, and 6f are arranged in parallel in the vertical direction. The material and shape of the algae holding members 6a, 6b, 6c, 6d, 6e, and 6f are not particularly limited as long as the algae to be cultured are held and can grow. For example, in the case of nori cultivation, nori cultivation nets (so-called nori nets) are commercially available, and these can be used as appropriate.

  Since the buoyant body 2 is provided as a constituent element on the outer side of each culture section 12 in the support member, the algae holding members 6a, 6b, 6c, 6d, 6e, and 6f are cultured in each culture section 12. It is provided so that it may be located in the water surface 8 or its vicinity in a field. Although it does not specifically limit as the buoyancy body 2, For example, since the buoy for fisheries is marketed, those commercially available buoys can be used.

  On the outside of each aquaculture section 12, an anchor rope 3a is further provided as a component of the support member on the extended line of the rope 4a arranged in the horizontal direction, and on the extended line of the rope 3b arranged in the vertical direction. Is provided with an anchor rope 3b. The ropes 4a and 4b and the anchor ropes 3a and 3b on each extension line may be constituted by the same rope or string, or may be constituted by connecting different ones. The anchor ropes 3a and 3b extend obliquely in water (see reference numeral 3b in FIG. 2B), and their tips are fixed to the water bottom 15 (not shown).

  Further, at the position where each rope 4a and each rope 4b are intersected, and where the buoyant body 2 is disposed, the anchor rope 3c disposed toward the bottom 15 from the intersection extends vertically. The tip of the anchor rope 3 c is fixed to the water bottom 15.

  The manner of fixing the anchor ropes 3a, 3b, 3c to the bottom 15 is not particularly limited. For example, the anchor ropes may be fixed by connecting an iron pipe or the like to the tip of these anchor ropes and driving the iron pipe into the bottom 15. it can.

  Furthermore, as shown in FIGS. 2 (a) and 2 (b), each aquaculture section 12 has a food damage prevention system that prevents food damage caused by algae growing on the algae holding members 6a, 6b, 6c, 6d, 6e, and 6f. One net 7 is arranged so as to cover the algae holding members 6a, 6b, 6c, 6d, 6e, and 6f from below. In the present invention, by providing such a food damage prevention net, the food damage of the cultured algae by the algae fish that inhabit the farm is prevented.

  It is essential that the anti-corrosion net in the present invention is composed of a mesh having a mesh length of 5.5 to 19 cm. Furthermore, it is preferable that the food damage prevention net in the present invention has a property of sinking when it is floated alone on the water surface in the farm.

  If the food damage prevention net in the present invention has a property of sinking when floated on the water surface in the farm, the food damage prevention net is algae holding member even when the water environment is disturbed due to bad weather etc. The non-contact state can be maintained, and the algae growing on the algae holding member is not damaged. Furthermore, the food damage prevention net is arranged at a constant distance from the algae holding member. This maximizes the water permeability inherent to the net, does not inhibit water currents and tides that are beneficial for algae growth in the farm, and does not inhibit algae growth.

  As the anti-corrosion net having the above-mentioned properties in the present invention, the net material having a specific gravity that is too small and floats on the water surface only by using the net is obtained by connecting a weight or a sash cord to the net. Or you may utilize the net | network comprised with the raw material which has a specific gravity larger than the specific gravity of the structural water which comprises a farm. Considering the trouble of connecting the weight or the sash cord to the net, it can be said that it is convenient to use the latter net, but it is not particularly limited to the latter. The specific net material is not particularly limited, and examples thereof include natural fibers such as hemp and synthetic fibers described later.

  When using a net made of a material having a specific gravity greater than the specific gravity of the constituent water constituting the farm, when the farm is specifically the sea, the specific gravity of the seawater is about 1.020 to 1.024. From this, it is possible to appropriately select a net that can function as an anti-corrosion net in the present invention by paying attention to the net material based on this. As for specific materials, for example, at least selected from the group consisting of nylon fibers (for example, nylon 6, 66, 12 and the like, preferably high specific gravity nylon such as nylon 66), vinylon fibers, polyester fibers, and fluorocarbon. A net composed of one fiber is mentioned. As for the specific gravity, the net that can suitably function as the anti-corrosion net in the present invention is a net composed of high specific gravity fibers, and is preferably a net composed of polymer fibers having a specific gravity greater than 1.024. Furthermore, the specific gravity is more preferably greater than 1.026, and even more preferably 1.1 or more, 1.2 or more, 1.3 or more, for example 1.4 or more, 1.5 or more. Although the upper limit of specific gravity is not specifically limited, 2.60 or less and 2.50 or less, and examples of the range include 1.10 to 2.60 and 1.10 to 2.50.

  Examples of the high specific gravity polymer fibers as described above include vinylon fibers, polyester fibers, and fluorocarbon fibers. Further, even if the specific gravity of the fiber polymer itself is relatively small (for example, low specific gravity nylon), a network composed of high specific gravity composite fibers composed of glass fiber, graphite, silica, etc. can be preferably used. From the viewpoint of high specific gravity and low cost, a network composed of polyester fibers is preferable. More specifically, as the food damage prevention net in the present invention, a variety of commercially available net materials, fishing nets and the like satisfying a specific gravity can be selected as appropriate.

