JP6793286B2 - Growth promotion material for herbivorous bivalve molluscs and growth promotion method - Google Patents
Growth promotion material for herbivorous bivalve molluscs and growth promotion method Download PDFInfo
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Description
本発明は、植食性二枚貝の生育促進施肥材及び生育促進方法に関する。 The present invention relates to a fertilizer application material for promoting the growth of herbivorous bivalve molluscs and a method for promoting the growth.
干潟等の砂泥域に生息し微細藻類（植物プランクトンや付着微細藻）を餌とする植食性二枚貝、例えば、アサリやハマグリなどは重要な水産生物である。しかし、近年その漁獲量は減少し、例えばアサリの国内の自給率は４０％程度まで低下している。その主要な原因は、以下のように考えられている。 Phytophagous bivalves that live in sandy mud areas such as tidal flats and feed on microalgae (phytoplankton and attached microalgae), such as clams and clams, are important aquatic products. However, the catch has decreased in recent years, and for example, the domestic self-sufficiency rate of clams has dropped to about 40%. The main causes are considered as follows.
干潟は砂が堆積することで形成されるが、有機物粒子も同様に堆積するため、それらが砂粒子間隙を埋めることで泥中の水の交換が悪くなり、酸素が十分量供給されなくなる。この状態において、有機物の分解は酸素を必要としない嫌気分解が主流となり、硫酸還元により硫化水素が発生する。硫化水素は生物にとって猛毒であり、これにより二枚貝の生息数が減少していることが挙げられる。 Tidal flats are formed by the accumulation of sand, but organic particles also accumulate, so that they fill the gaps between the sand particles, resulting in poor water exchange in the mud and insufficient supply of oxygen. In this state, anaerobic decomposition that does not require oxygen becomes the mainstream for decomposition of organic matter, and hydrogen sulfide is generated by sulfuric acid reduction. Hydrogen sulfide is extremely toxic to living organisms, which has reduced the population of bivalves.
また、近年の窒素及びリンに対する総量規制により、とくに瀬戸内海などでは貧栄養化が進み、アサリの餌となる微細藻類（植物プランクトンおよび付着微細藻）が少ないことが挙げられる。 In addition, due to recent restrictions on total amounts of nitrogen and phosphorus, oligotrophic progress is progressing, especially in the Seto Inland Sea, and there are few microalgae (phytoplankton and adherent microalgae) that feed on asari.
更にこれに加え、ナルトビエイ等の魚類やツメタガイ、アカニシ等の肉食性巻貝などの捕食生物による食害により、アサリが大きくなる前に食べられてしまうことが挙げられる。 Furthermore, in addition to this, it can be mentioned that the clams are eaten before they grow due to predatory organisms such as fish such as Narutobiei and carnivorous snails such as Neverita didyma and Akanishi.
硫化水素抑制の対策として、従来から耕耘、曝気、浚渫、覆砂など土木的手法が実施されてきたが、汚濁物質の拡散、浚渫後の汚泥の処理、コスト高の問題がある。また、貧栄養化対策としては、近年、ノリの成長促進を考慮して、ダムからの放水、下水処理水の緩和運転などが試みられているが、アサリ等の干潟域の植食性二枚貝の増殖促進のための対策は皆無である。 Civil engineering methods such as tillage, aeration, dredging, and sand covering have been conventionally implemented as measures to suppress hydrogen sulfide, but there are problems of diffusion of pollutants, treatment of sludge after dredging, and high cost. In recent years, as measures against oligotrophic conditions, water discharge from dams and mitigation operation of treated sewage have been attempted in consideration of promoting the growth of seaweed, but the growth of herbivorous bivalves in tidal flat areas such as clams There are no measures to promote it.
また、硫化水素、及び、貧栄養化対策として、水中にて溶解する鉄、窒素、リンを供給する施肥材がある（例えば、特許文献１、特許文献２）。 Further, as a measure against hydrogen sulfide and oligotrophation, there are fertilizers that supply iron, nitrogen, and phosphorus that dissolve in water (for example, Patent Document 1 and Patent Document 2).
また、食害生物対策としては、干潟に網を張ったり、竹などの杭を狭い間隔で打ったりするなどして、ナルトビエイなどを寄せ付けないようにする試みがなされている。 In addition, as a countermeasure against feeding damage, attempts have been made to keep Narutobiei and the like away by putting nets on tidal flats and staking bamboo and other piles at narrow intervals.
