JP2014187911A - Artificial seaweed bed and method for forming artificial seaweed bed - Google Patents

Artificial seaweed bed and method for forming artificial seaweed bed Download PDF

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JP2014187911A
JP2014187911A JP2013065009A JP2013065009A JP2014187911A JP 2014187911 A JP2014187911 A JP 2014187911A JP 2013065009 A JP2013065009 A JP 2013065009A JP 2013065009 A JP2013065009 A JP 2013065009A JP 2014187911 A JP2014187911 A JP 2014187911A
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water
algae
reef
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Mitsuhiko Kawabata
三彦 川畑
Kazunori Endo
和教 遠藤
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Sumitomo Osaka Cement Co Ltd
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Sumitomo Osaka Cement Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
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    • Y02A40/81—Aquaculture, e.g. of fish

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Abstract

PROBLEM TO BE SOLVED: To provide an artificial seaweed bed which can grow seaweeds efficiently even in a region around an algal reef in a sea bed, and can artificially form a seaweed bed in a wide range of the sea bed, and to provide a forming method thereof.SOLUTION: An artificial seaweed bed is provided with an algal reef installed in a sea bed, and a reticulate member which covers the algal reef and a region around the algal reef in the sea bed. The reticulate member is characterized by being formed so that a mesh size in a sea bed side region located in the sea bed side may be smaller than a mesh size of a water surface side region located in a water surface side rather than the sea bed side region.

Description

本発明は、水底に設置される藻礁を用いて人工的に形成される藻場および該藻場の形成方法に関する。   The present invention relates to an algae field artificially formed using an algal reef installed on the bottom of the water and a method for forming the algae field.

藻類の胞子や藻類自体が礁材に付着してなる藻礁を水底に設置することで、人工的な藻場（人工藻場）の形成が行われている。人工藻場の形成においては、藻礁上の藻類をある程度の大きさにまで育成させる必要がある。しかしながら、藻礁上の藻類をエサとする生物（捕食生物）が水底および水底近傍の水中に多数生息している地域がある。このため、斯かる地域では、藻礁上で藻類を育成し難く、効率的に藻場を形成し難い環境となっている。   Artificial algae beds (artificial algae beds) have been formed by installing algae reefs with algae spores and algae themselves attached to reef materials on the bottom of the water. In the formation of artificial seaweed beds, it is necessary to grow algae on the alga reef to a certain size. However, there are areas where many organisms (predatory organisms) that feed on algae on the algae reef inhabit the water bottom and the water near the bottom. For this reason, in such an area, it is difficult to grow algae on the algal reef and it is difficult to form an algae field efficiently.

そこで、藻礁上の藻類を捕食生物から保護するべく、藻礁上の藻類を網状部材で覆う方法が提案されている（特許文献１参照）。斯かる方法では、網状部材の内側への捕食生物の侵入が防止されるため、藻礁上の藻類が捕食生物のエサとなるのを防止することができる。これにより、網状部材で覆われた藻礁上に藻類を育成し易い環境を形成することができる。   Then, in order to protect the algae on the algae reef from predatory organisms, a method of covering the algae on the algae reef with a mesh member has been proposed (see Patent Document 1). In such a method, invasion of predatory organisms inside the mesh member is prevented, so that algae on the alga reef can be prevented from becoming food for predatory organisms. Thereby, the environment which is easy to grow algae on the algal reef covered with the net-like member can be formed.

特開２００７−６７９６号公報JP 2007-6796 A

ここで、藻礁を水底に設置した場合、藻礁上の藻類から放散される胞子は、礁材上だけでなく、水底における藻礁周辺の領域にも付着することになる。このため、藻礁周辺の領域でも藻類を育成させることが可能である。しかしながら、上記のような方法では、藻類が育成し易い環境を藻礁上に形成することができるものの、水底における藻礁周辺の領域は、網状部材で保護されていないため、捕食生物の影響によって藻類の育成し難い環境となっている。   Here, when the algae reef is installed on the bottom of the water, the spores released from the algae on the algae reef adhere to not only the reef material but also the area around the algae on the bottom of the water. For this reason, it is possible to grow algae even in the area around the algae reef. However, in the method as described above, although an environment in which algae can easily grow can be formed on the algal reef, the area around the algae reef in the bottom of the water is not protected by the net-like member. It is an environment where it is difficult to grow algae.

そこで、本発明は、水底における藻礁周辺の領域においても藻類を効率的に育成させることができ、水底の広い範囲に人工的に藻場を形成することができる人工藻場およびその形成方法を提供することを課題とする。   Therefore, the present invention provides an artificial algae field and a method for forming the algae field that can efficiently grow algae even in the area around the alga reef on the bottom of the water and can artificially form algae fields over a wide area of the bottom of the water. The issue is to provide.

