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Japanese scientists use new technology to make salmon salmon out of rainbow trout
There is nothing more surprising than that of a father: A male salmon has a lot of rainbow trout offspring and is indeed born - these rainbow trout are extracted from salmon. The sperm is nurtured. Japanese scientists say their results are expected to be used to develop fisheries and even to protect rare species. Yoshizaki Goro, a scientist at Tokyo Ocean University in Japan, reported in the British magazine Nature on August 5, 2004 that they had produced male salmon salmon to produce rainbow trout sperm, using these sperm to make rainbow trout The eggs were fertilized and a healthy rainbow trout was cultivated. Masu salmon and rainbow trout are two closely related species, but they differentiated from their common ancestors 8 million years ago and embarked on a different evolutionary path. And the former lives in Asia and the latter lives in North America. It is impossible for them to hybridize and produce offspring under natural conditions. The key to the new achievements of Japanese scientists is the use of animal primordial germ cells (PGCs), which are found in embryos and can either develop into sperm or develop into eggs. The scientists extracted the primordial germ cells of rainbow trout and implanted young male Masu salmon. When adult salmon are grown, they fertilize rainbow trout eggs with their sperm. As a result, 0.4% of the small fish developed from fertilized eggs were healthy and normal rainbow trout, indicating that the primordial germ cells of rainbow trout developed rainbow trout spermatozoa in salmon. Other small fish died early, showing that they are hybrids of common salmon salmon sperm and rainbow trout fish eggs. This is the first time that humans have used an organism's primordial germ cells to produce healthy offspring through surrogate parents of another species. Scientists also implanted rainbow trout primordial germ cells into female salmon to see if they could develop rainbow trout roe. Since the time required for maturation of female salmon is one year longer than that of males, this issue will only be known in the next year. Yoshizaki Goro said that if the primordial germ cells can successfully develop into egg cells, it will be possible to use them to preserve rare species, and even allow extinct species to "return to life." He said that the primordial germ cells can be kept frozen forever. If the species is extinct, they can be used to regenerate extinct organisms using closely related organisms as surrogate parents. New technologies may also bring love to those who love to eat sashimi. Bluefin tuna sashimi is very popular, but adult bluefin tuna may weigh as much as 500 kilograms and is difficult to farm. Yoshizaki said that small squids are closely related to bluefin tuna. Using their new technology, it is possible to use squid to produce large amounts of small bluefin tuna and stocking them in the sea. However, some scientists say that this method is effective in other organisms, especially those more complex than fish, and further verification is needed.