Production of sterile hybrid mackerel population utilizing a mechanism of reproductive isolation between two related species.

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H03030
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 40030:Aquatic bioproduction science-related
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: Yazawa Ryosuke 東京海洋大学, 学術研究院, 准教授 (70625863)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 雑種不妊 / 生殖隔離 / サバ養殖

Outline of Final Research Achievements

In this project, in view of the existence of a population in which reproductive isolation is established, using this mechanism, it was attempted to produce a population of mackerel hybrids in which all individuals are sterile. In order to find a possible combination of completely sterile populations, crossbreeding was conducted between the chub mackerel and blue Mackerel stocks in various regions of Japan. However, the results indicated that the attempts to crossbreed sympatric populations of chub mackerel and sesame mackerel did not result in a completely sterile population. These results suggest that the production of a completely sterile population depends on combinations at the individual level, not on combinations of stock groups. The results also suggest that even if the fish are sterile at an early stage, they may eventually recover their gametogenic potential on mature fish.

Free Research Field

魚類生殖工学

Academic Significance and Societal Importance of the Research Achievements

本課題では、マサバとゴマサバのF１交雑魚が不妊となるメカニズムおよびそれを利用した全個体不妊化サバ集団の作出を試みた。本課題中では、完全な不妊化集団を確実に作出する両親種の組み合わせを見出すには至らなかった。しかし、本課題を進める中で、F１サバ交雑魚の不妊化に関する知見が集積された。さらに、両種のサバのゲノム情報が蓄積され、２種間で性決定機構が異なることや、これらの情報を用いた性判定技術の開発も実現した。これらの情報や技術は、現在盛んになりつつある、人工種苗を用いたサバ類養殖の発展にも大きく貢献するものである。