I definitely think that could give an advantage. Our good friend, Bruce Condello, when he had his farm, would hand pick the "best of the best" of his bluegills for a handful of characteristics as body condition, growth rate, and size and would keep those fish for further growth studies. Then, the "best of the best" of that original group would be kept for broodfish. Over years of genetic selection, he named them the "Condello" strain. People for miles wanted young of the year of those fish.
