It's a thing, though it didn't work. (Wiki links to more in depth sources): > An early tomato was developed that contained an antifreeze gene (afa3) from the

It's a thing, though it didn't work. (Wiki links to more in depth sources): > An early tomato was developed that contained an antifreeze gene (afa3) from the winter flounder with the aim of increasing the tomato's tolerance to frost, which became an icon in the early years of the debate over genetically modified foods, especially in relation to the perceived ethical dilemma of combining genes from different species as the tomato gained the moniker fish tomato.[18] The antifreeze protein was found to inhibit ice recrystallization in the flounder blood, but had no effect when expressed in transgenic tobacco.[19] The resulting tomato was never commercialized, possibly because the transgenic plant did not perform well in its frost-tolerance or other agronomic characteristics http://en.wikipedia.org/wiki/Genetically_modified_tomato http://en.wikipedia.org/wiki/Genetically_modified_tomato