| Project/Area Number |
15580158
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | The University of Tokyo |
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Principal Investigator |
HINO Akinori The University of Tokyo, Graduate School of Agricultural and Life Sciences, Professor, 大学院・農学生命科学研究科, 教授 (90012012)
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| Co-Investigator(Kenkyū-buntansha) |
OKAMOTO Ken The University of Tokyo, Graduate School of Agricultural and Life Sciences, Associate Professor, 大学院・農学生命科学研究科, 助教授 (20160715)
AOKI Shigeru The University of Tokyo, Graduate School of Agricultural and Life Sciences, Assistant, 大学院・農学生命科学研究科, 助手 (50270898)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2003: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Marine rotifer / Chemostat-system / Waste water / Emission control / Zero-emission / 窒素フロー / 連続培養 / ケモスタット / 窒素安定同位体 / 標識クロレラ |
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| Research Abstract |
Waste waters from hatcheries are out of control in the eye of the law at present. "Zero-emission" should be imposed, however, from the view point of "Exist together Ecosystems" in the near future. In this program, we discussed advantages of "Chemostat-rotifer-production-system, the newest invention" after precision experiments on "nitrogen (N) conversion efficiency from food provision to rotifer", "material flow" and "rotifer quality" in comparison with Batch-culture-system, the typical ordinary production system.
In Batch-culture-system, increasing unionized-ammonia affected and lowered the food conversion efficiency in both L and S type rotifers, which induced an outbreak of unassimilated food in water. As a result, the concentration of organic substances was high compared by the amount of harvested rotifers.
In Chemostat system, production efficiency (rotifer N divided by assimilated food N) was examined. The maximum value in L-type rotifer was 40% that was higher than the 30% in S-type rotifer. Collectively, ammonia emission from Chemostat system was lower than that from Batch-culture-system, and it was less than quarter of Batch-culture-system.
As an index of the activity of harvested rotifers, carbon and nitrogen contents were evaluated. Those from Batch-culture-system were far less than the ones from Chemostat system, which may because of the worsening environmental conditions in Batch-culture as time elapsed.
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