| Project/Area Number |
26252030
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Aquatic bioproduction science
|
|---|
| Research Institution | Nihon University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
足立 伸次 北海道大学, 水産科学研究院, 教授 (40231930)
金子 豊二 東京大学, 大学院農学生命科学研究科(農学部), 教授 (70221190)
坂本 崇 東京海洋大学, 学術研究院, 教授 (40313390)
朝比奈 潔 日本大学, 生物資源科学部, 教授 (10147671)
杉田 治男 日本大学, 生物資源科学部, 教授 (50139052)
黒木 真理 東京大学, 大学院農学生命科学研究科(農学部), 助教 (00568800)
大竹 二雄 東京大学, 大学院農学生命科学研究科, 教授 (20160525)
|
|---|
| Research Collaborator |
IJIRI Shigeho
WATANABE Soichi
ITOI Shiro
|
|---|
| Project Period (FY) |
2014-04-01 – 2019-03-31
|
| Project Status |
Completed (Fiscal Year 2018)
|
| Budget Amount *help |
¥39,780,000 (Direct Cost: ¥30,600,000、Indirect Cost: ¥9,180,000)
Fiscal Year 2018: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2017: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2016: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2015: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2014: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
|
|---|
| Keywords | ウナギ / 種苗生産 / 催熟 / レプトセファルス / 飼育技術 |
|---|
| Outline of Final Research Achievements |
To establish artificial mass production technique of glass eels, both applied and fundamental aspects of the problems on egg quality, larval diet, rearing system and breeding were investigated. Independent solo culture conditions for juveniles could induce natural female differentiation. Abnormal maternal mRNA localization in eggs caused low egg quality even if there is no difference in mRNA level. Feeding behavior of larva was evoked by the stimulants for taste sensing cells which were localized mainly at the lip. Expressions of taste sensing-related genes identified in this study varied in response to the developmental and nutritional status of larvae. The low viscosity of larval diet enhanced feeding and swallowing food by larvae. Breeding effect was confirmed by the individuals with high breeding values detected only in the strain of the fourth generation of artificially produced glass eels. These results would promote the seed production technique for eel aquaculture.
|
| Academic Significance and Societal Importance of the Research Achievements |
ウナギの種苗生産技術の確立のために避けて通れない卵質問題の改善，仔魚の初期餌料の開発，飼育方法の改良，優良家系の作出について，基礎・応用の両面で数多くの重要な知見が得られた．ニホンウナギの資源は近年大きく減少し，国際自然保護連合の絶滅危惧種にも指定された．今回の研究による成果は，長年待ち望まれてきた人工シラスウナギの完全養殖技術の完成を大きく加速し，天然のシラスウナギ資源に依存しない持続的なウナギ養殖への道を拓いた．
|