本発明に係る人工藻場は、水底に設置される藻礁と、該藻礁および水底における藻礁周辺の領域を覆う網状部材とを備え、該網状部材は、水底側に位置する水底側領域の網目寸法が該水底側領域よりも水面側に位置する水面側領域の網目寸法よりも小さくなるように形成されることを特徴とする。   An artificial seaweed bed according to the present invention includes an algae reef installed on the bottom of the water, and a net-like member that covers the alga reef and a region around the alga reef on the bottom of the sea. The mesh size is formed so as to be smaller than the mesh size of the water surface side region located on the water surface side than the water bottom side region.

斯かる構成によれば、藻礁に加えて水底における藻礁周辺の領域（以下、藻礁周辺領域とも記す）も網状部材によって覆われるため、藻礁周辺領域が網状部材によって捕食生物から隔離される。このため、藻類が育成し易い環境を藻礁周辺領域に形成することができる。これにより、藻礁上だけでなく、藻礁周辺領域においても藻類の育成を効率的に行うことができるため、より広い範囲に藻場を形成することができる。   According to such a configuration, in addition to the algae reef, the area around the algae reef in the bottom of the water (hereinafter also referred to as the algae reef area) is covered with the mesh member, so that the algae reef area is isolated from the predatory organisms by the mesh member. The For this reason, an environment in which algae can be easily grown can be formed in the area around the algal reef. Thereby, since algae can be efficiently cultivated not only on the algae reef but also in the area around the algae reef, an algae field can be formed in a wider range.

また、網状部材における水底側領域の網目寸法が水面側領域の網目寸法よりも小さくなるように形成されることで、水底に生息している捕食生物（ウニ・貝類など）が網状部材で覆われた領域の内に侵入するのが防止される。これにより、網状部材で覆われた領域（即ち、藻礁および藻礁周辺領域）内での藻類の育成を効率的に行うことができる。   In addition, by forming the mesh size in the bottom area of the mesh member to be smaller than the mesh size in the water surface area, predatory organisms (such as sea urchins and shellfish) that inhabit the bottom are covered with the mesh member. Intrusion into the area is prevented. Thereby, the algae can be efficiently cultivated in the area covered with the mesh member (that is, the area around the alga reef and the algal reef).

一方、水面側領域の網目寸法を大きくすることで、網状部材に意図しない藻類が付着して網目が閉塞されるのが抑制される。これにより、藻類の育成に必要な光が網状部材を通過して網状部材で覆われた領域（即ち、藻礁および藻礁周辺領域）内の藻類にまで届きやすくなる。このため、網状部材が閉塞することによって藻類の育成が阻害されるのを抑制することができる。   On the other hand, by enlarging the mesh size of the water surface side region, unintentional algae adhere to the mesh member and the mesh is blocked. Thereby, the light necessary for the growth of algae can easily reach the algae in the region (that is, the algal reef and the region around the algal reef) covered with the reticulated member through the reticulated member. For this reason, it can suppress that the growth of algae is obstructed when the mesh member is blocked.

また、前記藻礁は、水底に間隔を空けて複数設置されており、前記網状部材は、複数の藻礁を覆うように構成されることが好ましい。   Moreover, it is preferable that a plurality of the algae reefs are installed at intervals in the bottom of the water, and the mesh member is configured to cover the plurality of algae reefs.

また、前記網状部材は、端部の少なくとも一部に重り部材を備えることが好ましい。   The mesh member preferably includes a weight member at least at a part of the end portion.

また、前記網状部材は、端部の全域に亘って前記重り部材を備え、該重り部材は、水底に接触することで水底の形状に沿って変形自在に構成されることが好ましい。   Moreover, it is preferable that the said net-like member is provided with the said weight member over the whole region of an edge part, and this weight member is comprised so that a deformation | transformation is possible along the shape of a water bottom by contacting a water bottom.

また、前記網状部材は、水底側領域の網目寸法が１０ｍｍ以上４０ｍｍ以下であると共に、水面側領域の網目寸法が４０ｍｍ以上７０ｍｍ以下であることが好ましい。   In addition, the mesh member preferably has a mesh size of 10 mm to 40 mm in the water bottom side region and a mesh size of 40 mm to 70 mm in the water surface side region.

前記網状部材の水底側領域は、水底から５０ｃｍ以下の領域に形成されることが好ましい。   The water bottom side region of the mesh member is preferably formed in a region of 50 cm or less from the water bottom.

