Kinda of hypocritical for me to say anything based on some products I have tested. Truth is there is no proof either way. These fish are engineered to produce more of their own growth hormone and as a result grow faster.
Lets say a farmer has 6 bulls that were large and grew faster than the rest of the bulls.. He would selectively bred them with the largest cows, until all his cattle grew fast . Would that breed then be less healthy to consume?