  As described above, the food damage prevention net is composed of a mesh having a mesh length of 5.5 to 19 cm. In the present invention, the mesh length is a length in a state where the fibers constituting the mesh 7a are linear when the mesh 7a is stretched in the lateral direction as shown in FIG. 6 (in the direction of the arrow in FIG. 6). (Length d in FIG. 6). In addition, for example, in the fishing nets that are commercially available, the mesh is formed in the same mesh length in the approximately rhombus shape, but is not limited to such approximately rhombus shape, as long as the condition of the predetermined mesh length is satisfied, The shape may be a substantially circular shape or a substantially elliptical shape, or may be a combination of meshes having different shapes or sizes. In the case of a mesh having a substantially circular shape, a substantially elliptical shape, or the like, the length of one mesh in a state of being stretched and straightened as shown in FIG. 6 is defined as the mesh length.

  As described above, the feeding damage prevention net according to the present invention is composed of a mesh having a mesh length of 5.5 to 19 cm, so that the feeding damage of the algae by the algal eating fish can be effectively prevented, and at the same time the algal eating fish And other small fish can be reduced or prevented from being caught on the net. If fish are caught on the net and this is not removed, the carcasses will rot and hinder the growth of cultured algae. Furthermore, the work of removing fish caught on the net from the net requires a great deal of labor and time, making it impossible to perform efficient aquaculture. In other words, according to the algae culture system according to the present invention, it is possible to produce algae at a high production amount by effectively preventing algae damage by algal-eating fish without requiring unnecessary labor for maintenance and the like. It becomes.

  In the present invention, the mesh length is preferably about 7 to 16 cm, more preferably about 8 to 16 cm, and still more preferably 9 to 15.5 cm. Although not particularly limited, it is possible to use a fishery net having a rhombus mesh in such a mesh length range, and the mesh length of a net having such a rhombus mesh is: Generally, for example, about 6 cm (2 dimensions), about 10 cm (3 dimensions 3 parts), about 12 cm (4 dimensions), 15 cm (about 5 dimensions), 18 cm (about 6 cm), etc. are mentioned. When a net composed of a net having such a mesh length is used as a food damage prevention net in the present invention, it is possible to effectively prevent algae from being damaged by algae, and at the same time, the algae and other small fish Can be more effectively reduced or prevented from being caught on the net.

(Modification of Embodiment 1)
Next, the modification which can be employ | adopted in Embodiment 1 which concerns on the algae culture system called a floating type is shown.

  FIG. 3 is a view of the portion A in FIG. 1 as viewed from the side as in FIG. In this modified example, in the algae farm with one row having the above two aquaculture sections 12 arranged in the horizontal direction, as shown in FIG. 3, holding members (anchors) constituting the vertical boundary of each aquaculture section are shown. The rope 3a, 3b, 3c) employs a configuration in which the reinforcing net 17 is suspended toward the seabed.

  Here, although the material of the reinforcement net | network 17 is not specifically limited, The thing similar to the damage prevention net | network 7 can be used, for example, the thing made from resin, such as nylon and polyester, is mentioned. Further, the mesh length can be set in the same manner as the food damage prevention net 7.

  Furthermore, the reinforcement net | network 17 can be set as the structure suspended from the holding member (anchor rope 3a, 3b, 3c) toward the seabed direction by connecting a sash cord to the seabed side of the reinforcement net | network 17. FIG.

  In addition, the reinforcing net 17 has the significance of reinforcing the anti-corrosion effect of the anti-corrosion net 7, but the direction in which the mesh surface of the reinforcing net 17 is substantially opposite to the water flow (tidal current) T as shown in FIG. It is preferable to arrange so that. According to the algae farming system having such a configuration, as shown in the following examples, the presence of the reinforcing net 17 reduces the momentum of the water flow even when a water flow such as a fast tidal current is generated, thereby preventing food damage. Since the force that the net 7 receives in the vicinity of the boundary of the aquaculture area 12 is weakened, the damage prevention net 7 does not approach the laver net, and can more effectively prevent the damage caused by the algal fish, and the production amount of the laver Can be improved.

[Embodiment 2]
Next, the configuration of the algae culture system 100 according to Embodiment 2 will be described.
FIG. 4 is a top view schematically showing the algae farming system 100 according to the second embodiment. Further, FIG. 5A is a view of the portion C in FIG. 4 seen from the lateral direction, and FIG. 5B is a view of the portion D in FIG. 5 seen from the lateral direction. 4 and 5 (a) and 5 (b) show the algal farming system in a state of being disposed in the farm. The algae culture system 100 according to the present embodiment is an algae culture system called a so-called prop type. The configuration will be described below.

  In the second embodiment, as shown in FIGS. 4 and 5, eight columns 11 are driven into the water bottom 15 at substantially equal intervals in the lateral direction to form one column, and five columns are provided in parallel. Algae holding members 6 are arranged in the horizontal direction between the columns 11 in adjacent rows, and a total of four algae holding members 6 are juxtaposed. As shown in FIGS. 5 (a) and 5 (b), the strut 11 is exposed on the water, and the algae holding member 6 is fixed to the struts 11 on both sides by the binding ropes 13, so that It arrange | positions so that it may be located in the water surface 8 or its vicinity. In the second embodiment, the algae holding member 6 is specifically an algae cultivation net (for example, a laver cultivation net) as in the first embodiment. In the aquaculture farm, a support 11 and a binding rope 13 are provided as support members for supporting the algae holding member 6 so that the algae holding member 6 is disposed at or near the water surface 8.

