The Japanese researchers hope to produce stocks of valuable, endangered species by injecting their germ cells into sterilised embryos from other species.
Goro Yoshizaki, a marine biologist, from the Tokyo University of Marine Science and Technology, Japan, used the method to successfully breed trout from salmon.
The embryos they produced developed into adult trout of both sexes, capable of producing either trout sperm or eggs. These were then combined to produce healthy trout offspring.
The scientists say the technique could be used to preserve threatened species if traditional methods such as reducing fishing, breeding in captivity or restoring their habitat fail.
Scientists breed trout out of salmon
JAPAN - Scientists have managed to breed trout from salmon using a new technique they hope will allow them to create tuna fish from mackerel.