特許文献１、２の施肥材では、鉄、窒素、リンを溶出させる配合比が明確ではなく、植食性二枚貝の餌となる植物性プランクトンを効果的に増殖させ得るものとは言えず、その結果、植食性二枚貝の生育を促進させられないという課題がある。
In the fertilizer materials of
網や杭などの設置では、ナルトビエイ等の食害生物による植食性二枚貝の捕食を抑制できるものの、底泥を潜って移動する食害生物を抑制することができない。 Installation of nets and stakes can suppress the predation of herbivorous bivalves by feeding organisms such as narutobiei, but cannot suppress the feeding organisms that move under the bottom mud.
本発明は上記事項に鑑みてなされたものであり、その目的とするところは、植食性二枚貝の生育を促進可能な植食性二枚貝の生育促進施肥材及び生育促進方法を提供することにある。 The present invention has been made in view of the above matters, and an object of the present invention is to provide a herbivorous bivalve growth-promoting fertilizer and a growth-promoting method capable of promoting the growth of herbivorous bivalves.
本発明の第１の態様に係る植食性二枚貝の生育促進施肥材は、
石炭灰、窒素化合物、リン化合物、鉄粉、及び、クエン酸を含有し、
前記窒素化合物、前記リン化合物、前記鉄粉中における窒素元素：リン元素：鉄元素の割合が１０〜２０：１：０．００２〜０．１である、
ことを特徴とする。
The herbivorous bivalve growth-promoting fertilizer according to the first aspect of the present invention is
Contains coal ash, nitrogen compounds, phosphorus compounds, iron powder, and citric acid,
The ratio of nitrogen element: phosphorus element: iron element in the nitrogen compound, the phosphorus compound, and the iron powder is 10 to 20: 1: 0.002 to 0.1.
It is characterized by that.
前記植食性二枚貝がアサリであることが好ましい。 It is preferable that the herbivorous bivalve is a clam.
本発明の第２の態様に係る植食性二枚貝の生育促進方法は、
本発明の第１の態様に係る植食性二枚貝の生育促進施肥材を干潟域の底泥に介在させる工程と、
前記植食性二枚貝の生育促進施肥材を鋤き込んだ底泥を覆うように食害防止用網を配置する工程と、
前記植食性二枚貝の生育促進施肥材を鋤き込んだ底泥の周囲を囲うように食害防止用板を配置する工程と、を含む、
ことを特徴とする。
The method for promoting the growth of herbivorous bivalves according to the second aspect of the present invention is
A step of interposing a fertilizer for promoting the growth of herbivorous bivalves according to the first aspect of the present invention in the bottom mud of a tidal flat area, and
A step of arranging a net for preventing feeding damage so as to cover the bottom mud in which the fertilizer material for promoting the growth of the herbivorous bivalve is plowed.
Including a step of arranging a feeding damage prevention plate so as to surround the bottom mud in which the fertilizer for promoting the growth of the herbivorous bivalve is plowed.
It is characterized by that.
また、底泥の表面から１０ｃｍ以上の深さまで前記食害防止用板を打ち込んで配置することが好ましい。 Further, it is preferable to drive and arrange the feeding damage prevention plate to a depth of 10 cm or more from the surface of the bottom mud.
本発明に係る植食性二枚貝の生育促進施肥材及び生育促進方法では、アサリ等の植食性二枚貝の生育を促進することが可能である。 The fertilizer application material and the method for promoting the growth of herbivorous bivalves according to the present invention can promote the growth of herbivorous bivalves such as clams.
本実施の形態に係る植食性二枚貝の生育促進施肥材（以下、単に生育促進施肥材とも記す）は、石炭灰、窒素化合物、リン化合物、鉄粉、及び、クエン酸、マンガン等を含有する。 The growth-promoting fertilizer material for phytophagous bivalve molluscs according to the present embodiment (hereinafter, also simply referred to as growth-promoting fertilizer material) contains coal ash, nitrogen compound, phosphorus compound, iron powder, citric acid, manganese and the like.
石炭灰と鉄粉とクエン酸を含有することで、水中において鉄イオンが溶出し、これがクエン酸によりキレート鉄となり、水中の溶存鉄濃度が格段に大きくなる。 By containing coal ash, iron powder and citric acid, iron ions are eluted in water, which becomes chelated iron by citric acid, and the concentration of dissolved iron in water becomes significantly large.