  Further, as shown in FIGS. 5A and 5B, the algae holding member 6 in each row is provided with a food damage prevention net 7 so as to cover the algae holding member 6 from below. The damage prevention net 7 is specifically the same net as that of the first embodiment. Similarly to the algae holding member 6, the net that becomes the feeding damage prevention net 7 can be arranged at a predetermined position by being fixed to the support with a rope or a rope.

As the other conditions such as the configuration, the constituent members, and the shapes and properties of the constituent members in the second embodiment, those described in the first embodiment can be adopted unless there is a particular contradiction.
Also in Embodiment 2, the advantage and effect described about Embodiment 1 are produced by providing the food damage prevention net 7 with the above-described configuration.

  In the algae culture system according to the present invention, the feeding damage prevention net and the algae holding member that covers the net from below are arranged so far as the algae growing on the algae holding member are not damaged by the algae fish. As long as the distance between the algae holding member and the food damage prevention net is not particularly limited. As a guide, it is at least about 30 cm or more, preferably at least about 50 cm or more in the depth direction. Furthermore, by using a net such as a planar shape as a damage prevention net, when the damage prevention net that covers the algae holding member from below is bent in water, the damage prevention net is bent at the deepest part where it is most bent downward. The distance between the damage prevention net and the algae holding member is, for example, about 1.2 m or more, preferably about 1.3 m or more, more preferably about 1.4 m or more, still more preferably 1.5 or more, and most preferably about 2 m. You may adjust so that it may become above. In this case, the upper limit of the distance between the food damage prevention net and the algae holding member in the deepest part is not particularly limited, but if it is in an excessively bent state, the influence of tidal currents, Under the influence of the wind, depending on the case, each member and the aquaculture system may be damaged, and the algae growing on the algae holding member may be damaged. Therefore, it is generally 5 m or less, preferably 4 m or less, more preferably Can adopt a configuration of 3.5 m or less.

<Method of producing algae>
The method for producing algae according to the present invention (hereinafter referred to as the production method of the present invention) includes culturing algae using the algal cultivation system of the present invention. Embodiments and modifications of the algae culture system of the present invention are as described above.
Hereinafter, specific steps that can be included in the production method of the present invention will be described.

(I) To provide an algae culture system according to the present invention.
The production method of the present invention includes providing an algal farming system according to the present invention at a farm. In this process, unless it is particularly impossible, the members that are constituent elements on the ground are assembled in advance, the assembled members are transported to the farm, and other necessary members are combined, according to the present invention. An algae farming system may be provided to the farm. Alternatively, the algae culture system according to the present invention may be completed by individually transporting the components to the farm and assembling the components at the farm. In particular, the assembly procedure is not limited.

For example, with regard to the algae culture system of Embodiment 1, the anchor ropes 3a, 3b, 3c, the ropes 4a, 4b, the buoyancy body 2, and the food damage prevention net 7 are connected in advance on the ground and transported to the farm. The anchor ropes 3a, 3b, and 3c may be fixed to the bottom 15 so as to have the form shown in FIGS. Alternatively, the anchor ropes 3a, 3b, 3c, the ropes 4a, 4b, the buoyancy body 2, and the food damage prevention net 7 may be individually transported to the farm, and these members may be installed and fixed in the predetermined arrangement shown in FIG. .
Thereafter, for example, the algae holding member 6 seeded with algae (for example, a seed net obtained by sowing laver spores on algae cultivation net and raising seedlings) is fixed to the ropes 4a and 4b in the form shown in FIG. Thus, the algae culture system of the present invention can be obtained, and the target algae can be cultured. In addition, since the algae culture system according to the present invention is constructed in advance in the farm and the algae holding member 6 may be seeded with algae spores or the algae may be received, the algae culture system provided in this step In, it is not necessary that the algal bodies of the algae exist in the algae holding member 6 at the time of provision.

  For the algae culture system of the second embodiment, for example, the support 11 may be placed on the farm with the arrangement shown in FIG. 4, and then the food damage prevention net 7 may be fixed to the support. Thereafter, the algae holding member 6 seeded with algae (for example, a seed net seeded with spores of seaweed) is fixed to the rope 4 in the form shown in FIG. Can grow algae.

(Ii) To develop algae for aquaculture purposes.
Needless to say, the production method of the present invention includes growing algae such as various algae spores, filaments, and seedlings on the algae holding member. Basically, this process is to grow algae depending on the aquaculture environment in the aquaculture farm or aquarium, and the algae cultivation system of the present invention is configured for a certain period until reaching the target size and growth stage. The algae holding member may be left in the water environment while maintaining it. In this step, the algae growth status is regularly monitored, and for example, necessary measures can be taken when a disease occurs. It is not always necessary to develop the algae for cultivation using the algae cultivation system of the present invention over the entire life cycle of the target algae. As can be seen from the examples, it also includes culturing using the algal culturing system of the invention only for a part of the life cycle of the cultivating algae. This is because a predetermined effect can be obtained by using an algae culture system when growing algae for cultivation in an aquatic environment where algae-eating fish that can damage algae can exist.

(Iii) Harvesting (plucking) the grown algae.
When the algae grows to a predetermined size in the farm, the algae are harvested.
The harvesting method is not particularly limited. For example, in the case of black seaweed culture, the harvesting method using a suitable fishing boat or a pump has been established. Can do. Moreover, if it is a comparatively large-sized algae, it can also be harvested, for example, by taking out the algae holding member from the algae culture system and cutting the grown algae.

