They added some substances such as soybean isoflavones with the same composition as estrogen to the bait. As long as the male eel eats this feed for a long time, the estrogen in the male eel will become more and more after a long time, and eventually it will change from a male eel to a female eel.
Recently, Japan's * * * news agency released a report, which attracted the attention of netizens. In an aquaculture experimental field in Aichi Prefecture, Japan, they conducted a special experiment, that is, they were going to turn male cultured eels into female eels. This technology was developed after years of research, and they are still applying for some patents for this technology to protect their own technology. The main reason why they want to carry out this experiment locally is that the output of eels caught in some wild sea areas is getting lower and lower, and the number of eels near the Sea of Japan is also decreasing year by year, while the demand for eels in the Japanese market has not decreased, and it is increasing year by year.
Especially, the demand for female eels is increasing, so the relevant institutions in Japan have come up with the idea to turn some male eels into female eels in farms through some technical operations. However, some Japanese laws have clearly stipulated that it is not allowed to put estrogen into edible fish, but there is no restriction on soybean isoflavones, so the relevant local experimental institutions have begun to plan to feed soybean isoflavones to male eels, which is the basic composition of this material.
However, some netizens expressed their concern when they saw this news. They thought that such eels were not dare to eat themselves, and they were worried that the eels bred in this way might have certain effects on their health, so they could not pass the psychological barrier. According to this experimental field, after a period of experiments, it is found that if these cultured eels are fed with soybean isoflavones, basically after a period of feeding, more than 9% of the male eels in the farm will become females.