The success of the germ cells that become eggs and sperm of bluefin tuna in the experiments to be ported to the mackerel.

Yoshizaki Prof. of Tokyo University of Marine Science and Technology was successful experiments transplanting germ cells become eggs and sperm of bluefin tuna to mackerel. Also enables the spawning to mating in summer, that is expected to fry the tuna is born. We aim to put to practical use as a technology that can provide a stable supply by farming the bluefin tuna that has been designated as an endangered species.
Kinki University succeeded in completely aquaculture to grow by hatching from an egg, grew up bluefin tuna are commercially available in some. However, tuna after it takes about five years before the egg becomes an adult, also need a large private facility for breeding a body weight of about 100 kg of parent of tuna necessary to breeding.
Saba is made possible breeding in about one year from hatching. With about 300 grams even into adulthood, it is raised a relatively even a small aquarium.
Tuna In terms of large classification enter a "mackerel family". Yoshizaki Professor et al., Were transplanted into the fry of mackerel of male and female Remove the germ cells from bluefin tuna. Porting destination fry had been treated so that it is not made in advance mackerel of sperm and eggs. Then, the transplanted germ cells enter the ovaries and testes of male female mackerel was verified that the growing alive in the body.
When mature mackerel of male make a sperm of tuna, female lays the eggs of tuna. If brought into mating, fry the tuna is born. If you can mass-produce fry of tuna, it becomes tailwind for the full farming. Through the discharge fry, it is expected also helps to increase the natural resources. Come and I want you to come to Fuyaseru the natural resources as well the supply of stable juvenile and paving the way for early commercialization.



東京海洋大学の吉崎教授らは、クロマグロの卵と精子になる生殖細胞をサバに移植する実験に成功した。今夏にも産卵して交配が可能になり、マグロの稚魚が誕生する見込みだという。絶滅危惧種に指定されたクロマグロを養殖して安定的に供給できる技術として実用化を目指す。
　近畿大学が卵からふ化させて育てる完全養殖に成功し、育ったクロマグロが一部で市販されている。ただ、マグロは卵が大人になるまでに５年ほどかかるうえ、繁殖に必要な体重約100キログラムの親のマグロを飼育する大きな専用施設も必要。
　サバはふ化から１年ほどで繁殖可能になる。大人になっても300グラムほどで、比較的小さな水槽でも育てられる。
　マグロは大きな分類でいうと「サバ科」に入る。吉崎教授らは、クロマグロから生殖細胞を取り出してサバのオスとメスの稚魚に移植した。移植先の稚魚はあらかじめサバの精子や卵を作らないように処理しておいた。その後、移植した生殖細胞がサバのオスの精巣やメスの卵巣に入り込み、体内で生きて増殖していることを確かめた。
　成熟するとサバのオスがマグロの精子を作り、メスがマグロの卵を産む。交配させれば、マグロの稚魚が生まれる。マグロの稚魚を量産できれば、完全養殖にとって追い風となる。稚魚を放流することで、天然の資源を増やすのにも役立つとみている。ぜひ、早期実用化の道を切り開いて安定的な幼魚の供給はもとより天然資源を増やせるようになって欲しいですね。