(Iv) The production method of the present invention may further include optional steps such as washing, drying, processing, packing, and / or shipping the harvested algae. In addition, the production method of the present invention produces algae spores, filaments, seedlings and the like to be cultured, and / or seeds or plants the produced algae spores, filaments, seedlings, etc. on the algae holding member. Can also include. For example, regarding black seaweed production (culture), the production method of the present invention is to cultivate the spore by attaching the fruit spore to the oyster shell, and to seed the shell spore released from the cultured filament in a laver net. Arbitrary processes, such as seedling and preparing a seed net, and raising the seed net in a farm or the like, may be included.

<Algal cultivation method>
The algae cultivation method according to the present invention (hereinafter referred to as the cultivation method according to the present invention) specifically includes the steps (i) and (ii) described above for the production method of the present invention, and harvests the grown algae. That is not an essential process.
The cultivation method according to the present invention can be used for, for example, development / improvement of a specific algae culture method, investigation and evaluation of water quality environment in a specific water area, academic research purpose, and the like.

  In addition, the order of each process in the method in the production method and cultivation method of the present invention may be executed simultaneously or sequentially unless there is no contradiction and it is not technically impossible. Also good.

<Kit>
The kit according to the present invention includes the following elements and is a kit for constructing an algal farming system according to the present invention.
(I) a net that functions as a food damage prevention net; and (ii) an instruction describing a method for constructing an algae culture system and / or a method for producing or cultivating algae using the algae culture system.

  The net that functions as a food damage prevention net is as described in the algae culture system according to the present invention.

  Instructions describing a method for constructing an algae culture system and / or a method for culturing algae using the algae culture system described above are components and components (corrosion prevention nets) that can be used for construction of an algae culture system according to the present invention. And a description and drawings concerning the construction procedure of the algal culture system according to the present invention and / or the method of producing algae or the method of cultivating algae according to the present invention. The instructions may be provided as a paper medium, may be provided as electronic data stored in a storage medium, may be provided as downloadable via a communication line such as the Internet, or displayed on a display. It may be provided.

  The kit according to the present invention is convenient for the construction of the algae culture system according to the present invention, in addition to the above components (i) and (ii), other components in the algal culture system according to the present invention (described above). Optionally includes components and materials. For example, when the purpose is to provide an algae culture system particularly used for aquaculture, the kit may include a laver net as an algae holding member and a rope and a buoyancy body as the support member.

  From November 2016 to the middle of March 2017, the present inventor of black laver using the laminar culture system shown in the following comparative examples and examples in a laver farm off the Shizushima fishing port in Futtsu City, Chiba Prefecture Aquaculture was carried out. As for Example 1, an algae culture system was constructed in the end of December 2016, and black nori was cultivated in January 2016 using the aquaculture system. Further, Examples 2 to 4 were carried out in order from January 2017. In addition, in Examples 5 to 14, a predetermined nori culture system was constructed from November 2017 to April 2018, and black nori was cultivated.

(Common conditions)
In each Example and each Comparative Example, aquaculture was carried out in accordance with the standards for aquaculture of black seaweed established by the Chiba Prefecture Fishery Cooperative Association, except for the conditions shown below. In other words, the items not specifically mentioned were carried out based on the general nori culture method, and the nori harvested in the examples and comparative examples were processed into plate nori and shipped.

  Briefly explaining the method for cultivating nori seaweed, first, around 2 to March, the oyster husks were soaked with fruit spores and the filamentous bodies were cultured. Around mid-September, a seed net was prepared by carrying out a step of seeding shell spore released from the cultured filaments on a laver net, that is, seedling. The prepared seed net was preserve | saved with the -30 degreeC freezer until the seedling raising process. Thereafter, the seed nets were bred from the beginning to the middle of October in the aquaculture farm where the water temperature was reduced to an appropriate temperature. The seed nets that were raised were subjected to aquaculture using the algae culture system according to each Example and each Comparative Example.

  The materials, dimensions (width 1.2 m × length 18 m), mesh shape (diamond) and mesh length of the laver net (corresponding to the algae holding member in the present invention) used in each comparative example and each example are the same. Seed nets (spore seeded and seeded) prepared under the same conditions using a laver net were planted in each algae culture system.

  More specifically, in the laver farm off the Shizushima fishing port in Futtsu City, Chiba Prefecture, one algae farming system (laver farming system) has two rows of aquaculture zones in the vertical direction during the laver farming season. These were arranged in 12 rows in the horizontal direction. In this farm, seven such algae farming systems were provided. Referring to FIG. 1, the algae culture system of FIG. 1 includes two culture sections 12 in one vertical row, and the six culture sections 12 in the horizontal direction are arranged in six rows. However, in the algae culture system according to each of the example and the comparative example, 12 rows are arranged in the lateral direction instead of 6 rows. One culture section had a vertical width of 25 m and a horizontal width of 12 m. Specifically, these aquaculture sections are composed of ropes having a buoyant body called a baby rope.

The seven algae culture systems have been used jointly by the fishermen's association to which the inventor belongs, and the inventor has a total of 23 aquaculture sections for one column in the vertical direction. The aquaculture test according to the following examples and comparative examples was carried out.
That is, each of these 23 rows of compartments was cultivated with laver using the configuration of the algae culture system according to each example and each comparative example as described in detail below. In addition, six nori nets (seed nets) can be planted in one section, that is, 12 nets / row × 23 rows = 276 seed nets are always planted.