この鉄（ＩＩ）イオンは硫化水素と化学的に反応し、硫化鉄を生成することから、干潟における還元的環境にて生ずる硫酸還元による硫化水素の生成が抑えられる。これにより、植食性二枚貝等に対して猛毒である硫化水素の生成が抑えられ、植食性二枚貝の生育を阻害する一つの要因を抑制することができる。 Since this iron (II) ion chemically reacts with hydrogen sulfide to produce iron sulfide, the production of hydrogen sulfide due to sulfuric acid reduction generated in the reducing environment in the tidal flat is suppressed. As a result, the production of hydrogen sulfide, which is extremely toxic to herbivorous bivalves and the like, can be suppressed, and one factor that inhibits the growth of herbivorous bivalves can be suppressed.
また、窒素化合物、リン化合物からアンモニウムイオン等の窒素源、リン酸イオン等のリン源が溶出する。 Further, a nitrogen source such as ammonium ion and a phosphorus source such as phosphate ion are eluted from the nitrogen compound and phosphorus compound.
窒素、リンは、二枚貝の餌となる微細藻類の成長に欠かせない必須栄養源である。加えて、上述のように、生育促進施肥材は微細藻類の成長に欠かせない鉄分（鉄（ＩＩ）イオン）を溶出している。このため、二枚貝の餌である微細藻類がこれらを摂取し、微細藻類の成長、増殖が促進される。 Nitrogen and phosphorus are essential nutrient sources for the growth of microalgae that feed on bivalves. In addition, as described above, the growth-promoting fertilizer elutes iron (iron (II) ions), which is essential for the growth of microalgae. Therefore, microalgae, which are the food for bivalves, ingest them, and the growth and proliferation of microalgae are promoted.
生育促進施肥材に含まれる石炭灰は、石炭火力発電所から排出される、いわゆるフライアッシュが用いられる。フライアッシュは石炭の燃焼時に大量に生成されるものであり、その再利用が望まれていることから、石炭灰造粒物の原料として有効な再利用が可能である。 As the coal ash contained in the growth promoting fertilizer, so-called fly ash, which is discharged from a coal-fired power plant, is used. Fly ash is produced in large quantities when coal is burned, and its reuse is desired. Therefore, it can be effectively reused as a raw material for coal ash granules.
窒素化合物、リン化合物については、水中においてアンモニウムイオン等、リン酸イオン等を生じさせる化合物であれば特に限定されず、例えば、硫酸アンモニウム、リン酸ナトリウム等が挙げられる。 The nitrogen compound and the phosphorus compound are not particularly limited as long as they are compounds that generate ammonium ions, phosphate ions, etc. in water, and examples thereof include ammonium sulfate, sodium phosphate, and the like.
また、鉄粉として、鉄原子を含有していれば、合金や酸化物であってもよい。したがって、屑鉄等も利用可能である。 Further, the iron powder may be an alloy or an oxide as long as it contains an iron atom. Therefore, scrap iron and the like can also be used.
そして、窒素化合物、リン化合物、鉄粉における窒素、リン、鉄の元素比が１６：１：０．００５であり、１０〜２０：１：０．００２〜０．１であることがより好ましい。これは、微細藻類の細胞構成平均元素比が１６：１：０．００５であることから、干潟の水域にて、窒素及びリンが不足している貧栄養化状況、及び、還元的環境で鉄が硫化水素の酸化に費やされている状況においても、植食性二枚貝の生育に必要な餌となる微細藻類の生育及び増殖に好適である。 The element ratio of nitrogen, phosphorus, and iron in the nitrogen compound, phosphorus compound, and iron powder is 16: 1: 0.005, and more preferably 10 to 20: 1: 0.002 to 0.1. This is because the cell composition average element ratio of microalgae is 16: 1: 0.005, so in the oligotrophic situation where nitrogen and phosphorus are deficient in the waters of tidal flats, and iron in a reducing environment. Is suitable for the growth and growth of microalgae, which are the food necessary for the growth of herbivorous double shells, even in the situation where is spent on the oxidation of hydrogen sulfide.
これにより、微細藻類の生育、増殖が促進され、そして、これを餌とする植食性二枚貝の生育が促進される。 This promotes the growth and growth of microalgae, and promotes the growth of herbivorous bivalves that feed on them.