本発明に係る人工藻場の形成方法によれば、水底に設置される藻礁を用いて人工的に藻場を形成する人工藻場の形成方法であって、水底に配置される際に水底側に位置する水底側領域の網目寸法が該水底側領域よりも水面側に位置する水面側領域の網目寸法よりも小さくなるように形成される網状部材を用いて、水底に設置される藻礁と、水底における藻礁周辺の領域とを覆うことを特徴とする。   According to the method for forming an artificial seaweed bed according to the present invention, a method for forming an artificial seaweed bed that artificially forms a seaweed bed using an algae reef installed on the water bottom, Using a net-like member formed so that the mesh size of the water bottom side region located on the side is smaller than the mesh size of the water surface side region located on the water surface side than the water bottom side region, And an area around the algal reef on the bottom of the water.

以上のように、本発明によれば、水底における藻礁周辺の領域においても藻類を効率的に育成することができ、水底の広い範囲に人工的に藻場を形成することができる。   As described above, according to the present invention, algae can be efficiently cultivated also in the area around the alga reef on the bottom of the water, and an algae field can be artificially formed over a wide area of the bottom of the water.

本実施形態に係る人工藻場を示した斜視図。The perspective view which showed the artificial seaweed bed concerning this embodiment. （ａ）は、本実施形態に係る網状部材の端部に備えられる塊状の重り部材が水底に接触した状態を示す断面図、（ｂ）は、本実施形態に係る網状部材の端部に備えられる鎖状の重り部材が水底に接触した状態を示す断面図。(A) is sectional drawing which shows the state which the massive weight member with which the edge part of the mesh member which concerns on this embodiment was equipped contacted the water bottom, (b) is equipped with the edge part of the mesh member which concerns on this embodiment. Sectional drawing which shows the state which the chain-shaped weight member made contacted the water bottom. 他の実施形態に係る人工藻場を示した斜視図。The perspective view which showed the artificial seaweed bed which concerns on other embodiment. 更に、他の実施形態に係る人工藻場を示した斜視図。Furthermore, the perspective view which showed the artificial seaweed bed which concerns on other embodiment. 更に、他の実施形態に係る人工藻場を示した斜視図。Furthermore, the perspective view which showed the artificial seaweed bed which concerns on other embodiment. 更に、他の実施形態に係る人工藻場を示した斜視図。Furthermore, the perspective view which showed the artificial seaweed bed which concerns on other embodiment.

以下、本発明の実施形態について図１および図２を参照しながら説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

本実施形態に係る人工藻場１および人工藻礁１の形成方法では、図１に示すように、水底Ｌ（例えば、湖底、河底、又は、海底）に設置される藻礁（藻類、又は、藻類の胞子が付着した礁材からなるもの）２と、該藻礁２および水底Ｌにおける藻礁２周辺の領域（以下、藻礁周辺領域とも記す）を覆う網状部材３とが用いられる。   In the method for forming the artificial algae place 1 and the artificial algae reef 1 according to the present embodiment, as shown in FIG. 1, the algae reef (algae or algae) installed on the bottom L (for example, a lake bottom, a river bottom, or a sea bottom). And a net-like member 3 that covers a region around the algae reef 2 and the algae reef 2 in the bottom L (hereinafter also referred to as a region around the algae reef).

藻礁２としては、コンクリートや樹脂等からなる礁材に人工的に藻類やその胞子を付着させて形成される人工藻礁や、水底Ｌの岩や石などに自然に藻類やその胞子が付着して形成される天然藻礁が用いられる。藻礁２として天然藻礁を用いる場合には、水底Ｌの天然藻礁を移動させることなく、天然藻礁および天然藻礁の周辺の領域を人工藻場１の形成領域としてもよい。   Algae reef 2 is an artificial algae reef formed by artificially attaching algae and its spores to reef material made of concrete, resin, etc., and algae and their spores naturally attached to rocks and stones in the bottom L Natural algae reef formed in this way is used. When a natural alga reef is used as the algae reef 2, the natural algae reef and the area around the natural algae reef may be used as the formation area of the artificial algae reef 1 without moving the natural algae reef at the bottom L.

藻礁２は、水底Ｌに間隔をあけて（面状に）複数設置される。藻礁２間の間隔としては、特に限定されるものではなく、水底Ｌにおける人工藻場１を形成する領域の面積や、藻類の種類に応じて適宜設定することができる。具体的には、藻礁間の間隔としては、例えば、２ｍ以上２０ｍ以下であることが好ましく、５ｍ以上１５ｍ以下であることがより好ましい。   A plurality of the algal reefs 2 are installed at intervals (in the form of a plane) on the water bottom L. The interval between the algal reefs 2 is not particularly limited, and can be set as appropriate according to the area of the region of the bottom L that forms the artificial algae field 1 and the type of algae. Specifically, the distance between the algal reefs is, for example, preferably 2 m or more and 20 m or less, and more preferably 5 m or more and 15 m or less.