  After the seed nets were planted for the first time, when the black seaweed grew to about 20-30 cm, about 7 cm was left to cut, and when it extended to about 20-30 cm with an interval of 5-7 days, the second cutting was performed. About the same nori net, this cutting operation was performed 5 to 7 times in total to harvest black nori. Black nori was harvested from about 48-60 laver nets per day. The reason why the number of nori nets to be harvested per day is different is that the growth of the nori is always different at each harvest. Due to the number of days varying from day to day.

  In Examples and Comparative Examples, a laver net 1 obtained by dividing the number of plate laver finally obtained from raw laver harvested on each harvest day by the number of laver nets harvested from the laver. The plate nori production amount per sheet was calculated, and the food damage prevention effect and the like were evaluated by comparing the production amounts of Examples and Comparative Examples. Needless to say, in each of the examples and comparative examples, the plate seaweed was processed with the same dimensions (general dimensions on the market) under the same conditions.

<Comparison of the present invention and the prior art>
Hereinafter, the configuration of the algae culture system used in each of Examples 1 to 4 and Comparative Examples 1 and 2 will be described in detail.
[Example 1]
The algae culture system according to the present example was constructed by simulating the configuration of the algae culture system 10 according to Embodiment 1 shown in FIG. 1 and FIGS. 2 (a) and 2 (b), and black seaweed was cultured. . A different point from Embodiment 1 is the number of rows of the aquaculture section in the horizontal direction (hereinafter the same applies to Examples 2 to 4 and Comparative Examples 1 and 2). In the present embodiment, a commercially available nylon fishing net (mesh length: 3.3 inches; approximately 10 cm) was used as the food damage prevention net 7. In addition, the specific gravity of the nylon fiber that is the material of the fishing net was 1.14. In addition, when the damage prevention net | network 7 is installed in each culture section, the damage prevention net | network 7 is a structure which the vicinity of the center of the damage prevention net | network 7 bends underwater as FIG. 2 (a) and (b) shows. It is added that the one with the dimension is selected. This is the same in Examples 2-4.

[Example 2]
As in Example 1, an algae culture system according to this example is constructed by simulating the configuration of the algae culture system 10 according to the first embodiment shown in FIG. 1 and FIGS. 2 (a) and 2 (b). Nori was cultivated. In Example 1, however, a nylon fishing net (mesh length: 3.3 inches; approximately 10 cm) was used as the food damage prevention net 7, whereas in this embodiment, a polyester net (mesh length: 3.3 inches; approximately 10 cm). Was used as a food damage prevention net 7. In addition, the specific gravity of the polyester fiber which is the raw material of the same net was 1.38.

[Example 3]
As in Example 1, an algae culture system according to this example is constructed by simulating the configuration of the algae culture system 10 according to the first embodiment shown in FIG. 1 and FIGS. 2 (a) and 2 (b). Nori was cultivated. However, in the present example, a nylon fishing net (mesh length: 3.3 inches; approximately 10 cm) in which a sago cord was arranged and connected along the longitudinal direction at the center in the lateral direction was used as the damage prevention net 7.

[Example 4]
As in Example 1, an algae culture system according to this example is constructed by simulating the configuration of the algae culture system 10 according to the first embodiment shown in FIG. 1 and FIGS. 2 (a) and 2 (b). Nori was cultivated. However, in this embodiment, two sago cords are arranged and connected along the longitudinal direction at a position 1.5 m inside from both sides in the short direction of a nylon fishing net (mesh length: 3.3 inches; approximately 10 cm). The thing was used as the damage prevention net 7.

[Comparative Example 1]
Black nori was cultivated using the algae culturing system having the same structure as in Example 1 except that no member corresponding to the feeding damage prevention net 7 was provided.

[Comparative Example 2]
An algae culture system according to this comparative example was constructed by simulating the configuration of the algae culture system 200 shown schematically in FIGS. 7A and 7B, and black seaweed was cultured. That is, in the algae culture system, although the damage prevention net 9 extending in the vertical direction toward the seabed 15 is provided, the damage prevention net 9 does not reach the seabed 15. As the damage prevention net 9, a commercially available nylon fishing net (mesh length: 3.3 inches; about 10 cm) was used, and the specific gravity of the nylon fiber as the material was 1.14. In addition, a weight 11 is connected to the lower part of the food damage prevention net 9.

<Examples 1 to 4 / Results of Comparative Examples 1 and 2>
Table 1 below shows the presence or absence of a food damage prevention net in the algae culture systems according to Examples 1 to 4 and Comparative Examples 1 and 2, and various conditions relating to the food damage prevention net, and plate nori production per nori net. Show.

  First, about the comparative example 1 in which the member corresponding to no food damage prevention net | network was provided, when the same kind net | network was confirmed visually after 5-7 days after planting the seed net | network (nori net), it grew almost. Some laver was not confirmed, and some laver was shorter or disappeared than at the time of planting. That is, in practice, none of the seed nets was in a state where nori could be harvested. Therefore, as shown in Table 1, the production amount of Comparative Example 1 was 0.

  Next, in Comparative Example 2 simulating the conventional algae culture system shown in FIG. 7, since a means for preventing the damage of cultured algae by algal-eating fish is provided, laver can be harvested and one laver net Although the production amount of 200 to 300 per sheet could be secured, the production amount was considerably low as compared with the normal harvesting amount without the damage caused by the alga-eating fish. In addition, when the algae culture system of Comparative Example 2 was constructed and nori culture was started, the production amount was relatively high, but after the start of cultivation, the production amount tends to decrease as the number of days increases. It was. Initially, algal-eating fish did not invade the algae farming system, being wary of the presence of a damage-preventing net, but as time passed, algal-eating fish moved from the bottom of the algal farming system directly under the laver net It was speculated that the damage caused by algal-eating fish occurred at a later time because it was learned that it was possible to enter the sea.

