Abstract
Other researchers have experimented with genetic techniques for improving the quality and yield of livestock such as pigs. But for mammals the only practical route to date has been to remove a tiny fertilized egg, alter it, and reimplant it in the uterus - a painstaking business. Fish eggs, on the other hand, are large and readily accessible - deposited by the thousands in open water. As a result, researchers are making rapid progress in tweaking the genes of salmon, trout, catfish, and other farm fish. If regulatory obstacles and public unease can be overcome, researchers hope to serve up domesticated fish that, thanks to genetic engineering, will reach market weight faster than natural strains and will also be hardier - more resistant to diseases and to freezing in winter.
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