前記網状部材３は、複数の貫通孔を備えるシート材から構成される。本実施形態では、網状部材３は、柔軟性を有するシート材から構成される。また、網状部材３は、水底Ｌにおける人工藻場１を形成する領域（以下、藻場形成領域とも記す）を上方から覆うように形成される網材上壁部３ａと、藻場形成領域の外周全体を包囲するように形成される網材側壁部３ｂとから構成される。そして、網状部材３は、人工藻礁１が形成された状態で、網材側壁部３ｂが水底Ｌから起立した状態になると共に、網材上壁部３ａが水底Ｌから離間した状態に保持される。本実施形態では、網状部材３は、人工藻礁１が形成された状態で、立方体状となるように構成される。   The mesh member 3 is made of a sheet material having a plurality of through holes. In the present embodiment, the mesh member 3 is composed of a flexible sheet material. Further, the net-like member 3 includes a net material upper wall portion 3a formed so as to cover a region (hereinafter also referred to as a seaweed bed formation region) in the bottom L of the artificial seaweed bed 1 and a seaweed bed formation region. It is comprised from the net | network material side wall part 3b formed so that the outer periphery whole may be surrounded. And the net-like member 3 is held in a state where the net material side wall portion 3b stands up from the water bottom L and the net material upper wall portion 3a is separated from the water bottom L while the artificial alga reef 1 is formed. The In this embodiment, the net-like member 3 is configured to have a cubic shape in a state where the artificial alga reef 1 is formed.

また、網状部材３（具体的には、網材側壁部３ｂ）は、水底Ｌ側に位置する水底側領域Ｒ１の網目寸法が該水底側領域Ｒ１よりも水面側に位置する水面側領域Ｒ２の網目寸法よりも小さくなるように形成される。本実施形態では、水底側領域Ｒ１は、網材側壁部３ｂにおける水底Ｌから上方に向かって所定の距離以下の領域に形成される。具体的には、網材側壁部３ｂにおける水底Ｌからの距離が５０ｃｍ以下の領域が水底側領域Ｒ１となることが好ましく、３０ｃｍ以下の領域が水底側領域Ｒ１となってもよい。   Further, the net-like member 3 (specifically, the net material side wall 3b) has a mesh size of the water bottom side region R1 located on the water bottom L side of the water surface side region R2 located on the water surface side of the water bottom side region R1. It is formed to be smaller than the mesh size. In this embodiment, water bottom side area | region R1 is formed in the area | region below a predetermined distance toward upper direction from the water bottom L in the net | network material side wall part 3b. Specifically, it is preferable that the area | region whose distance from the water bottom L in the net | network material side wall part 3b is 50 cm or less becomes the water bottom side area | region R1, and the area | region of 30 cm or less may be the water bottom side area | region R1.

水底側領域Ｒ１の網目寸法は、特に限定されるものではないが、網材側壁部３ｂの水底側領域Ｒ１と同じ水深に生息している捕食生物の大きさに応じて適宜設定される。例えば、水底側領域Ｒ１の網目寸法としては、１０ｍｍ以上４０ｍｍ以下であってもよく、１０ｍｍ以上３０ｍｍ以下であってもよく、２０ｍｍ以上４０ｍｍ以下であってもよい。   The mesh size of the water bottom side region R1 is not particularly limited, but is appropriately set according to the size of the predator living at the same water depth as the water bottom side region R1 of the net material side wall portion 3b. For example, the mesh size of the water bottom region R1 may be 10 mm or more and 40 mm or less, 10 mm or more and 30 mm or less, or 20 mm or more and 40 mm or less.

一方、水面側領域Ｒ２は、網材側壁部３ｂにおける水底Ｌから上方に向かって所定の距離を超える領域に形成される。本実施形態では、網材側壁部３ｂにおける水底側領域Ｒ１よりも水面側の領域と、網材上壁部３ａとによって形成される。具体的には、水面側領域Ｒ２となる領域しては、網状部材３における水底Ｌからの距離が５０ｃｍを超える領域であることが好ましく、３０ｃｍを超える領域であってもよい。   On the other hand, the water surface side region R2 is formed in a region exceeding a predetermined distance upward from the water bottom L in the net material side wall 3b. In this embodiment, it is formed by the area | region of the water surface side rather than water bottom side area | region R1 in the net | network material side wall part 3b, and the net | network material upper wall part 3a. Specifically, the region to be the water surface region R2 is preferably a region in which the distance from the water bottom L in the mesh member 3 exceeds 50 cm, and may be a region exceeding 30 cm.