  On the other hand, in Example 1 which employ | adopted the structure of this invention, although the fishing net made from a nylon with comparatively small specific gravity was used as a food damage prevention net, the production amount recovered | restored with 400-500 pieces markedly. As for the algae culture system according to Example 1, although a strong wind blows and the sea condition deteriorates, the damage prevention net has floated, and some of the algae culture systems have been broken. The amount was sufficient practically.

  Furthermore, about Examples 2-4 which employ | adopted the damage prevention net | network which carried out the property which settles in water more than the damage damage prevention net | network in the algae culture system of Example 1, compared with a comparative example, the laver net 1 An extremely high production amount of 500 to 600 sheets per sheet could be secured. In addition, for Examples 2 to 4, even when strong winds were blown and the sea conditions deteriorated, the food damage prevention net did not float, and the problem that the algae culture system was destroyed did not occur. .

  In particular, for Example 2, by adopting a relatively high specific gravity polyester net for the food damage prevention net, without a Shenji cord as used in Examples 3 and 4, with a simple configuration, An extremely high production amount of 500 to 600 per laver net could be secured.

  As described above, according to the algae culture system and the algae culture method (production method and cultivation method) using the algae culture system according to the present invention, it is possible to prevent algae damage caused by algae-eating fish at a high level, and to achieve extremely high production. It was proved that it could be secured.

<Degree of deflection of the food damage prevention net in the sea>
Next, an example in which the degree of deflection in the sea is changed by changing the dimensions of the damage prevention net 7 will be described.
[Example 5]
In this example, the dimensions of the commercially available nylon fishing net (3.3 mesh length; approximately 10 cm) used as the food damage prevention net 7 in Example 1 and the vertical width (vertical direction in FIG. 1) in terms of mesh. An algae culture system was similarly constructed and black seaweed was cultivated, except that the 250th and the width (horizontal direction in FIG. 1) were changed to 150 in terms of mesh.
In this embodiment, the size of the damage prevention net 7 is changed as described above, so that the distance in the depth direction between the damage prevention net 7 and the laver net is 1. It was about 5 m.

[Example 6]
In this example, the dimensions of a commercially available nylon fishing net (3.3 mesh length; about 10 cm) used as the net for preventing damage in Example 4 were used, and the vertical width (vertical direction in FIG. 1) was converted into a mesh. An algae culture system was similarly constructed and black seaweed was cultivated except that the width of 330 (horizontal direction in FIG. 1) was changed to 180 in terms of mesh.
In the present embodiment, since the size of the damage prevention net 7 is changed as described above, the distance in the depth direction between the damage prevention net 7 and the laver net is about 3 m near the center of the aquaculture area where the both are farthest away. Even in the vicinity of the laver net that is relatively close to each other, it was about 30 cm.

[Example 7]
In this example, an algae culture system was constructed in the same manner as in Example 6 except that the damage prevention net 7 was changed to a polyester net (mesh length: 3.3 inches; approximately 10 cm). went. In this embodiment, the dimensions of the damage prevention net 7 are the same as in the sixth embodiment. The vertical width (vertical direction in FIG. 1) is 330 in terms of mesh, and the horizontal width (horizontal in FIG. 1) is 180 in terms of mesh. It is.
As in Example 6, the distance in the depth direction between the damage prevention net 7 and the laver net is about 3 m near the center of the aquaculture area where they are farthest from each other, and around the laver net where the both are relatively close Even in the vicinity of the part, it was about 30 cm.

[Example 8]
In this example, the dimensions of the commercially available nylon fishing net (3.3 mesh length; approximately 10 cm) used as the food damage prevention net 7 in Example 1 and the vertical width (vertical direction in FIG. 1) in terms of mesh. An algae culture system was constructed in the same manner except that the width of 400 and the width (horizontal direction in FIG. 1) was changed to 300 in terms of mesh, and black seaweed was cultured.
In the present example, the size of the damage prevention net 7 was changed as described above, so that the damage prevention net was sunk to the extent that the damage prevention net was not visible from the sea in the vicinity of the center of the aquaculture area where both were farthest away.

[Comparative Example 3]
In this example, the dimensions of the commercially available nylon fishing net (3.3 mesh length; approximately 10 cm) used as the food damage prevention net 7 in Example 1 and the vertical width (vertical direction in FIG. 1) in terms of mesh. An algae culture system was constructed and black seaweed was cultivated in the same manner as in Example 1 except that the width of 200 (horizontal direction in FIG. 1) was changed to 90 in terms of mesh.
In this embodiment, since the dimensions of the food damage prevention net 7 are changed as described above, the food damage prevention net 7 is hardly bent in the sea, and the food damage prevention net 7 and the laver net are almost in contact with each other. Even if there is a part where the damage prevention net 7 and the laver net are separated, the interval was about 3 to 5 cm.

(Results of Examples 5 to 8 / Comparative Example 3)
In Example 5, as described above, the distance in the depth direction between the damage prevention net 7 and the laver net was about 1.5 m in the vicinity of the center of the aquaculture area where the two were farthest away.
When strong winds or large waves are generated due to bad weather, the damage prevention net 7 and the laver net are in contact with each other, and the grown laver is damaged, cut and shortened. The effect which can prevent the damage of food was recognized.

