dr. bob devlin is a scientist wit , he's involved with the science and the impact it might have on the environment>> reporter: you're telling me that these transgenic fish have been able to eat all they want, and they're the exact same egg as those wild type fish. >> brothers and sisters. >> who have been able to eat all they want. >> that's right. >> when dr. devlin first told me that these fish were the same age, i was blown away. i almost didn't believe him. i can see why this would be more economical for a would be gm salmon farmer. they get big faster in half the time. >> one, they waste almost no food. their behavior is so strong to acquired food resource there is very little waste. so for any amount of food taken in, they will grow about 15 to 20% larger. >> reporter: the haines family has been at sea for five generations. now counting their newest crew member but no matter how hard this family works they can't keep up with the world 's appetite for salmon. >> we need a million more pounds of this. >> reporter: why do we need more fish? two-thirds of the salmon caught in the united states i