Although the Japanese Medicine and Medical Devices Law prohibits the administration of estrogen to edible fish, it is said that there is no problem in adding soy isoflavones. The experimental data showed that 90% of male eels were transformed into female eels after adding soybean isoflavones. The body and skin of male eels are easy to harden. Compared with males, female eels are not only large in size, but also tender in meat, so they are more popular in the market.
The reason why Japan uses new technology to denature eels is because their eels have been eaten to extinction. 70% of the eels caught in the world are eaten by the Japanese, and their history of eating eels can be traced back to 5000 years ago. At that time, people began to eat eel rice, which they thought was an indispensable food for men. Because of the great demand, people at that time began to cultivate eels artificially. People nourish delicious eels with clear springs in the mountains. Eel houses have appeared in Japanese towns since the Edo period. Even though it is expensive, eel rice has been sought after by the public, and eel business has begun to flourish in Japan.
However, the United Nations Morning Post once reported that according to several Japanese media reports, the endangered species Japanese eel fry suffered an extremely serious fish shortage this season, and the catch at home and abroad in Japan was only 1% of the same period last year. The catch of eels decreased and the output decreased, so the market demand for female eels increased. Because neither artificial breeding nor fishing can meet the market demand for female eels, Japan began to use technology.
Anyway, this is food to be imported. I hope the technology is perfect and there will be no side effects.