2007 Fiscal Year Final Research Report Summary
Study on the mechanism of lunar-related spawning in honeycomb grouper
| Project/Area Number |
18580186
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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 | Nagasaki University |
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Principal Investigator |
SOYANO Kiyoshi Nagasaki University, Institute for East China Sea Research, Professor (80260735)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Masaru University of Ryukyus, Tropical Biosphere Research Centre, Professor (10101734)
NAGAE Masaki Nagasaki University, Faculty of Environmental Studies, Associate Professor (00315227)
GEN Koichro Nagasaki University, Researcher (80372051)
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| Project Period (FY) |
2006 – 2007
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| Keywords | maturation / lunar-related spawning / honeycomb grouper / hormone / spawning migration / biotelemetry |
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| Research Abstract |
The honeycomb grouper ainephelus merra, which is distributed in the sub-tropical and tropical area in Pacific Ocean, is known as a lunar-related spawning. However, details of gonadal development and spawning in this species are not well understood. In this study, we investigated the gonadal development, hormonal changes, and expression of gonadotropin gene in female collected from the reef area around Sesoko Island and Iriomote Island in Okinawa during spawning season. In addition, we investigated the spawning migration to suitable environment for spawning using biotelemetry method.
Ovaries of fish collected in both areas were occupied with oocytes of the tertiary yolk stage, when gonadosomatic index increased and reached the maximum level around full moon. However, mature size of fish in Ireornete Island was smaller than that in Sesoko Island. Moreover, fish of Treomote started female-to-male sex change immediately after the spawning season. On the other hand, sex change in fish collected from Sesoko Island stared in a few months after the spawning season. The different characteristics in both areas may depend on the difference in density, niche in the reefs, depth, water current, and water temperature. Estradiol levels indicated high just prior to spawning. Luteinizing hormone beta subunit gene expressed during reproductive period in female grouper, suggesting LH has important roles on gonadal development and steroid synthesis. In both areas, the fish migrated to suitable environment for spawning from habitat place just after full moon. It appears that the environment has water depth necessary to do the spawning behavior.
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Research Products
(28 results)
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[Journal Article] Induction of maturation and ovulation with HCG treatment in thesevenband grouper, Epinephelus septemfasciatus.2008
Author(s)
Song, Y. B., Baek, H. J., Kim, H. B., Soyano. K., Kim, S. J., Lee, Y. D.
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Journal Title
Journal of Aquaculture 21
Pages: 96-101
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Induction of maturation and ovulation with HCG treatment in the sevenband grouper, Epinephelus septemfasciatus.2008
Author(s)
Song, Y. B., Baek, H. J., Kim, H. B., Soyano, K., Kim, S. J., Lee, Y. D.
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Journal Title
Journal of Aquaculture 21
Pages: 96-101
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Reproduction and larviculture of seven-band grouper, Epinephelus septernfasciatus.2008
Author(s)
Soyano, K., Sakakura, Y., Hagiwara, A
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Journal Title
The Aquaculture of Groupers, (eds. Liao, I C., Leano, E. M.) National Taiwan Ocean University, Keelung, Taiwan.
Pages: 1-27
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Changes in androgen-producing cell size and circulating 11-ketotestosterone level during female-male sex change of honeycomb grouper Epinephelus merra.2006
Author(s)
Alam, M. A., Bhandari, R. K., Kobayashi, Y., Nakamura, S., Soyano, K., Nakamura, M.
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Journal Title
Molecular Reproduction and Development 73
Pages: 206-214
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Spawning of grouper.2008
Author(s)
Soyano, K., Izumida, D., Inagami, Y., Aoki, J., Takushima, M.
Organizer
3rd ECSER Symposium "Ecophysiology"
Place of Presentation
Nagasaki, Japan
Year and Date
20081200
Description
「研究成果報告書概要(欧文)」より
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[Presentation] ハタ科魚類の産卵2008
Author(s)
征矢野清, 泉田大介, 稲上裕也, 青木純哉, 宅島めぐみ
Organizer
第3回ECSERシンポジウムMarine Ecophysiology
Place of Presentation
長崎
Year and Date
20080300
Description
「研究成果報告書概要(和文)」より
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[Presentation] Characteristics of sex-maturation and spawning behavior in thepopulation of Iriomote and Sesoko Island, Okinawa, in honeycombgrouper Epinephelus merra.2007
Author(s)
Inagami, Y., Masumoto, T., Akiyama, N., Kohno, H., Nakamura, M., Soyano, K.
Organizer
4th Japan-Korea, Korea-Japan Joint Meeting on Reproductive Biology of Aquatic Animals.
Place of Presentation
長崎
Year and Date
20071100
Description
「研究成果報告書概要(和文)」より
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[Presentation] Characteristics of sex-maturation and spawning behavior in the population of Iriomote and Sesoko Island, Okinawa, in honeycomb grouper Epinephelus merra.2007
Author(s)
Inagami, Y., Masumoto, T., Akiyama, N., Kohno, H., Nakamura, M., Soyano, K.
Organizer
4th Japan-Korea, Korea-Japan Joint Meeting on Reproductive Biology of Aquatic Animals.
Place of Presentation
Nagasaki, Japan
Year and Date
20071100
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Sex-maturation and spawning behavior of honeycomb grouper Epinephelus merra, at Iriomote and Sesoko Islands, Okinawa, Japan.2006
Author(s)
Inagami, Y., Masumoto, T., Akiyama, N., Kohno, H., Nakamura, M., Soyano, K.
Organizer
Korea-Japan, Japan-Korea Joint Meeting on Reproductive Biology of Aquatic Animals.
Place of Presentation
韓国済州島
Year and Date
20061200
Description
「研究成果報告書概要(和文)」より
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[Presentation] Reproductive characteristics of honeycomb grouper in Iriomote Island and Sesoko Island, Okinawa2006
Author(s)
Inagami, Y., Masumoto, T., Akiyama, N., Kohno, H., Nakamura, M., Soyano, K.
Organizer
Tropical Biosphere Research Centre Symposium
Place of Presentation
Okinawa
Year and Date
20061200
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Sex-maturation and spawning behavior of honeycomb grouper Epinephelus merra, at Iriomote and Sesoko Islands, Okinawa, Japan.2006
Author(s)
Inagami, Y., Masumoto, T., Akiyama, N., Kohno, H., Nakamura, M., Soyano, K.
Organizer
Korea-Japan, Japan-Korea Joint Meeting on Reproductive Biology of Aquatic Animals.
Place of Presentation
Jeju, Korea
Year and Date
20061100
Description
「研究成果報告書概要(欧文)」より
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[Book] Reproduction and larviculture of seven-band grouper, Epinephelusseptemfasciatus. pp 1-27, The Aquaculture of Groupers. (eds. Liao, IC. and Leano, E. M. ).2008
Author(s)
Soyano. K., Sakakura, Y., Hagiwara, A
Total Pages
241
Publisher
National Taiwan Ocean University, Keelung, Taiwan
Description
「研究成果報告書概要(和文)」より
