2023 Fiscal Year Final Research Report
Typhoons activate the process of organic degradation in a coastal aquaculture area
| Project/Area Number |
20K06193
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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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| Co-Investigator(Kenkyū-buntansha) |
谷口 亮人 近畿大学, 農学部, 講師 (10548837)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 有機物分解力 / 海洋細菌 / 環境酵素 / 細胞外酵素活性 / 雨水 / 台風 / 季節風 / 鉛直混合 |
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| Outline of Final Research Achievements |
I investigated the impact of typhoons and seasonal winds on the organic matter decomposition in aquaculture areas. The decomposition capacity of organic matter was evaluated based on the activity of environmental enzymes. The measured enzyme activities were leucine aminopeptidase, which breaks down proteins, as well as trypsin and β-glucosidase, which breaks down sugars.
The relationship between organic matter decomposition capacity and water quality parameters differed between the surface layer and the bottom layer. In the surface layer, there was a positive correlation with water temperature and a strong negative correlation with salinity. In contrast, in the bottom layer, the same activity showed a negative correlation with water temperature and a positive correlation with DO.
It was revealed that in the surface layer, heavy rains enhance the organic matter decomposition, while in the bottom layer, vertical mixing caused by strong winter winds increases the decomposition capacity.
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| Free Research Field |
水族環境学
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| Academic Significance and Societal Importance of the Research Achievements |
養殖漁場の有機物分解力を明らかにすることは持続的な養殖生産を確保する上で重要な課題である。本研究では水域の水質・底質浄化力の解明においてカギとなる高分子（タンパク質など）から低分子有機物（アミノ酸など）への有機物分解力に着目した。養殖漁場の有機物分解力は、表層では大雨により向上すること、底層では強風による鉛直混合で活性化することを本研究により明らかにした。台風などによる大雨や季節風による強風が養殖漁場の有機物分解力に影響すること解明した点は新規な知見である。この研究成果は養殖漁場の環境容量を見積もる上で有用な情報を提供し、環境調和型の魚類養殖の構築に資するという点において社会的意義も高い。
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