網状部材３は、図２に示すように、端部（具体的には、網材側壁部３ｂの下端部）に重り部材３ｃを備える。そして、網状部材３は、斯かる重り部材３ｃの重量によって水底Ｌに固定される。重り部材３ｃは、水底Ｌに接触することで水底Ｌの形状に沿って変形自在に構成される。これにより、網状部材３の端部（具体的には、網材側壁部３ｂの下端部）が水底Ｌの形状に沿った状態となるように構成される。   As shown in FIG. 2, the net-like member 3 includes a weight member 3c at an end (specifically, a lower end of the net side wall 3b). The mesh member 3 is fixed to the bottom L by the weight of the weight member 3c. The weight member 3 c is configured to be deformable along the shape of the water bottom L by contacting the water bottom L. Thereby, it is comprised so that the edge part (specifically the lower end part of the mesh material side wall part 3b) of the mesh member 3 may be in the state along the shape of the water bottom L.

重り部材３ｃの構成としては、特に限定されるものではなく、例えば、図２（ａ）に示すように、複数の塊状体３ｄから構成されるものを用いることができる。斯かる塊状体３ｄは、網材側壁部３ｂの下端部の全域に亘って間隔を空けずに取り付けることで、重り部材３ｃを構成する。また、他の構成の重り部材３ｃとしては、例えば、図２（ｂ）に示すように、鎖状に形成された金属製の鎖状体３ｅから構成されるものを用いることができる。斯かる鎖状体３ｅは、網材側壁部３ｂの下端部の全域に亘って取り付けることで、重り部材３ｃを構成する。このように、重り部材３ｃが複数の塊状体３ｄや鎖状体３ｅから構成されることで、重り部材３ｃが水底Ｌの形状に沿って変形可能となり、網材側壁部３ｂの下端部が水底Ｌの形状に沿って水底Ｌに固定される。   The configuration of the weight member 3c is not particularly limited. For example, as shown in FIG. 2 (a), a configuration including a plurality of massive bodies 3d can be used. Such a lump 3d constitutes the weight member 3c by being attached over the entire area of the lower end portion of the net material side wall 3b without any gap. Moreover, as the weight member 3c having another configuration, for example, as shown in FIG. 2B, a member composed of a metal chain body 3e formed in a chain shape can be used. Such a chain-like body 3e constitutes a weight member 3c by being attached over the entire region of the lower end portion of the net material side wall portion 3b. Thus, the weight member 3c is composed of a plurality of mass bodies 3d and chain bodies 3e, so that the weight member 3c can be deformed along the shape of the water bottom L, and the lower end portion of the net material side wall portion 3b is the bottom of the water bottom. It is fixed to the bottom L along the shape of L.

上記のような構成の人工藻場１を形成する際には、水底Ｌに複数の藻礁２を設置する。そして、該藻礁２および水底Ｌにおける藻礁周辺領域を覆うように、網状部材３を配置する。これにより、網状部材３が重り部材３ｃによって水底Ｌに固定されると共に、網状部材３（具体的には、網材上壁部３ａ）と水底Ｌとの間に藻類の育成環境が形成される。   When the artificial seaweed bed 1 having the above configuration is formed, a plurality of algal reefs 2 are installed on the bottom L. And the net-like member 3 is arrange | positioned so that the algal reef surrounding area in this algal reef 2 and the water bottom L may be covered. Thereby, the net-like member 3 is fixed to the water bottom L by the weight member 3c, and an algae growing environment is formed between the net-like member 3 (specifically, the net material upper wall 3a) and the water bottom L. .

以上のように、本発明に係る人工藻場およびその形成方法によれば、水底における藻礁周辺領域においても藻類を効率的に育成することができ、水底の広い範囲に人工的に藻場を形成することができる。   As described above, according to the artificial seaweed bed and the method for forming the same according to the present invention, algae can be efficiently grown even in the area around the alga reef at the bottom of the water, and the seaweed bed is artificially formed over a wide area of the bottom of the water. Can be formed.

即ち、前記人工藻場１およびその形成方法は、藻礁２に加えて水底Ｌにおける藻礁周辺領域も網状部材３によって覆われるため、藻礁周辺領域が網状部材３によって捕食生物から隔離される。このため、藻類が育成し易い環境を藻礁周辺領域に形成することができる。これにより、藻礁２上だけでなく、藻礁周辺領域においても藻類の育成を効率的に行うことができるため、より広い範囲に藻場を形成することができる。   That is, in the artificial algae ground 1 and its formation method, the area around the algae reef in the bottom L is covered with the mesh member 3 in addition to the algae reef 2, so that the area around the algae reef is isolated from the predatory organisms by the mesh member 3. . For this reason, an environment in which algae can be easily grown can be formed in the area around the algal reef. Thereby, since algae can be efficiently cultivated not only on the algae reef 2 but also in the area around the algae reef, an algae field can be formed in a wider range.

