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Yes, populations often evolve, which is a good thing, as we are rapidly changing the environment in many ways.
However, farmed salmon are selected to grow fast when provided abundant food in fish farms. If many of these fish escape and move genes into wild salmon populations, they might ruin the ability of wild salmon to grow slowly, which is an important trait in organisms adapted to survive in the more food-stressed conditions usually encountered in the wild. This is an important point made in this article.
The gene pool is undergoing constant change. This is what is called evolution
Should it be at the hand of man with a fish artificially breed for traits nature has not chosen