  Further, in Examples 6 and 7, in which the damage prevention net 7 and the laver net are about 3 m near the center of the aquaculture area where the two are the most apart, and about 30 cm near the laver net where the both are relatively close Was able to effectively prevent the damage of seaweed by algal-eating fish, obtained a very good yield of seaweed, and avoided the adverse effects of bad weather as seen in Example 5.

  Furthermore, in Example 8 where the damage prevention net was sunk in the vicinity of the center of the aquaculture area so that it was not visible from the sea, the damage prevention net was attached to an anchor rope or the like when strong winds, large waves, or fast tides occurred due to bad weather. Although it was sometimes tangled and damaged, the effect itself of preventing damage to the seaweed by algal-eating fish was fully recognized.

  On the other hand, in Comparative Example 3 in which the damage prevention net and the laver net are almost in contact with each other, the growth of nori was initially observed after the seed nets were installed in the aquaculture area, but after about 3 days, they were damaged and grew. The seaweed was also shortened.

<Modified Example According to Embodiment 1: Configuration Employing Reinforcement Net 17 in addition to Corrosion Prevention Net 7>
[Example 9]
An algae culture system was constructed and black seaweed was cultured in the same manner as in Example 4 except that the configuration of the modification shown in FIG. 3 was adopted. Hereinafter, the configuration of the present embodiment will be specifically described.
FIG. 3 is a view of the portion A in FIG. 1 as viewed from the side as in FIG. In the present embodiment, in the algae farm with one row having the above-mentioned two aquaculture sections 12 arranged in the horizontal direction, as shown in FIG. In addition to providing the prevention net 7, a configuration in which the reinforcement net 17 is suspended toward the sea bottom on the anchor rope that constitutes the vertical boundary of each aquaculture section is adopted. The reinforcing net 17 is a commercially available nylon fishing net (mesh length: 3.3 cm; approx. 10 cm). The dimensions are 21 m for the vertical width (vertical direction in FIG. 1) and the horizontal width (the width in the depth direction). ) Was 2 m. It should be noted that, by connecting the shiko cord along the seabed side edge of the reinforcement net 17, the reinforcement net 17 is suspended from the anchor rope constituting the vertical boundary of each aquaculture section toward the seabed. Further, the algae culture system was configured so that the mesh surface of the reinforcing net 17 was in a direction substantially facing the tidal current T as shown in FIG.

[Example 10]
An algae culture system was constructed and black seaweed was cultured in the same manner as in Example 2 except that the configuration of the modification shown in FIG. 3 was adopted.
That is, in Example 5, a commercially available nylon fishing net (mesh length: 3.3 inches; about 10 cm; specific gravity: 1.14) was used as the food damage prevention net 7, whereas in this example, polyester was used as the food damage prevention net 7. A net (3.3 mesh length; about 10 cm; specific gravity 1.38) was used as the food damage prevention net 7. The reinforcing net 17 uses the same commercially available nylon fishing net as in Example 9 (mesh length: 3.3 dimensions; about 10 cm), and the dimensions and connection method to the aquaculture system are the same as in Example 9. .

(Results of Examples 9 and 10)
In Examples 9 and 10, as compared with Examples 1 to 8 in which the reinforcing net 17 was not employed, it was further confirmed that the damage caused by algal fish could be effectively prevented.
More specifically, in the configurations of Examples 1 to 8 in which the reinforcing net 17 is not used, in the environment where the tidal current is fast, when the damage prevention net 7 receives a greater force of the fast tidal current, the upstream boundary of the tidal current of the aquaculture area 12 Since the food damage prevention net 7 is pushed by the tide near the laver net, the algalivorous fish learns that the seaweed can be preyed near the boundary where the food damage prevention net 7 approaches the seaweed net, There was a case of being damaged.
On the other hand, in Examples 9 and 10 employing the reinforcement net 17 in addition to the corrosion prevention net 7, the presence of the reinforcement net 17 reduces the power of the tidal current even when a fast tidal current occurs. Since the force that the feeding damage prevention net 7 receives in the vicinity of the border of the aquaculture area 12 is weakened, the feeding damage prevention net 7 does not approach the laver net so much and can prevent the feeding damage caused by algae fish more effectively. It was shown that the production volume of
In addition, between Example 9 and Example 10, there was no difference of the remarkable food damage prevention effect, and the remarkable food damage prevention effect was recognized in both.

<Example of changing the mesh length of the anti-corrosion net>
[Example 11]
In this example, except that a commercially available nylon fishing net (mesh length 2 inch; approximately 6 cm) was used as the food damage prevention net 7, an algae culture system was constructed and black nori culture was conducted in the same manner as in Example 1. Went.

[Example 12]
In this example, an algae culture system was constructed in the same manner as in Example 4 except that a commercially available nylon fishing net (mesh length: 4 inches; about 12 cm) was used as the food damage prevention net 7. Went. That is, the nylon fishing net used as the damage prevention net 7 has two cords arranged and connected along the longitudinal direction at a position 1.5 m inside from both sides in the short direction.

[Example 13]
In this embodiment, a commercially available nylon fishing net (5 mesh length: about 15 cm) was used as the damage prevention net 7, and two sago cords were connected on the diagonal of the damage prevention net 7. As in Example 1, an algae culture system was constructed and black seaweed was cultured.

