Establishment of tasty fish strain using surrogate broodstock

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H00430
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 40:Forestry and forest products science, applied aquatic science, and related fields
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: Yoshizaki Goro 東京海洋大学, 学術研究院, 教授 (70281003)
• Co-Investigator(Kenkyū-buntansha): 坂本 崇 東京海洋大学, 学術研究院, 教授 (40313390) ; 矢澤 良輔 東京海洋大学, 学術研究院, 准教授 (70625863) ; 壁谷 尚樹 東京海洋大学, 学術研究院, 助教 (90758731)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 粗脂肪含量 / ニベ / 育種 / 生殖細胞 / 凍結保存

Outline of Final Research Achievements

We tested the feasibility of breeding individuals with high total lipids using the marine fish, Nibe, as a model. First, the total lipids of wild individuals were analyzed, and at the same time, the gonads of these individuals were cryopreserved in liquid nitrogen. After identifying individuals with high and low total lipids, their germ cells were transplanted into infertile recipients. They were then allowed to mature and then subjected to mating experiments. The results showed that the next generation derived from the recipients, receiving germ cells of individuals with high total lipids showed significantly higher total lipids than the next generation derived from the germ cells of individuals with low total lipids. These results indicate that fish fat content is inherited, which has been conventionally thought to be greatly affected by diet.

Free Research Field

水圏生命科学

Academic Significance and Societal Importance of the Research Achievements

従来、魚の脂の乗りは餌に大きく依存すると考えられてきたが、今回の研究で遺伝の影響も大きいことが明らかとなった。このことは、脂ののった魚を育種で生産可能であることを意味している。また、今回の研究では侵襲的な解析を行わないと評価できない表現型の育種が可能であることを明瞭に示すことができた。これにより、将来的には従来は未検討であった様々な新たな表現型に関する育種が進行することが期待される。