animal is allowed on the u.s. food market. but critics are warning, there is no proof these fish are safe for humans or the environment at large. joining us now is sonzan, lead scientist for the nature conservancy. this is an interesting study. we have that picture that we can put up that shows people what this is, two salmon of the same age, one of them, the big one in the back there, has been modified with a gene from an eel? >> yeah, eel-like fish, called a pout. jon: they managed to put this gene into the salmon's genetic ski quence and what's it do? >> makes that salmon grow twice as fast, makes it eat voraciously and double its size. jon: obviously you're getting a bigger salmon, you know, in less time. >> right. jon: more meat. >> right. jon: what's wrong with that? >> nothing genetic, generically wrong with that. there are a couple of risks. one is environmental risk. eve been wheat -- we've been