Enhancement of Asari clam growth by synergistic effects combining remediation and fertilization of sediments and analyses of material circulation in the tidal flat
| Project/Area Number |
18H02265
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 40030:Aquatic bioproduction science-related
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| Research Institution | Hiroshima University |
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Principal Investigator |
Yamamoto Tamiji 広島大学, 統合生命科学研究科(生), 名誉教授 (40240105)
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| Co-Investigator(Kenkyū-buntansha) |
齋藤 光代 岡山大学, 環境生命科学研究科, 准教授 (20512718)
小野寺 真一 広島大学, 先進理工系科学研究科(総), 教授 (50304366)
陸田 秀実 広島大学, 先進理工系科学研究科(工), 教授 (80273126)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2020: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2019: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2018: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
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| Keywords | アサリ / 干潟 / 物質循環 / 肥料 / 貧栄養 / 数値モデル / 地下水 / 硫化水素 / 底質改善 / 施肥 |
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| Outline of Final Research Achievements |
Production of Asari clam has been decreasing sharply. The major causes are generation of H2S and reduction of N and P from the land. Then, we applied the fertilizer which have abilities to reduce H2S and simultaneously solute N and P which enhance the growth of microalgae that are the feed of Asari clam. In addition to observation at tidal flat, we developed a sophisticated ecosystem model consisting of ground water penetration and permeation, and reduction-oxidation reactions in the sediments, and evaluated the material circulation in the tidal flat. The observed survival rate of Asari was obviously high (100%) compared to that of the site without fertilizer (78%). The growth was enhanced 20%. A sensitivity analysis revealed that the optimum fertilizer required for sufficient growth of Asari clam was 0.5/m^2.
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| Academic Significance and Societal Importance of the Research Achievements |
水産物自給率が60%を切るようになり、遠洋漁業が困難となる中、沿岸域での増養殖の比重を高めざるを得ない。アサリは国民的海産物であったが、近年、ほとんど獲れない生物となった。現在は、中国、韓国などからの輸入によって需要が満たされる状況であるが、食の安全などから、国内アサリの生産への期待が大きい。このようなことから、今回の研究成果は社会実装につながるものであり、安全・安心な国内産アサリの生産に向け、企業が注目するところである。
アサリ資源量の減少の原因を克服するための新たな施肥材の開発と、数値モデル計算によって成果の評価を行った点で学術的に大きな進歩である。
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Report
(4 results)
Research Products
(24 results)
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[Journal Article] A Reciprocal Acoustic Transmission Experiment for Precise Observations of Tidal Currents in a Shallow Sea2021
Author(s)
Taniguchi, N., T, Takahashi, K. Yoshiki, H, Yamamoto, A. Dinan Hanifa, Y. Sakuno, H. Mutsuda, S. W. Huang, C. F. Huang, J. H. Guo
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Journal Title
Ocean Engineering
Volume: 219
Pages: 108292-108292
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Evaluation for submarine groundwater discharge in a temperate coastal zone covered by seagrass meadows2018
Author(s)
Saito, M., Onodera, S., Zhu, A., Jin, G., Shimizu, Y., Tomozawa, Y., Okubo, K
Organizer
ECSA57
Related Report
Int'l Joint Research
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[Presentation] The effect of intensive agriculture on nitrous oxide emission from a coastal aquifer2018
Author(s)
Onodera, S., Saito, M., Onishi, K., Aritomi, D., Tomozawa, Y., Jin, G.
Organizer
45th IAH congress, Daejeon, Korea
Related Report
Int'l Joint Research
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[Book] 流域ガバナンス2021
Author(s)
伴修平・小野寺真一・齋藤光代
Total Pages
454
Publisher
京都大学学術出版
Related Report
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