また、網状部材３の水底側領域Ｒ１の網目寸法が水面側領域Ｒ２の網目寸法よりも小さくなるように形成されることで、水底に生息している捕食生物（ウニ・貝類など）が網状部材３で覆われた領域の内に侵入するのが防止される。これにより、網状部材３で覆われた領域（即ち、藻礁２および藻礁周辺領域）内での藻類の育成を効率的に行うことができる。   Further, by forming the mesh size of the water bottom side region R1 of the mesh member 3 to be smaller than the mesh size of the water surface side region R2, the predatory organisms (sea urchins, shellfish, etc.) that inhabit the bottom of the water are reticulated. Intrusion into the area covered with 3 is prevented. Thereby, the algae can be efficiently grown in the region covered with the net member 3 (that is, the algal reef 2 and the algal reef surrounding region).

一方、水面側領域Ｒ２の網目寸法を大きくすることで、網状部材３に意図しない藻類が付着して網目が閉塞されるのが抑制される。これにより、藻類の育成に必要な光が網状部材３を通過して網状部材で覆われた領域（即ち、藻礁および藻礁周辺領域）内の藻類にまで届きやすくなる。このため、網状部材が閉塞することによって藻類の育成が阻害されるのを抑制することができる。   On the other hand, by enlarging the mesh size of the water surface region R2, it is possible to prevent unintended algae from adhering to the mesh member 3 and blocking the mesh. Thereby, the light required for the growth of algae can easily reach the algae in the region (that is, the algal reef and the region around the algal reef) that passes through the reticulated member 3 and is covered with the reticulated member. For this reason, it can suppress that the growth of algae is obstructed when the mesh member is blocked.

なお、本発明に係る人工藻場およびその形成方法は、上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変更が可能である。また、上記した複数の実施形態の構成や方法等を任意に採用して組み合わせてもよく（１つの実施形態に係る構成や方法等を他の実施形態に係る構成や方法等に適用してもよく）、さらに、下記する各種の変更例に係る構成や方法等を任意に選択して、上記した実施形態に係る構成や方法等に採用してもよいことは勿論である。   In addition, the artificial seaweed bed and its formation method according to the present invention are not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. Further, the configurations and methods of the plurality of embodiments described above may be arbitrarily adopted and combined (even if the configurations and methods according to one embodiment are applied to the configurations and methods according to other embodiments). Of course, it is of course possible to arbitrarily select configurations, methods, and the like according to various modifications described below and employ them in the configurations, methods, and the like according to the above-described embodiments.

例えば、上記実施形態では、水底Ｌに設置された複数の藻礁２を網状部材３で覆うようにして人工藻場１が形成されているが、これに限定せれるものではなく、単一の藻礁２とその周辺の領域を網状部材３で覆うようにしてもよい。   For example, in the above-described embodiment, the artificial seaweed basin 1 is formed so as to cover the plurality of algal reefs 2 installed on the water bottom L with the net-like member 3, but is not limited to this. You may make it cover the algal reef 2 and the area | region of the circumference | surroundings with the net-like member 3. FIG.

また、上記実施形態では、水底Ｌに複数の藻礁２が面状に設置されているが、これに限定せれるものではなく、例えば、複数の藻礁２が直線状に設置されてもよい。   Moreover, in the said embodiment, although the some algal reef 2 is installed in planar shape in the water bottom L, it is not limited to this, For example, the some algal reef 2 may be installed in linear form. .

また、上記実施形態では、網材上壁部３ａと、網材側壁部３ｂとから網状部材３が形成されているが、これに限定されるものではなく、網材上壁部３ａのみで網状部材３が形成されてもよい。斯かる場合には、網材上壁部３ａは、外周端部に重り部材３ｃを備える。そして、網材上壁部３ａの中央部が水底Ｌから離間した状態で保持されることで、網材上壁部３ａの中央部と水底Ｌとの間に藻類の育成環境が形成される。   Moreover, in the said embodiment, although the net-like member 3 is formed from the net | network material upper wall part 3a and the net | network material side wall part 3b, it is not limited to this, It is net-like only by the net | network material upper wall part 3a. The member 3 may be formed. In such a case, the net member upper wall 3a includes a weight member 3c at the outer peripheral end. And the center part of the net | network material upper wall part 3a is hold | maintained in the state spaced apart from the water bottom L, and the growth environment of algae is formed between the center part of the net | network material upper wall part 3a and the water bottom L. FIG.

