| Project/Area Number |
22K05811
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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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 | Kindai University |
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Principal Investigator |
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Project Status |
Completed (Fiscal Year 2024)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2024: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | ホンモロコ / 産卵時期 / 産卵場所 / 水位調整 / 資源加入 / 選択性 / 水位低下 / 水位操作 / 初期生活史 / 産卵生態 / 耳石 / ふか日組成 / 資源変動 / 産卵 / 資源 |
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| Outline of Research at the Start |
ホンモロコを対象として①沿岸域で漁獲された稚魚のふ化日推定により，資源加入に重要な産卵時期と場所を把握，②沿岸域の産卵場所内での微細な物理環境を特定することを目指す。これによりホンモロコの沿岸域での資源加入のメカニズムが解明でき，ホンモロコの産卵に配慮した琵琶湖の水位調整方法の確立をめざす。
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| Outline of Final Research Achievements |
Honmoroko (Gnathopogon caerulescens), an endangered species endemic to Lake Biwa, is adversely affected by the desiccation of eggs caused by the water level management, and deterioration of spawning habitats (lakeshore vegetation zone). The present survey of Honmoroko eggs around emergent vegetation zones along the foreshore in two study areas indicated that Honmoroko selectively spawn at shallow sites with greater water velocity, utilizing emergent plants, such as Salix spp.. In addition, juveniles in early spawning season recruited in the stock, but those in late spawning season did not recruit in the stock. The findings confirmed the importance of protecting the spawning habitats around the Lake Biwa shoreline, and have important implications for the controlled management of Lake Biwa water levels with regard to Honmoroko spawning.
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| Academic Significance and Societal Importance of the Research Achievements |
淡水魚は湖の沿岸や河川の浅い場所で産卵するといわれているが、そのような場所は環境の悪化や水位低下などによる人為的な影響を受けやすい。本研究によりホンモロコに代表される淡水魚がそのような人為的な影響を強く受けていること確認できた。本研究の結果から、そのような沿岸の産卵環境を保全するとともに、産卵時期の水位を維持することの重要性を提示することができた。
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