Able to produce eggs and sperm in the body of rainbow trout, salmon and give birth to to fertilize it.

And was able to use the cells of the testes of salmon were cryopreserved, produce eggs and sperm in the body of the rainbow trout species, give birth to salmon and to fertilize it, research by Prof. Yoshizaki of Tokyo University of Marine Science and Technology team has announced.
You may be able to save towards a future resurrection frozen, the threatened species. The team has also launched, such as cryopreservation of testicular Kunimasu that was rediscovered in the West Lake (Yamanashi) after extinction Tazawa in Akita Prefecture.
When transplanted to fry the cells of the testes, sperm and egg that grows depending on the sex of the fry, part of the fish, such as salmon and trout have been found in a study of the same team. And by and we have succeeded in experimenting with the birth of the rainbow trout fry of salmon cells transplanted into the testes of rainbow trout "belly borrow".
After 54 days, the testes of salmon were cryopreserved, this time, and fry of rainbow trout previously ported to the contrary. Salmon was born to grow in the body of rainbow trout salmon eggs and sperm, and fertilize. That we have identified in rainbow trout also can be stored frozen for a long period of time.

In fish, this is it, huh? Possible. I hope you will be able to deploy applications to the resurrection of extinct species.


凍結保存したヤマメの精巣の細胞を使って、近縁種のニジマスの体内で卵子と精子を作り出し、これを受精させてヤマメを誕生させることに成功したと、東京海洋大学の吉崎教授らの研究チームが発表した。
　絶滅の恐れがある種を、将来の復活に向けて凍結保存できる可能性がある。チームは、田沢湖（秋田県）で絶滅後に西湖（山梨県）で再発見されたクニマスなどの精巣の凍結保存にも着手した。
　サケ・マス類など魚の一部では、精巣の細胞を稚魚に移植すると、その稚魚の性別に応じて卵子や精子に育つことが、同チームの研究で分かっている。そして、ニジマスの精巣の細胞をヤマメの稚魚に移植する「借り腹」によって、ニジマスを誕生させる実験にも成功していた。
　今回は、ヤマメの精巣を５４日間、凍結保存した後、以前とは逆にニジマスの稚魚に移植。ヤマメの卵子や精子がニジマスの体内で成長し、受精させるとヤマメが生まれた。長期間の凍結保存が可能なこともニジマスで確認しているという。
　魚類では、こんなことが可能なんですね。絶滅種の復活に応用展開できるようになるといいですね。