This brings up, to me, a question that is probably not very convenient. If, wild fish advocates want to argure that one to two generations in a hatchery is sufficient to alter a fishes ability to spawn, is that the same as saying changes in thier adaptability and perhaps DNA can change that fast. If so, how important are the minor differences in DNA and adapatability to a specific river system. It seems the same arguement could be made to state that an introduced fish or a stray could adapt to a new river in a very short time, making the differences found very inconsequential.