また、上記実施形態のように、網材上壁部３ａを底部Ｌから離間した状態に保持する方法としては、特に限定されるものではなく、網材上壁部３ａにおける底部Ｌから離間させたい領域にフロート（浮き）を取り付ける方法を採用することができる。   In addition, as in the above embodiment, the method of holding the mesh material upper wall portion 3a in a state of being separated from the bottom portion L is not particularly limited, and it is desired to separate the mesh material upper wall portion 3a from the bottom portion L of the mesh material upper wall portion 3a. A method of attaching a float to the area can be employed.

具体的には、図３に示すように、網状部材３を構成する綱材よりも太く形成された親綱材Ｔを立方体状に形成される網状部材３の各辺に沿って取り付け、網材上壁部３ａの外周部に取り付けられた親綱材Ｔに複数のフロートＦが取り付けられることで、網材上壁部３ａの外周端部に浮力を与え、網材上壁部３ａの全体が水底Ｌから離間した状態に保持されるように構成されてもよい。   Specifically, as shown in FIG. 3, the parent rope material T formed thicker than the rope material constituting the mesh member 3 is attached along each side of the mesh member 3 formed in a cubic shape. By attaching a plurality of floats F to the parent rope material T attached to the outer peripheral portion of the upper wall portion 3a, buoyancy is imparted to the outer peripheral end portion of the net material upper wall portion 3a, and the entire net material upper wall portion 3a is You may comprise so that it may be hold | maintained in the state spaced apart from the water bottom L. FIG.

又は、図４に示すように、網材上壁部３ａの外周部に取り付けられた親綱材Ｔに複数のフロートＦが取り付けられると共に、網材上壁部３ａの外周部から中央部に亘って取り付けられる親綱材ＴにフロートＦが複数取り付けられることで、網材上壁部３ａの外周端部および中央部に浮力を与え、網材上壁部３ａの全体が水底Ｌから離間した状態に保持されるように構成されてもよい。   Or as shown in FIG. 4, while the several float F is attached to the parent rope material T attached to the outer peripheral part of the net | network material upper wall part 3a, it extends over the center part from the outer peripheral part of the net | network material upper wall part 3a. By attaching a plurality of floats F to the parent rope material T to be attached, buoyancy is given to the outer peripheral end and the center of the mesh material upper wall 3a, and the entire mesh material upper wall 3a is separated from the bottom L It may be configured to be held in the.

更に、図５に示すように、網状部材３が円筒状に形成される場合には、網材上壁部３ａの外周部に取り付けられた親綱材Ｔに、網材上壁部３ａの周方向に略等間隔でフロートＦが複数取り付けられることで、網材上壁部３ａの全体が水底Ｌから離間した位置に保持されるように構成されてもよい。   Furthermore, as shown in FIG. 5, when the mesh member 3 is formed in a cylindrical shape, the circumference of the mesh material upper wall 3a is attached to the parent rope material T attached to the outer periphery of the mesh material upper wall 3a. A plurality of floats F may be attached at substantially equal intervals in the direction, so that the entire mesh material upper wall 3a may be held at a position separated from the water bottom L.

親綱材Ｔの太さとしては、網状部材３を構成する綱材の太さの５倍以上１０倍以下であることが好ましい。このような親綱材Ｔを使用することで、網状部材３の外周部が親綱材Ｔによって補強されるため、網状部材３の損傷を抑制することができる。   The thickness of the parent rope material T is preferably 5 to 10 times the thickness of the rope material constituting the net member 3. By using such a parent rope material T, since the outer periphery of the mesh member 3 is reinforced by the parent rope material T, damage to the mesh member 3 can be suppressed.

また、上記実施形態では、網状部材３が水底に固定されているが、これに限定されるものではなく、網材側壁部３ｂの一部（水面側領域や水底側領域）が藻礁２に固定されてもよい。   Moreover, in the said embodiment, although the net-like member 3 is being fixed to the water bottom, it is not limited to this, A part (water surface side area | region and water bottom side area | region) of the net | network material side wall part 3b is in algal reef 2. It may be fixed.

また、図６に示すように、水底Ｌにおける網状部材３で覆われる複数の藻礁２のうち、少なくとも１つの藻礁２における藻類が網状部材３’によって覆われてもよい。   Further, as shown in FIG. 6, among the plurality of algal reefs 2 covered with the net-like member 3 in the water bottom L, algae in at least one algal reef 2 may be covered with the net-like member 3 ′.

