Question on Fish Farming

[basswipe]

I watched a PBS documentary last year that was down right scary.The disaster that can result from mixing farm raised fish with wild stocks is frightening.From what I understand its all about genetics and farm raised fish are genetically inferior and therefore are very prone to disease outside of a controlled environment and once mixed with wild stocks pass on that inferiority.One thing they made clear was the difference between farmed and hatchery fish.Hatchery fish as far as those that are going to be released into the wild as fry were fish that were bred strictly from wild fish or the progeny of wild fish.