| Project/Area Number |
20780138
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
General fisheries
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| Research Institution | Hiroshima University |
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Principal Investigator |
IKEDA Hideki Hiroshima University, 大学院・生物圏科学研究科, 研究員 (50452628)
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| Project Period (FY) |
2008 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2008: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | エチゼンクラゲ / 大量発生 / 再生産 / 生殖巣 / ポリプ / ポドシスト / 無性生殖 / 休眠 / 出芽 / 刺胞動物 / 卵黄形成 / 精子形成 / 放卵 / 放精 / 光 |
|---|
| Research Abstract |
The giant jellyfish Nemopilema nomurai reproduces through sexual and asexual processes. In the sexual reproduction, medusae began to develop gonads in their gastric cavity from late June. Oocytes or sperm follicles appeared in the gonads from late July, and the number of oocyte increased and attained several hundred million per a female in November. Maturation of oocytes and sperm follicles rapidly progresses after medusae are physically damaged and are supported by the specialized gonadal epithelial cells which transfer nutrients from the gastric cavity to oocyte and sperm follicle. Asexual reproduction is carried out via dormant podocyst formed by a polyp. Podocyst stores carbohydrates, proteins, and lipids to maintain its dormancy for several years.
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