１…人工藻場、２…藻礁、３…網状部材、３ａ…網材上壁部、３ｂ…網材側壁部、３ｃ…重り部材、３ｄ…塊状体、３ｅ…鎖状体、Ｌ…水底、Ｒ１…水底側領域、Ｒ２…水面側領域   DESCRIPTION OF SYMBOLS 1 ... Artificial algae field, 2 ... Algae reef, 3 ... Reticulated member, 3a ... Reticulated material upper wall part, 3b ... Reticulated material side wall part, 3c ... Weight member, 3d ... Mass, 3e ... Chain object, L ... Water bottom , R1 ... water bottom side region, R2 ... water surface side region

Claims (7)

水底に設置される藻礁と、該藻礁および水底における藻礁周辺の領域を覆う網状部材とを備え、該網状部材は、水底側に位置する水底側領域の網目寸法が該水底側領域よりも水面側に位置する水面側領域の網目寸法よりも小さくなるように形成されることを特徴とする人工藻場。   A seaweed reef installed on the bottom of the water, and a net-like member covering the alga reef and the area around the seaweed reef in the bottom of the water, and the net-like member has a mesh size of the water bottom side area located on the water bottom side than the water bottom side area. An artificial seaweed bed characterized by being formed to be smaller than the mesh size of the water surface side region located on the water surface side. 前記藻礁は、水底に間隔を空けて複数設置されており、前記網状部材は、複数の藻礁を覆うように構成されることを特徴とする請求項１に記載の人工藻場。   2. The artificial algae ground according to claim 1, wherein a plurality of the algae reefs are installed at intervals on the bottom of the water, and the mesh member is configured to cover the plurality of algae reefs. 前記網状部材は、端部の少なくとも一部に重り部材を備えることを特徴とする請求項１又は２に記載の人工藻場。   The artificial seaweed bed according to claim 1 or 2, wherein the mesh member includes a weight member at least at a part of the end portion. 前記網状部材は、端部の全域に亘って前記重り部材を備え、該重り部材は、水底に接触することで水底の形状に沿って変形自在に構成されることを特徴とする請求項３に記載の人工藻場。   The said net-like member is provided with the said weight member over the whole region of an edge part, This weight member is comprised freely deformable along the shape of a water bottom by contacting a water bottom. The artificial seaweed place described. 前記網状部材は、水底側領域の網目寸法が１０ｍｍ以上４０ｍｍ以下であると共に、水面側領域の網目寸法が４０ｍｍ以上７０ｍｍ以下であることを特徴とする請求項１乃至４の何れか一項に記載の人工藻場。   5. The mesh member according to claim 1, wherein the mesh size of the bottom region is 10 mm or more and 40 mm or less, and the mesh size of the water surface region is 40 mm or more and 70 mm or less. Artificial seaweed bed. 前記網状部材の水底側領域は、水底から３０ｃｍ以下の領域に形成されることを特徴とする請求項１乃至５の何れか一項に記載の人工藻場。   The artificial seaweed bed according to any one of claims 1 to 5, wherein a water bottom side region of the mesh member is formed in a region of 30 cm or less from the water bottom. 水底に設置される藻礁を用いて人工的に藻場を形成する人工藻場の形成方法であって、
水底に配置される際に水底側に位置する水底側領域の網目寸法が該水底側領域よりも水面側に位置する水面側領域の網目寸法よりも小さくなるように形成される網状部材を用いて、水底に設置される藻礁と、水底における藻礁周辺の領域とを覆うことを特徴とする人工藻場の形成方法。 A method for forming an artificial seaweed bed by artificially forming a seaweed bed using an algae reef installed at the bottom of the water,
Using a net-like member formed so that the mesh size of the water bottom side region located on the water bottom side when arranged on the water bottom is smaller than the mesh size of the water surface side region located on the water surface side than the water bottom side region. A method for forming an artificial seaweed bed, characterized by covering a seaweed reef installed at the bottom of the water and a region around the seaweed reef at the bottom of the water.
JP2013065009A 2013-03-26 2013-03-26 Artificial seaweed bed and method for forming artificial seaweed bed Pending JP2014187911A (en)

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Publication number Priority date Publication date Assignee Title
JP2016123384A (en) * 2015-01-07 2016-07-11 住友大阪セメント株式会社 Seaweed bed reef

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JP3105786B2 (en) * 1996-06-13 2000-11-06 松下電器産業株式会社 Mobile communication receiver
JP2008054557A (en) * 2006-08-30 2008-03-13 Sumitomo Osaka Cement Co Ltd Protective net device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3105786B2 (en) * 1996-06-13 2000-11-06 松下電器産業株式会社 Mobile communication receiver
JP2008054557A (en) * 2006-08-30 2008-03-13 Sumitomo Osaka Cement Co Ltd Protective net device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016123384A (en) * 2015-01-07 2016-07-11 住友大阪セメント株式会社 Seaweed bed reef

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