上述した生育促進施肥材は、例えば、石炭灰、硫酸アンモニウム、リン酸ナトリウム、鉄粉、クエン酸を混合し、これに石膏、水を添加して、パン造粒法、混練造粒法などで製造することができる。混練造粒法では不均一なサイズの生育促進施肥材が得られ、小さいサイズの生育促進施肥材からは速やかに鉄イオン、アンモニウムイオン、リン酸イオンなどが溶出されるとともに、大きいサイズの生育促進施肥材からは持続的に上記イオンが溶出され、即効性、持続性に優れる。また、混練造粒法では、一つの工程にて生育促進施肥材を製造でき、製造コストの低減につながる。 The growth-promoting fertilizer material described above is produced by, for example, a pan granulation method, a kneading granulation method, or the like by mixing coal ash, ammonium sulfate, sodium phosphate, iron powder, and citric acid, and adding gypsum and water to the mixture. can do. By the kneading and granulation method, a growth-promoting fertilizer material of non-uniform size can be obtained, and iron ions, ammonium ions, phosphate ions, etc. are rapidly eluted from the growth-promoting fertilizer material of a small size, and growth promotion of a large size is promoted. The above ions are continuously eluted from the fertilizer material, and are excellent in immediate effect and sustainability. Further, in the kneading and granulation method, the growth promoting fertilizer can be produced in one step, which leads to a reduction in production cost.
続いて、上述した生育促進施肥材を用いた植食性二枚貝の生育促進方法（以下、単に生育促進方法とも記す）について説明する。 Subsequently, a method for promoting the growth of herbivorous bivalves using the above-mentioned growth-promoting fertilizer (hereinafter, also simply referred to as a method for promoting growth) will be described.
生育促進方法は、上述した生育促進施肥材を干潟域の底泥に鋤き込む工程と、生育促進施肥材を鋤き込んだ底泥を覆うように食害防止用網を配置する工程と、生育促進施肥材を鋤き込んだ底泥の周囲を囲うように食害防止用板を配置工程とを含む。 The growth promotion method includes a step of plowing the above-mentioned growth promoting fertilizer into the bottom mud in the tidal flat area, a step of arranging a feeding damage prevention net so as to cover the bottom mud with the growth promoting fertilizer, and growth. It includes a step of arranging a plate for preventing feeding damage so as to surround the bottom mud in which the accelerated fertilizer material is plowed.
アサリ等の二枚貝は、干潟等の底泥に潜って棲息していること、そして、上記のように底泥の還元的環境を改善すべく、生育促進施肥材を底泥に鋤き込む。 Bivalves such as short-necked clams live in the bottom mud of tidal flats, etc., and as described above, in order to improve the reducing environment of the bottom mud, a growth-promoting fertilizer is plowed into the bottom mud.
そして、ナルトビエイ等の食害生物が二枚貝を摂食してしまわぬよう、食害防止用網で、生育促進施肥材を鋤き込んだ箇所を覆う。食害防止用網のメッシュサイズはその周辺に棲息する食害生物が入り込まないサイズとし、例えば、５〜１０ｍｍである。 Then, to prevent feeding damage organisms such as narutobiei from eating the bivalve shells, a net for preventing feeding damage covers the place where the growth promoting fertilizer is plowed. The mesh size of the feeding damage prevention net is a size that does not allow feeding damage organisms living in the vicinity to enter, and is, for example, 5 to 10 mm.
更に、ツメタガイ、アカニシなどの肉食性巻貝は底泥を潜って移動する食害生物の侵入を防止すべく、生育促進施肥材を鋤き込んだ箇所の周囲を食害防止用板で囲む。上述したツメタガイ等は通常１０ｃｍ以上は潜らないため、底泥の表面から１０ｃｍ以上の深さまで食害防止用板を打ち込んで囲むことが好ましい。 Furthermore, carnivorous snails such as Neverita didyma and Akanishi surround the area where the growth-promoting fertilizer is plowed with a feeding damage prevention plate in order to prevent the invasion of feeding damage organisms that move under the bottom mud. Since the above-mentioned Neverita didyma usually does not dive more than 10 cm, it is preferable to drive a plate for preventing feeding damage to a depth of 10 cm or more from the surface of the bottom mud.
このように、生育促進方法では、生育促進施肥材による底泥改質、及び、栄養成分の溶出、並びに、食害防止用網、及び、食害防止用板による食害生物の侵入の防止により、二枚貝の生育が促進され、そして、食害生物による植食性二枚貝の摂食が防止されることから、効果的に二枚貝の生育を促進することができる。 In this way, in the growth promotion method, the bivalve molluscs are modified by modifying the bottom mud with the growth promotion fertilizer, elution of nutrients, and preventing the invasion of feeding organisms by the feeding damage prevention net and the feeding damage prevention plate. Since the growth is promoted and the feeding of the phytophagous bivalve by the predatory organism is prevented, the growth of the bivalve can be effectively promoted.
