2021 Fiscal Year Final Research Report
Determine the spawning mechanism and development of equipment for spawning of Bitterling, Tanakia tanago.
| Project/Area Number |
19K06093
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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 39060:Conservation of biological resources-related
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| Research Institution | Tokai University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | ミヤコタナゴ / 人工産卵基質 / 繁殖機構 / 生息域外保全 |
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| Outline of Final Research Achievements |
The Bitterling (Tanakia tanago) has a reproductive biology in which eggs are laid on the gills of live bivalves. Bivalve mollusks are needed for conservation outside of their habitat, but they are extremely difficult to keep and cannot be bred or raised for long periods of time. Bivalves cannot be bred or reproduced for long periods of time. For this reason, bivalves must be collected from the wild, but their numbers are also decreasing in the wild. Therefore, by creating an artificial spawning substrate without using bivalves and allowing them to spawn on it, the number of bitterling can reproduce and the number of bivalves does not need to be reduced. By adjusting the angle of the water flow in and out of the spawning substrate, males were also able to release sperm and fertilize the eggs in the substrate. Furthermore, we succeeded in raising the hatchlings that hatched from these eggs to fry by placing them in a growth container.
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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 |
絶滅危惧種は自然環境の著しい変化で何時絶滅してもおかしくない状況となっている．本研究では，生息域外で系統を保存するための研究の一環で，特異的な繁殖生態をもつタナゴ類を保全するための研究である．タナゴ類は二枚貝の鰓に産卵する特異的な繁殖生態を持っているが，二枚貝も自然界で数を減らしている．そこで，二枚貝を使わずタナゴ類を繁殖させるための人工的な産卵基質を作り，産卵させることで自然界の二枚貝に採集圧を欠けなくて済む．本研究ではミヤコタナゴを用いているが，研究成果を応用することでタナゴ類全体の生息域外保全に役立てることが可能である．
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