[Example 14]
In this example, an algae culture system was constructed in the same manner as in Example 4 except that a commercially available nylon fishing net (mesh length 6 inches; approximately 18 cm) was used as the food damage prevention net 7. went. That is, the nylon fishing net used as the damage prevention net 7 has two cords arranged and connected along the longitudinal direction at a position 1.5 m inside from both sides in the short direction.

In Examples 11 to 14, as a noteworthy point, the mesh length of the nylon fishing net used as the feeding damage prevention net 7 was changed.
In any of Examples 11 to 14, a certain level or more of damage prevention effect was recognized, and an improvement in the production amount of laver was recognized.
There was no problem in any of Examples 11 to 14 in terms of the anti-corrosion effect, but in Example 14 in which the mesh length of the anti-corrosion net 7 was about 18 cm, other examples employing smaller mesh lengths were used. In comparison, a tendency to be slightly inferior to the effect of preventing food damage was observed. Furthermore, in Example 11 in which the mesh length of the food damage prevention net 7 is about 6 cm, there is no problem with respect to the food damage prevention effect, but when the diatoms attached to the food damage prevention net 7 grow over a predetermined period, the mesh size is small. From this, it was observed that the mesh of the net for preventing damage 7 was blocked with diatoms, and in some cases, some of the seaweed to be cultured died or rotted.
Example 12 in which the mesh length of the damage prevention net 7 is about 12 cm, Example 13 in which the mesh length of the damage prevention net 7 is about 15 cm, Examples 1 to 4 adopting a mesh length of about 10 cm, etc. The effect of preventing damage to the seaweed by the fish was high, and there was no dying or rot of the seaweed as in Example 11, and high quality seaweed could be produced with good yield.
Furthermore, in Example 13 in which two sago cords are connected on the diagonal line of the damage prevention net 7, particularly the deflection of the damage prevention net 7 is not easily affected by tidal currents and bad weather, and a good yield of laver can be obtained. A trend was observed.

  Although specific embodiments and examples of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments and examples. Various modifications, modifications, and arbitrary combinations may be employed for each configuration, element, and feature without departing from the scope of the present invention.

2 Buoyancy body 3a, 3b, 3c Anchor rope 4, 4a, 4b Noose 6, 6a, 6b, 6c, 6d, 6e, 6f Algae holding member 7 Corrosion prevention net 7a Net 8 Water surface (sea surface)
9 Conventional food damage prevention net 10, 100 Algae aquaculture system 11 Prop 12 Aquaculture section 13 Tie rope 15 Water bottom (sea floor)
17 Reinforcement net 18 Algae fish 200 Conventional algae farming system T Arrow indicating the direction of water flow (tide)

Claims (14)

(A) at least one algae holding member;
(B) a support member that supports the algae holding member so that the at least one algae holding member is disposed on or near the water surface in the farm,
(C) a feeding damage prevention net for preventing feeding damage of algae by algae fish in the farm,
With
The feeding damage prevention net is arranged so as to cover the at least one algae holding member from below in the farm,
The feeding damage prevention net and the algae holding member are arranged apart so that the algae growing on the algae holding member is not damaged by the algae-eating fish,
The anti-corrosion net is composed of a mesh having a mesh length of 5.5 cm to 19 cm.
Algae aquaculture system. The algae culture system according to claim 1, wherein the food damage prevention net has a property of sinking when the food damage prevention net is floated on the water surface in the farm. The algae culture system according to claim 1 or 2, wherein the food damage prevention net is composed of a mesh having a mesh length of 7 cm to 16 cm. The algae culture system according to any one of claims 1 to 3, wherein the feeding damage prevention net is made of a material having a specific gravity larger than that of water constituting the farm. The algae culture system according to any one of claims 1 to 4, wherein the food damage prevention net is made of polymer fibers having a specific gravity of 1.1 or more. The algae culture system according to any one of claims 1 to 5, wherein the food damage prevention net is composed of at least one fiber selected from the group consisting of nylon fiber, vinylon fiber, polyester fiber, and fluorocarbon fiber. . The algae culture system according to any one of claims 1 to 6, wherein the feeding damage prevention net has a property of sinking when floated on a water surface in a farm by providing a weight or a cocoon cord. The algae culture system according to any one of claims 1 to 7, further comprising at least one reinforcing net suspended from the support member in a substantially bottom direction. The support member forms a plurality of culture sections in the horizontal direction on the water, each of the plurality of culture sections is a substantially quadrilateral,
The at least one algae holding member is installed in at least one of the aquaculture compartments;
The at least one reinforcing net includes two or more reinforcing nets;
The two or more reinforcing nets are suspended from the support member in a substantially water bottom direction so as to face a substantially water flow direction in water, and are arranged in a substantially water flow direction with respect to at least one algae holding member located in the aquaculture compartment. The algae culture system according to any one of claims 1 to 8, wherein the algae culture system is disposed so as to be located upstream. A method for producing algae, comprising culturing algae using the algae cultivation system according to any one of claims 1 to 9. The production method according to claim 10, wherein the algae is a laver. A method for cultivating algae, comprising culturing algae using the algae cultivation system according to any one of claims 1 to 9. The cultivation method according to claim 12, wherein the algae is a laver. A kit for use in the construction of an algae culture system according to any one of claims 1 to 9, comprising the following elements:
(I) a net that functions as a food damage prevention net; and (ii) an instruction describing a method for constructing the algae culture system and / or a method for producing or cultivating algae using the algae culture system.

Images