尾道市浦崎町の浦崎干潟において、アサリの生育促進の検証を行った。干潟に１．２ｍ×１．２ｍの区画（１．４４ｍ２）を４つ形成した。それぞれの区画について、ツメタガイ等の底泥を潜って移動する食害生物の侵入を防止すべく、食害防止用板を底泥から１０ｃｍ以上打ち込んで囲った。 We verified the promotion of clam growth in the Urasaki tidal flats in Urasaki-cho, Onomichi. Four 1.2m x 1.2m sections (1.44m 2 ) were formed on the tidal flat. In each section, in order to prevent the invasion of feeding damage organisms that move under the bottom mud such as Neverita didyma, a feeding damage prevention plate was driven in and surrounded by 10 cm or more from the bottom mud.
このうちの３つの区画について、生育促進施肥材を０．６９ｋｇ（４７９ｇ／ｍ２）、１．３８ｋｇ（９５８ｇ／ｍ２）、２．７６ｋｇ（１９１７ｇ／ｍ２）鋤き込んだ。これをそれぞれ５００ｇ区、１０００ｇ区、２０００ｇ区と記す。なお、施肥材は表１に示す成分、重量比にて、混練造粒法で製造したもの（粒径２ｍｍ〜１５ｍｍ）を用いた。
For three of these plots, 0.69 kg (479 g / m 2 ), 1.38 kg (958 g / m 2 ) and 2.76 kg (1917 g / m 2 ) of growth-promoting fertilizer were plowed. These are referred to as 500 g ward, 1000 g ward, and 2000 g ward, respectively. As the fertilizer application material, those produced by the kneading and granulating method (
また、残り１つの区画については生育促進施肥材を鋤き込まなかった。これを対象区と記す。 In addition, the growth promoting fertilizer was not plowed into the remaining one section. This is referred to as the target area.
４つのそれぞれの区画について、平成２７年５月１９日にアサリの稚貝（約５ｍｍ）を放流した。放流量はそれぞれ１，０００個／ｍ２とした。 On May 19, 2015, young clams (about 5 mm) were released for each of the four sections. The discharge rate was 1,000 pieces / m 2 respectively.
そして、それぞれの区画を食害防止用網（９ｍｍ目メッシュ）で覆った。 Then, each section was covered with a net for preventing feeding damage (9 mm mesh).
そして、平成２７年５月１９日、平成２７年７月３０日、平成２７年９月２７日、平成２７年１１月２５日に各区画の底泥を採取し、その間隙水中のアンモニウムイオン濃度、リン酸イオン濃度、鉄（ＩＩ）イオン濃度を測定した。図１、図２、図３にそれぞれアンモニウムイオン濃度、リン酸イオン濃度、鉄（ＩＩ）イオン濃度の測定結果を示す。 Then, on May 19, 2015, July 30, 2015, September 27, 2015, and November 25, 2015, the bottom mud of each section was collected, and the ammonium ion concentration in the interstitial water was collected. , Phosphate ion concentration and iron (II) ion concentration were measured. FIGS. 1, 2 and 3 show the measurement results of ammonium ion concentration, phosphate ion concentration and iron (II) ion concentration, respectively.
また、各区画の１ｍ２あたりに生息しているアサリを採取し、アサリの総重量、アサリの個数、及び、アサリの個体重量を測定した。図４、図５、図６に、アサリの総重量、アサリの個数、及び、アサリの個体重量の測定結果を示す。なお、５００ｇ区においては、食害防止用網が破損してしまったため、９月、１１月のアサリの総重量、アサリの個数、及び、アサリの個体重量の測定は行わなかった。 In addition, the clams inhabiting 1 m 2 of each section were collected, and the total weight of the clams, the number of clams, and the individual weight of the clams were measured. FIGS. 4, 5 and 6 show the measurement results of the total weight of the clams, the number of clams, and the individual weight of the clams. In the 500 g section, the total weight of the clams, the number of clams, and the individual weight of the clams were not measured in September and November because the net for preventing feeding damage was damaged.
