2022 Fiscal Year Final Research Report
Regulation of swimming behavior of marine rotifers and evaluation of its food value for fish larvae
| Project/Area Number |
20H03063
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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 | Nagasaki University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
金 禧珍 長崎大学, 水産・環境科学総合研究科(水産), 准教授 (10823437)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 海産ワムシ類 / 遊泳行動 / 行動制御 / 遺伝子発現解析 |
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| Outline of Final Research Achievements |
With increasing concentrations of iron and zinc, both temperate and tropical rotifers swam faster. The same was observed for increasing concentrations of non-dissociated ammonia. Exposure to hypoxic conditions inhibited the growth of temperate rotifers, but did not affect tropical rotifers. The growth of tropical rotifers was also enhanced. ATP production by the glycolytic system was enhanced under hypoxia, and ROS levels increased in temperate rotifers.
Arginine phosphate, which activates ciliary movement in protozoa as an energy donor, also stimulated swimming in rotifers. When ATP produced by the phosphorylation of ADP by arginine phosphate and a motor protein (dynein) were added to water, the swimming speed of rotifers increased under exposure to non-dissociated ammonia.
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| Free Research Field |
水産増殖学
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| Academic Significance and Societal Importance of the Research Achievements |
栄養状態の良いワムシを飢餓や悪環境に曝露すると、当該環境からの逃避行動とみなせる活発な遊泳を示すことを現象面とその分子機構から明らかにした。その結果、海産仔魚の主要な天然餌料であるカイアシ類に準じるような遊泳行動をワムシが示すようになった。
遊泳速度の速い餌生物に対し仔魚は失敗を重ねても摂餌を活発に継続し、良好な成長と活力を示すことが知られている。本研究の成果により、魚類種苗生産時の生物餌料として汎用されるワムシの遊泳行動を制御することが可能となり、生産される稚魚の質的改善に役立つことが期待される。
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