>> in this case it is salmon that has had its dna altered and has been designed to grow bigger. and as lisa stark reports, for consumers it is food for thought. >> reporter: it looks like any other salmon. but opponents call it frankenfish and hope to keep it off your dinner plate. here's the difference. both fish are 18 months old. the larger genetically engineered aqua advantage salmon grows twice as fast as the regular salmon. >> this is the first genetically engineered animal that would be introduced to the food supply. >> reporter: atlantic salmon grows in fits and starts. scientists found that adding genetic material from a pacific salmon and an eel-like fish helps them grow round the clock. >> this fish is indistinguishable from traditional foods. >> how can you say it's indistinguishable when it clearly has a different genetic makeup? >> it tastes the same, it looks the same, the biology is exactly the same. >> reporter: fda scientists

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