図１、図２、図３のアンモニウムイオン濃度、リン酸イオン濃度、鉄（ＩＩ）イオン濃度について、１０００ｇ区、２０００ｇ区で高い傾向は見られるが、生育促進施肥材の量に応じた大きな関連性は見られなかった。これらのイオンは微細藻類に摂取されるものゆえ、また、鉄（ＩＩ）イオンは硫化水素の酸化に利用されるものゆえ、生育促進施肥材の量に応じた大きな関連性が表れなかったものと考えられる。 The ammonium ion concentration, phosphate ion concentration, and iron (II) ion concentration in FIGS. 1, 2, and 3 tend to be high in the 1000 g group and the 2000 g group, but are largely related to the amount of the growth-promoting fertilizer. No sex was seen. Since these ions are ingested by microalgae, and iron (II) ions are used for oxidation of hydrogen sulfide, there is no significant relationship depending on the amount of growth-promoting fertilizer. Conceivable.
図４のアサリの総重量では、対象区に比べ、生育促進施肥材を鋤き込んだ５００ｇ区、１０００ｇ区、２０００ｇ区では、いずれも大きくなっていること、また、ほぼ生育促進施肥材の量に応じて総重量が大きいことがわかる。なお、９月に比べ、１１月では総重量が減少している。これは、アサリの自然死のためと考えられる。 The total weight of the clams in FIG. 4 is larger in the 500 g group, 1000 g group, and 2000 g group in which the growth promoting fertilizer is plowed, and the amount of the growth promoting fertilizer is almost the same as that in the target group. It can be seen that the total weight is large accordingly. The total weight has decreased in November compared to September. This is thought to be due to the natural death of the clams.
また、図５のアサリ個体数にはそれぞれの区画でさほど有意差は見られないが、２０００ｇ区では重量が大きい個体の割合が多い傾向が見られる。また、図６のアサリの平均固体重量では、区画毎に異なっており、２０００ｇ区で最も重量が大きい。この結果から、生育促進施肥材の施用により、アサリの生育が促進され、アサリが大きくなったことがわかる。 In addition, although there is not much difference in the number of clams in FIG. 5 in each section, there is a tendency that the proportion of heavy clams is high in the 2000 g group. In addition, the average solid weight of the clams in FIG. 6 differs for each section, and is the heaviest in the 2000 g section. From this result, it can be seen that the application of the growth-promoting fertilizer material promoted the growth of the clams and increased the size of the clams.
植食性二枚貝の生育促進施肥材及び植食性二枚貝の生育促進方法では、アサリ等の植食性二枚貝の生育を促進できるので、植食性二枚貝の養殖に利用可能である。 Promotion of growth of herbivorous bivalves The fertilizer material and the method of promoting the growth of herbivorous bivalves can promote the growth of herbivorous bivalves such as clams, and thus can be used for the cultivation of herbivorous bivalves.
Claims (4)
前記窒素化合物、前記リン化合物、前記鉄粉中における窒素元素：リン元素：鉄元素の割合が１０〜２０：１：０．００２〜０．１である、
ことを特徴とする植食性二枚貝の生育促進施肥材。 Contains coal ash, nitrogen compounds, phosphorus compounds, iron powder, and citric acid,
The ratio of nitrogen element: phosphorus element: iron element in the nitrogen compound, the phosphorus compound, and the iron powder is 10 to 20: 1: 0.002 to 0.1.
A fertilizer that promotes the growth of herbivorous bivalve molluscs.
ことを特徴とする請求項１に記載の植食性二枚貝の生育促進施肥材。 The herbivorous bivalve is a clam,
The fertilizer-fertilizing material for promoting the growth of herbivorous bivalve molluscs according to claim 1.
前記植食性二枚貝の生育促進施肥材を鋤き込んだ底泥を覆うように食害防止用網を配置する工程と、
前記植食性二枚貝の生育促進施肥材を鋤き込んだ底泥の周囲を囲うように食害防止用板を配置する工程と、を含む、
ことを特徴とする植食性二枚貝の生育促進方法。 The step of interposing the growth promoting fertilizer for the herbivorous bivalve according to claim 1 or 2 in the bottom mud of the tidal flat area, and
A step of arranging a net for preventing feeding damage so as to cover the bottom mud in which the fertilizer for promoting the growth of the herbivorous bivalve is plowed.
Including a step of arranging a feeding damage prevention plate so as to surround the bottom mud in which the fertilizer for promoting the growth of the herbivorous bivalve is plowed.
A method for promoting the growth of herbivorous bivalve molluscs.
ことを特徴とする請求項３に記載の植食性二枚貝の生育促進方法。 The feeding damage prevention plate is driven in and arranged to a depth of 10 cm or more from the surface of the bottom mud.
The method for promoting the growth of a herbivorous bivalve according to claim 3, wherein the method is characterized by the above.
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